[sage-devel] Re: Sorting vertices of a graph
Hi Carl, Thanks for the heads-up, its been so long since I read the Python 3 changes and that one hadn't stuck. Will do. Rob On Jul 24, 1:20 pm, Carl Witty wrote: > On Sat, Jul 24, 2010 at 11:54 AM, Rob Beezer wrote: > > So it is a verb. ;-) > > > Looks like similar comments apply to edges(). > > > I'm thinking that optionally passing in a comparison function would be > > a nice thing to add - a minor convenience, but also it would drive > > home the point that the sorting is somewhat the caller's > > responsibility in non-trivial situations (ie for not most users). > > > I'll get a ticket started soon. > > Note that Python 3 has removed the comparison function argument for > List.sort() and similar functions, in favor of a "key" argument giving > a function that transforms a list element into a sortable element. > For example, if you want to sort by string representations, currently > you could do: > > verts.sort(cmp=lambda a, b: cmp(str(a), str(b))) > > but in Python 3 you would have to do: > > verts.sort(key=str) > > The idea is to discourage inefficient programming; the Python 3 > version is better, because it calls str() on each element only once, > whereas the old version calls str() on each element O(log(N)) times. > > Our current Python also has a key= argument for sort(). > > I suggest that we should follow Python 3 here for such APIs, and > optionally pass in a key= function rather than a cmp= comparison > function. > > Carl -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: arithmetic with True and False
On Jul 24, 2:29 pm, Burcin Erocal wrote: > [...] > At Sage Days 24, I learned that Python allows the user to do arithmetic > with bools: > > In [1]: 5+True > Out[1]: 6 > [...] > Any comments? Preface: Python is my favorite language. These are just comments, no flames please. However, for the uninitiated, duck-typing does not always follow the principle of least surprise (and of course, any software system gets revised over time, so there are no silver bullet, just choices). Luckily, Python 3.X is working on giving more leeway to the programmer oh so ever slightly inclined to do a teensy tiny bit of type- checking. For example: http://www.python.org/dev/peps/pep-3119/ -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: new keywords for limit()
Hi Burcin, As Dana Ernst has now mentioned on the ticket, this an outgrowth of the professional development workshop that Jason Grout, Karl-Dieter Crisman and myself have been running this summer on Sage through the Mathematical Association of America. Dana is one of our top students. ;-) But seriously, he is interested in contributing to Sage and I've been helping him along with the process. Another one of the "students" (faculty at mostly undergraduate colleges) wondered about why these keywords were not present (I think they may be in some other of the M's, but obviously not Maple, and I can't recall exactly). So we all suggested they could be added, and Dana took the bait. So three developers thought this would be useful in their teaching. Which is not to say it shouldn't be discussed here in the open. I'm all for avoiding clutter, but also thought these keywords would be valuable (and IMHO opinion, preferable to "above" and "below" when we tend to draw the axis for the domain horizontally!). Thanks for bringing the discussion here. Rob On Jul 24, 2:30 pm, Burcin Erocal wrote: > Hi, > > Trac #9200 [1] adds new keywords from_left and from_right to the top > level limit() function. We already have above, below, minus, plus as > keywords. I wonder if a new one is necessary, and if it should be > "from_left/from_right". > > [1]http://trac.sagemath.org/sage_trac/ticket/9200 > > For reference, Maple only support 4 keywords [2], left, right, real, > complex. > > [2]http://www.maplesoft.com/support/help/Maple/view.aspx?path=limit > > IMHO, we should also try to keep the interface simple, and not clutter > things up by supporting many different ways of doing the same thing. > > Any comments? > > Cheers, > Burcin -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: arithmetic with True and False
if True means 1, then can you use 1 as a truth value in a conditional expression? In which case 0 would be false. What would 2 or 3 mean? Lisp distinguishes numbers from nil. Usually nil means false, (though in Scheme, there is another "false" value and nil means the empty list. However, anything non-nil is true. When you say "most languages" I think you are mistaken unless you count C as "most languages". RJF On Jul 24, 5:00 pm, David Kirkby wrote: > On 24 July 2010 22:29, Burcin Erocal wrote: > > > Hi, > > > At Sage Days 24, I learned that Python allows the user to do arithmetic > > with bools: > > > In [1]: 5+True > > Out[1]: 6 > > I personally don't see anything wrong with that - True has long since > been defined as 1 in most languages, and False as 0. > > I just checked Mathematica 7 > > In[1]:= 12==12 > > Out[1]= True > > In[2]:= 1+% > > Out[2]= 1 + True > > In[3]:= 1+False > > Out[3]= 1 + False > > So it handles True and False differently from integers. > > Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] arithmetic with True and False
On 24 July 2010 22:29, Burcin Erocal wrote: > Hi, > > At Sage Days 24, I learned that Python allows the user to do arithmetic > with bools: > > In [1]: 5+True > Out[1]: 6 I personally don't see anything wrong with that - True has long since been defined as 1 in most languages, and False as 0. I just checked Mathematica 7 In[1]:= 12==12 Out[1]= True In[2]:= 1+% Out[2]= 1 + True In[3]:= 1+False Out[3]= 1 + False So it handles True and False differently from integers. Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] arithmetic with True and False
On Sat, Jul 24, 2010 at 2:29 PM, Burcin Erocal wrote: > Hi, > > At Sage Days 24, I learned that Python allows the user to do arithmetic > with bools: > > In [1]: 5+True > Out[1]: 6 > > In [2]: True + False > Out[2]: 1 > > In [3]: 5+False > Out[3]: 5 > > Sage seems to follow this convention as well: > > sage: 5 + True > 6 > sage: 5. - True > 4.00 > > I can't see any use cases for this convention. I believe all these > examples should just raise a TypeError. IMHO, code relying on this > feature is very likely to be buggy. > > Apparently the symbolic ring doesn't handle things so well [1], but I'm > not decided what the "fix" should be. :) > > [1] http://trac.sagemath.org/sage_trac/ticket/9560 > > Any comments? For whatever reason, bools subclass int, sage: isinstance(True, int) True so to accept ints and reject bools, we'd have to do a lot of special casing. This is useful, for example sage: sum(is_prime(p) for p in range(100)) 25 - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] arithmetic with True and False
On Sat, Jul 24, 2010 at 2:29 PM, Burcin Erocal wrote: > Hi, > > At Sage Days 24, I learned that Python allows the user to do arithmetic > with bools: > > In [1]: 5+True > Out[1]: 6 > > In [2]: True + False > Out[2]: 1 > > In [3]: 5+False > Out[3]: 5 > > Sage seems to follow this convention as well: > > sage: 5 + True > 6 > sage: 5. - True > 4.00 > > I can't see any use cases for this convention. I believe all these > examples should just raise a TypeError. IMHO, code relying on this > feature is very likely to be buggy. > > Apparently the symbolic ring doesn't handle things so well [1], but I'm > not decided what the "fix" should be. :) > > [1] http://trac.sagemath.org/sage_trac/ticket/9560 > > Any comments? I do think that Sage symbolics should (eventually) support symbolic booleans where True maps to 1 and False maps to 0. See http://en.wikipedia.org/wiki/Iverson_bracket for use cases and prior art. However, I would slightly prefer an explicit rather than implicit conversion. Implicit: sgn(x) = (x > 0) - (x < 0) Explicit: sgn(x) = iverson(x > 0) - iverson(x < 0) So I wouldn't mind if the implicit conversions from bools to SR became an error instead. At any rate, the current behavior is definitely wrong :) Carl -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] new keywords for limit()
Hi, Trac #9200 [1] adds new keywords from_left and from_right to the top level limit() function. We already have above, below, minus, plus as keywords. I wonder if a new one is necessary, and if it should be "from_left/from_right". [1] http://trac.sagemath.org/sage_trac/ticket/9200 For reference, Maple only support 4 keywords [2], left, right, real, complex. [2] http://www.maplesoft.com/support/help/Maple/view.aspx?path=limit IMHO, we should also try to keep the interface simple, and not clutter things up by supporting many different ways of doing the same thing. Any comments? Cheers, Burcin -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] arithmetic with True and False
Hi, At Sage Days 24, I learned that Python allows the user to do arithmetic with bools: In [1]: 5+True Out[1]: 6 In [2]: True + False Out[2]: 1 In [3]: 5+False Out[3]: 5 Sage seems to follow this convention as well: sage: 5 + True 6 sage: 5. - True 4.00 I can't see any use cases for this convention. I believe all these examples should just raise a TypeError. IMHO, code relying on this feature is very likely to be buggy. Apparently the symbolic ring doesn't handle things so well [1], but I'm not decided what the "fix" should be. :) [1] http://trac.sagemath.org/sage_trac/ticket/9560 Any comments? Cheers, Burcin -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Sorting vertices of a graph
On Sat, Jul 24, 2010 at 11:54 AM, Rob Beezer wrote: > So it is a verb. ;-) > > Looks like similar comments apply to edges(). > > I'm thinking that optionally passing in a comparison function would be > a nice thing to add - a minor convenience, but also it would drive > home the point that the sorting is somewhat the caller's > responsibility in non-trivial situations (ie for not most users). > > I'll get a ticket started soon. Note that Python 3 has removed the comparison function argument for List.sort() and similar functions, in favor of a "key" argument giving a function that transforms a list element into a sortable element. For example, if you want to sort by string representations, currently you could do: verts.sort(cmp=lambda a, b: cmp(str(a), str(b))) but in Python 3 you would have to do: verts.sort(key=str) The idea is to discourage inefficient programming; the Python 3 version is better, because it calls str() on each element only once, whereas the old version calls str() on each element O(log(N)) times. Our current Python also has a key= argument for sort(). I suggest that we should follow Python 3 here for such APIs, and optionally pass in a key= function rather than a cmp= comparison function. Carl -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Python, Sage, categories
You might find this interesting... http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.110.7221&rep=rep1&type=pdf Taivalsaari, Antero "On the Notion of Inheritance" ACM Computing Surveys, Vol 28 No 3 Sept 1996 Robert Bradshaw wrote: On Sat, Jul 24, 2010 at 10:46 AM, Harald Schilly wrote: On Jul 24, 8:10 am, Robert Bradshaw wrote: We should do this as part of the tests, collect timing data on each test block (and perhaps even each line?). I don't think this would work for all lines because completing all the tests would take too long (if we want to use "timeit", each line is repeated several times) I rather suggest to add something to the doctest infrastructure, that executes those lines in timeit(..) that are tagged via "# timeit" appended to the line. e.g. sage: x = 1 sage: _ = x*x # timeit Data for these timings are collected in a key-value dictionary that is pickled into a file named after the current date+time (maybe also revision number?) ... The key should also be something useful, e.g. a 3-tuple consisting of the relative path and name to the file, the line number and the string literal of the exectued line. Based on that it should be straightforward to write some code that analyzes execution time regressions. +1 to the idea of a timeit decorator, which would be useful for microbenchmarking. I think timing whole blocks would be useful as well to make sure there's no macro regressions. Though any one datapoint isn't as useful, if everyone was consistently getting a slowdown for a given doctest, that would be an indicator that something is going on. - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Sorting vertices of a graph
So it is a verb. ;-)
Looks like similar comments apply to edges().
I'm thinking that optionally passing in a comparison function would be
a nice thing to add - a minor convenience, but also it would drive
home the point that the sorting is somewhat the caller's
responsibility in non-trivial situations (ie for not most users).
I'll get a ticket started soon.
Rob
On Jul 24, 4:27 am, Robert Miller wrote:
> I would simply add a caveat to the documentation. Most users use
> either integers for vertices, or a set of certain kinds of objects. It
> should be noted that "<" should implement a total ordering for this to
> be consistent, e.g. not just a poset. This is related to a debate
> about whether "<" should give an ordering of poset elements for
> computer science reasons (like binary search in a list) or for
> mathematicians...
>
>
>
> On Sat, Jul 24, 2010 at 9:20 AM, Rob Beezer wrote:
> > The vertices() method for graphs says the resulting list is always
> > sorted. But while you can use a variety of objects as the vertices of
> > a graph (very nice), they do not always compare cleanly (not so
> > nice). So I got bit tonight on a doctest where one vertex was an
> > integer and one was a symbolic expression. With a randomized order
> > for the tests, the results would vary.
>
> > Do we need to be more careful about the vertices() method, either in
> > action or in claims? When the documentation says the list is sorted,
> > is "sorted" a verb or an adjective?
>
> > I presume it is expecting too much that any two objects can be
> > comparable somehow?
>
> > Rob
>
> > sage: var('x')
> > x
> > sage: G=Graph({0:[x]})
> > sage: vert = G.vertices()
> > sage: vert
> > [0, x]
> > sage: sorted(vert)
> > [0, x]
> > sage: vert.reverse()
> > sage: vert
> > [x, 0]
> > sage: sorted(vert)
> > [x, 0]
> > sage: G.vertices?
> >
> > Note that the output of the vertices() function is always sorted.
> >
>
> > --
> > To post to this group, send an email to sage-devel@googlegroups.com
> > To unsubscribe from this group, send an email to
> > sage-devel+unsubscr...@googlegroups.com
> > For more options, visit this group
> > athttp://groups.google.com/group/sage-devel
> > URL:http://www.sagemath.org
>
> --
> Robert L. Millerhttp://www.rlmiller.org/
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[sage-devel] Interesting project: Assimulo
http://www.jmodelica.org/page/199 -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Python, Sage, categories
On Sat, Jul 24, 2010 at 11:21 AM, Robert Bradshaw
wrote:
> On Sat, Jul 24, 2010 at 10:46 AM, Harald Schilly
> wrote:
>> On Jul 24, 8:10 am, Robert Bradshaw
>> wrote:
>>> We should do this as part of the tests, collect timing data on each
>>> test block (and perhaps even each line?).
>>
>> I don't think this would work for all lines because completing all the
>> tests would take too long (if we want to use "timeit", each line is
>> repeated several times)
>> I rather suggest to add something to the doctest infrastructure, that
>> executes those lines in timeit(..) that are tagged via "# timeit"
>> appended to the line.
>> e.g.
>> sage: x = 1
>> sage: _ = x*x # timeit
>> Data for these timings are collected in a key-value dictionary that is
>> pickled into a file named after the current date+time (maybe also
>> revision number?) ... The key should also be something useful, e.g. a
>> 3-tuple consisting of the relative path and name to the file, the line
>> number and the string literal of the exectued line.
>> Based on that it should be straightforward to write some code that
>> analyzes execution time regressions.
>
> +1 to the idea of a timeit decorator, which would be useful for
> microbenchmarking. I think timing whole blocks would be useful as well
> to make sure there's no macro regressions. Though any one datapoint
> isn't as useful, if everyone was consistently getting a slowdown for a
> given doctest, that would be an indicator that something is going on.
>
> - Robert
In additional to all the above being good ideas, there is something
else I'm going
to start doing, which is to add a new function to sage called "timeit.test".
sage: timeit.test('some expression', 7, '2+2', ... arguments as to timeit )
True
It's a function that will return True only if the result of timing
evaluation of the expression is at most 7 times the time to evaluate
the third expression (in this case "2+2").
For example, this could be used as follows:
sage: R. = ZZ[]
sage: timeit.test('x*x', 10, '2*2')
True
to ensure that somebody doesn't screw up polynomial arithmetic so that
it suddenly takes much longer than it used to.
I'm not 100% sure that this test suite will be in Sage, but there's no
question I'm going to make it. I can always run it myself outside of
Sage if I so desire.
-- William
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Re: [sage-devel] Re: Python, Sage, categories
On Sat, Jul 24, 2010 at 10:46 AM, Harald Schilly wrote: > On Jul 24, 8:10 am, Robert Bradshaw > wrote: >> We should do this as part of the tests, collect timing data on each >> test block (and perhaps even each line?). > > I don't think this would work for all lines because completing all the > tests would take too long (if we want to use "timeit", each line is > repeated several times) > I rather suggest to add something to the doctest infrastructure, that > executes those lines in timeit(..) that are tagged via "# timeit" > appended to the line. > e.g. > sage: x = 1 > sage: _ = x*x # timeit > Data for these timings are collected in a key-value dictionary that is > pickled into a file named after the current date+time (maybe also > revision number?) ... The key should also be something useful, e.g. a > 3-tuple consisting of the relative path and name to the file, the line > number and the string literal of the exectued line. > Based on that it should be straightforward to write some code that > analyzes execution time regressions. +1 to the idea of a timeit decorator, which would be useful for microbenchmarking. I think timing whole blocks would be useful as well to make sure there's no macro regressions. Though any one datapoint isn't as useful, if everyone was consistently getting a slowdown for a given doctest, that would be an indicator that something is going on. - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Python, Sage, categories
On Jul 24, 8:10 am, Robert Bradshaw wrote: > We should do this as part of the tests, collect timing data on each > test block (and perhaps even each line?). I don't think this would work for all lines because completing all the tests would take too long (if we want to use "timeit", each line is repeated several times) I rather suggest to add something to the doctest infrastructure, that executes those lines in timeit(..) that are tagged via "# timeit" appended to the line. e.g. sage: x = 1 sage: _ = x*x # timeit Data for these timings are collected in a key-value dictionary that is pickled into a file named after the current date+time (maybe also revision number?) ... The key should also be something useful, e.g. a 3-tuple consisting of the relative path and name to the file, the line number and the string literal of the exectued line. Based on that it should be straightforward to write some code that analyzes execution time regressions. H -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Error compiling Sage 4.5.1 in OpenSuse 11.3
Install the system-wide readline-dev package for your linux distro. William 2010/7/24 Jae : > Hi, > > I did >rm (SAGE_ROOT)/local/lib/*readline* > but still get the following error. > > > Machine: Linux linux-zvbz.site 2.6.34-12-desktop #1 SMP PREEMPT > 2010-06-29 02:39:08 +0200 x86_64 x86_64 x86_64 GNU/Linux > = > . > = > checking for dlopen in -ldl... yes > checking readline/history.h usability... yes > checking readline/history.h presence... yes > checking for readline/history.h... yes > checking readline/readline.h usability... yes > checking readline/readline.h presence... yes > checking for readline/readline.h... yes > checking for rl_callback_read_char in -lreadline... no > checking for main in -lncurses... no > checking for main in -ltermcap... yes > checking for rl_callback_read_char in -lreadline... no > checking for history_truncate_file... no > configure: error: --with-readline=yes (default) and headers/libs are > not available > Error configuring R. > > real0m9.815s > user0m4.207s > sys 0m3.239s > sage: An error occurred while installing r-2.10.1.p2 > Please email sage-devel http://groups.google.com/group/sage-devel > explaining the problem and send the relevant part of > of /home/champs/sage-4.5.1/install.log. Describe your computer, > operating system, etc. > If you want to try to fix the problem yourself, *don't* just cd to > /home/champs/sage-4.5.1/spkg/build/r-2.10.1.p2 and type 'make check' > or whatever is appropriate. > Instead, the following commands setup all environment variables > correctly and load a subshell for you to debug the error: > (cd '/home/champs/sage-4.5.1/spkg/build/r-2.10.1.p2' && '/home/champs/ > sage-4.5.1/sage' -sh) > When you are done debugging, you can type "exit" to leave the > subshell. > make[1]: *** [installed/r-2.10.1.p2] Error 1 > make[1]: Leaving directory `/home/champs/sage-4.5.1/spkg' > > real0m16.363s > user0m10.554s > sys 0m3.748s > Error building Sage. > > > Thank you for your attentions > Jae > > On 7월24일, 오전8시28분, Shing wrote: >> Hi, >>After >> rm (SAGE_ROOT)/local/lib/*readline* >> >>sage compiles successfully in Opensue 11.3. >> >> Thanks! >> Shing >> >> On Jul 23, 9:06 pm, William Stein wrote: >> >> > On Fri, Jul 23, 2010 at 12:52 PM, Shing wrote: >> > > Hi, >> > > When I compile Sage 4.5.1 in Opensue 11.3, I get the following >> > > error. >> > > My cpu is an AMD Athlon 1700XP. >> >> > I think this is due to an incompatibility between your systemwide >> > readline and the one included in sage.You might try >> > cd SAGE_ROOT >> > rm local/lib/*readline* >> >> > > Machine: >> > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 >> > > athlon i386 GNU/Linux >> > > Deleting directories from past builds of previous/current versions of >> > > sqlite-3.6.22 >> > > Extracting package /usr/local/lib/sages/sage-4.5.1/spkg/standard/ >> > > sqlite-3.6.22.spkg ... >> > > -rw-r--r-- 1 1060 1060 1080534 2010-06-28 17:36 /usr/local/lib/sages/ >> > > sage-4.5.1/spkg/standard/sqlite-3.6.22.spkg >> > > sqlite-3.6.22/ >> > > sqlite-3.6.22/SPKG.txt >> > > sqlite-3.6.22/.hg/ >> > > sqlite-3.6.22/.hg/00changelog.i >> > > sqlite-3.6.22/.hg/requires >> > > sqlite-3.6.22/.hg/undo.dirstate >> > > sqlite-3.6.22/.hg/store/ >> > > sqlite-3.6.22/.hg/store/00changelog.i >> > > sqlite-3.6.22/.hg/store/00manifest.i >> > > sqlite-3.6.22/.hg/store/data/ >> > > sqlite-3.6.22/.hg/store/data/_s_p_k_g.txt.i >> > > sqlite-3.6.22/.hg/store/data/spkg-install.i >> > > sqlite-3.6.22/.hg/store/data/.hgignore.i >> > > sqlite-3.6.22/.hg/store/data/patches/ >> > > sqlite-3.6.22/.hg/store/data/patches/_makefile.in.i >> > > sqlite-3.6.22/.hg/store/undo >> > > sqlite-3.6.22/.hg/attic/ >> > > sqlite-3.6.22/.hg/dirstate >> > > sqlite-3.6.22/.hg/undo.branch >> > > sqlite-3.6.22/src/ >> > > sqlite-3.6.22/src/depcomp >> > > sqlite-3.6.22/src/sqlite3.pc >> > > sqlite-3.6.22/src/aclocal.m4 >> > > sqlite-3.6.22/src/README >> > > sqlite-3.6.22/src/ltmain.sh >> > > sqlite-3.6.22/src/configure >> > > sqlite-3.6.22/src/shell.c >> > > sqlite-3.6.22/src/configure.ac >> > > sqlite-3.6.22/src/config.guess >> > > sqlite-3.6.22/src/install-sh >> > > sqlite-3.6.22/src/config.sub >> > > sqlite-3.6.22/src/missing >> > > sqlite-3.6.22/src/sqlite3.1 >> > > sqlite-3.6.22/src/sqlite3.c >> > > sqlite-3.6.22/src/sqlite3.h >> > > sqlite-3.6.22/src/Makefile.am >> > > sqlite-3.6.22/src/Makefile.in >> > > sqlite-3.6.22/src/sqlite3ext.h >> > > sqlite-3.6.22/src/INSTALL >> > > sqlite-3.6.22/src/sqlite3.pc.in >> > > sqlite-3.6.22/patches/ >> > > sqlite-3.6.22/spkg-install >> > > sqlite-3.6.22/.hgignore >> > > Finished extraction >> > > >> > > Host system >> > > uname -a: >> > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 >> > > athlon i386 GNU/Linux >> > > >> > > **
Re: [sage-devel] Re: Error compiling Sage 4.5.1 in OpenSuse 11.3
On 07/24/10 05:58 PM, Jae wrote: Hi, I did rm (SAGE_ROOT)/local/lib/*readline* but still get the following error. Try copying the following to the directory sage-4.5.1/spkg/standard http://boxen.math.washington.edu/home/kirkby/patches/readline-6.1.spkg It is the latest readline. I removed all the Sage patches, and anything else. I have not checked it on any Linux system, OS X system. All I did was a very quick check on an OpenSolaris system. It seems to build ok. Give it a try Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Error compiling Sage 4.5.1 in OpenSuse 11.3
Hi, I did rm (SAGE_ROOT)/local/lib/*readline* but still get the following error. Machine: Linux linux-zvbz.site 2.6.34-12-desktop #1 SMP PREEMPT 2010-06-29 02:39:08 +0200 x86_64 x86_64 x86_64 GNU/Linux = . = checking for dlopen in -ldl... yes checking readline/history.h usability... yes checking readline/history.h presence... yes checking for readline/history.h... yes checking readline/readline.h usability... yes checking readline/readline.h presence... yes checking for readline/readline.h... yes checking for rl_callback_read_char in -lreadline... no checking for main in -lncurses... no checking for main in -ltermcap... yes checking for rl_callback_read_char in -lreadline... no checking for history_truncate_file... no configure: error: --with-readline=yes (default) and headers/libs are not available Error configuring R. real0m9.815s user0m4.207s sys 0m3.239s sage: An error occurred while installing r-2.10.1.p2 Please email sage-devel http://groups.google.com/group/sage-devel explaining the problem and send the relevant part of of /home/champs/sage-4.5.1/install.log. Describe your computer, operating system, etc. If you want to try to fix the problem yourself, *don't* just cd to /home/champs/sage-4.5.1/spkg/build/r-2.10.1.p2 and type 'make check' or whatever is appropriate. Instead, the following commands setup all environment variables correctly and load a subshell for you to debug the error: (cd '/home/champs/sage-4.5.1/spkg/build/r-2.10.1.p2' && '/home/champs/ sage-4.5.1/sage' -sh) When you are done debugging, you can type "exit" to leave the subshell. make[1]: *** [installed/r-2.10.1.p2] Error 1 make[1]: Leaving directory `/home/champs/sage-4.5.1/spkg' real0m16.363s user0m10.554s sys 0m3.748s Error building Sage. Thank you for your attentions Jae On 7월24일, 오전8시28분, Shing wrote: > Hi, >After > rm (SAGE_ROOT)/local/lib/*readline* > >sage compiles successfully in Opensue 11.3. > > Thanks! > Shing > > On Jul 23, 9:06 pm, William Stein wrote: > > > On Fri, Jul 23, 2010 at 12:52 PM, Shing wrote: > > > Hi, > > > When I compile Sage 4.5.1 in Opensue 11.3, I get the following > > > error. > > > My cpu is an AMD Athlon 1700XP. > > > I think this is due to an incompatibility between your systemwide > > readline and the one included in sage.You might try > > cd SAGE_ROOT > > rm local/lib/*readline* > > > > Machine: > > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 > > > athlon i386 GNU/Linux > > > Deleting directories from past builds of previous/current versions of > > > sqlite-3.6.22 > > > Extracting package /usr/local/lib/sages/sage-4.5.1/spkg/standard/ > > > sqlite-3.6.22.spkg ... > > > -rw-r--r-- 1 1060 1060 1080534 2010-06-28 17:36 /usr/local/lib/sages/ > > > sage-4.5.1/spkg/standard/sqlite-3.6.22.spkg > > > sqlite-3.6.22/ > > > sqlite-3.6.22/SPKG.txt > > > sqlite-3.6.22/.hg/ > > > sqlite-3.6.22/.hg/00changelog.i > > > sqlite-3.6.22/.hg/requires > > > sqlite-3.6.22/.hg/undo.dirstate > > > sqlite-3.6.22/.hg/store/ > > > sqlite-3.6.22/.hg/store/00changelog.i > > > sqlite-3.6.22/.hg/store/00manifest.i > > > sqlite-3.6.22/.hg/store/data/ > > > sqlite-3.6.22/.hg/store/data/_s_p_k_g.txt.i > > > sqlite-3.6.22/.hg/store/data/spkg-install.i > > > sqlite-3.6.22/.hg/store/data/.hgignore.i > > > sqlite-3.6.22/.hg/store/data/patches/ > > > sqlite-3.6.22/.hg/store/data/patches/_makefile.in.i > > > sqlite-3.6.22/.hg/store/undo > > > sqlite-3.6.22/.hg/attic/ > > > sqlite-3.6.22/.hg/dirstate > > > sqlite-3.6.22/.hg/undo.branch > > > sqlite-3.6.22/src/ > > > sqlite-3.6.22/src/depcomp > > > sqlite-3.6.22/src/sqlite3.pc > > > sqlite-3.6.22/src/aclocal.m4 > > > sqlite-3.6.22/src/README > > > sqlite-3.6.22/src/ltmain.sh > > > sqlite-3.6.22/src/configure > > > sqlite-3.6.22/src/shell.c > > > sqlite-3.6.22/src/configure.ac > > > sqlite-3.6.22/src/config.guess > > > sqlite-3.6.22/src/install-sh > > > sqlite-3.6.22/src/config.sub > > > sqlite-3.6.22/src/missing > > > sqlite-3.6.22/src/sqlite3.1 > > > sqlite-3.6.22/src/sqlite3.c > > > sqlite-3.6.22/src/sqlite3.h > > > sqlite-3.6.22/src/Makefile.am > > > sqlite-3.6.22/src/Makefile.in > > > sqlite-3.6.22/src/sqlite3ext.h > > > sqlite-3.6.22/src/INSTALL > > > sqlite-3.6.22/src/sqlite3.pc.in > > > sqlite-3.6.22/patches/ > > > sqlite-3.6.22/spkg-install > > > sqlite-3.6.22/.hgignore > > > Finished extraction > > > > > > Host system > > > uname -a: > > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 > > > athlon i386 GNU/Linux > > > > > > > > > CC Version > > > gcc -v > > > Using built-in specs. > > > COLLECT_GCC=gcc > > > COLLECT_LTO_WRAPPER=/usr/lib/gcc/i586-suse-linux/4.5/lto-wrapper > > > Target: i586-suse-linux > > > Configured with: ../configure --prefix=/usr --info
Re: [sage-devel] Should there be some *good* examples on notebook?
On Sat, Jul 24, 2010 at 4:02 AM, Dr. David Kirkby wrote: > On 07/24/10 10:41 AM, Robert Bradshaw wrote: >> >> On Sat, Jul 24, 2010 at 2:24 AM, David Kirkby >> wrote: >>> >>> On 24 July 2010 09:38, Robert Bradshaw >>> wrote: > I like "Published" and "Shared" better. >>> >>> I think the issue I have with "published", which someone else in this >>> thread first mentioned months ago, is that in academic circles one >>> associates "published" with high quality. >>> >>> I can't think of any normal use of the word "published" to mean making >>> available a set of documents like this. >> >> I guess I'd say one publishes a web page, or blog, or photo album, >> etc. to share it with the world. > > But one normally does not aim to publish error messages on a web page. If I > get to a web page which shows a PHP error, it does not give one a good > impression. > > One does not normally publish out-of-focus photos, but selectively publishes > good ones. > > For one reason or another, people often publish error messages on Sage > documents. > > >>> Looking at http://www.sagenb.org/pub/ >> >> Right now I can't even get to that page :(. Clearly not what we want >> for a first impression :). > > Agreed. > >>> less than 10% of the worksheets have a rating. At that level, I don't >>> think its achieving much myself. >>> >>> Perhaps changing "Rate this" to "Please rate this" might increase the >>> percentage of people that rate worksheets. Clearly there is not much >>> interest in rating them now. >> >> Are we sorting by rating? If so, it doesn't matter if the bottom 90% >> that probably aren't even worth rating are at the bottom. The problem >> is that the random first-time-user's ugly code littered with >> tracebacks risks being the first thing anyone sees. > > Exactly. Though once you have a rating, if things get sorted by that, people > can easily make their items appear at the top. (I'm not sure if Sage lets > you rate your own documents, but even if it does not, you can easily set up > an account to do it). There is little motivation for people to make "bad" worksheets, the kind we're talking about, sort to the top. Mostly it'll be pages people are proud of. I'm all for some kind of a superuser ranking ability as well--doesn't have to be 100% peer to peer. >> The demonstrations could be good pages as well, the question is who is >> going to create the content, and ensure that it doesn't go out of >> date? > > There are good examples around on the servers. It's just hit and miss > whether you find them. > > I don't think going out of date will be a major problem. If they could form > part of a doctest, then they would be tested that they at least work. It > would be good if a 'depreciate' warning could be raised if the code is > depreciated. > > In any case, if they were in the form > > http://www.sagenb.org/demonstations/number_theory/ > http://www.sagenb.org/demonstations/numerical_methods/ > > or something like that, someone with knowledge of those areas could have a > look occasionally and flag any problems - if a new largest prime has been > found, or Goldbach's conjecture proven, the page might need an update. > > I think aging is a relatively minor problem compared to the much larger > problem of finding a large bunch of error messages. > >> - Robert >> > > Dave > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Error compiling Sage 4.5.1 in OpenSuse 11.3
Hi, After rm (SAGE_ROOT)/local/lib/*readline* sage compiles successfully in Opensue 11.3. Thanks! Shing On Jul 23, 9:06 pm, William Stein wrote: > On Fri, Jul 23, 2010 at 12:52 PM, Shing wrote: > > Hi, > > When I compile Sage 4.5.1 in Opensue 11.3, I get the following > > error. > > My cpu is an AMD Athlon 1700XP. > > I think this is due to an incompatibility between your systemwide > readline and the one included in sage. You might try > cd SAGE_ROOT > rm local/lib/*readline* > > > > > > > Machine: > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 > > athlon i386 GNU/Linux > > Deleting directories from past builds of previous/current versions of > > sqlite-3.6.22 > > Extracting package /usr/local/lib/sages/sage-4.5.1/spkg/standard/ > > sqlite-3.6.22.spkg ... > > -rw-r--r-- 1 1060 1060 1080534 2010-06-28 17:36 /usr/local/lib/sages/ > > sage-4.5.1/spkg/standard/sqlite-3.6.22.spkg > > sqlite-3.6.22/ > > sqlite-3.6.22/SPKG.txt > > sqlite-3.6.22/.hg/ > > sqlite-3.6.22/.hg/00changelog.i > > sqlite-3.6.22/.hg/requires > > sqlite-3.6.22/.hg/undo.dirstate > > sqlite-3.6.22/.hg/store/ > > sqlite-3.6.22/.hg/store/00changelog.i > > sqlite-3.6.22/.hg/store/00manifest.i > > sqlite-3.6.22/.hg/store/data/ > > sqlite-3.6.22/.hg/store/data/_s_p_k_g.txt.i > > sqlite-3.6.22/.hg/store/data/spkg-install.i > > sqlite-3.6.22/.hg/store/data/.hgignore.i > > sqlite-3.6.22/.hg/store/data/patches/ > > sqlite-3.6.22/.hg/store/data/patches/_makefile.in.i > > sqlite-3.6.22/.hg/store/undo > > sqlite-3.6.22/.hg/attic/ > > sqlite-3.6.22/.hg/dirstate > > sqlite-3.6.22/.hg/undo.branch > > sqlite-3.6.22/src/ > > sqlite-3.6.22/src/depcomp > > sqlite-3.6.22/src/sqlite3.pc > > sqlite-3.6.22/src/aclocal.m4 > > sqlite-3.6.22/src/README > > sqlite-3.6.22/src/ltmain.sh > > sqlite-3.6.22/src/configure > > sqlite-3.6.22/src/shell.c > > sqlite-3.6.22/src/configure.ac > > sqlite-3.6.22/src/config.guess > > sqlite-3.6.22/src/install-sh > > sqlite-3.6.22/src/config.sub > > sqlite-3.6.22/src/missing > > sqlite-3.6.22/src/sqlite3.1 > > sqlite-3.6.22/src/sqlite3.c > > sqlite-3.6.22/src/sqlite3.h > > sqlite-3.6.22/src/Makefile.am > > sqlite-3.6.22/src/Makefile.in > > sqlite-3.6.22/src/sqlite3ext.h > > sqlite-3.6.22/src/INSTALL > > sqlite-3.6.22/src/sqlite3.pc.in > > sqlite-3.6.22/patches/ > > sqlite-3.6.22/spkg-install > > sqlite-3.6.22/.hgignore > > Finished extraction > > > > Host system > > uname -a: > > Linux hilbert 2.6.34-12-default #1 SMP 2010-06-29 02:39:08 +0200 i686 > > athlon i386 GNU/Linux > > > > > > CC Version > > gcc -v > > Using built-in specs. > > COLLECT_GCC=gcc > > COLLECT_LTO_WRAPPER=/usr/lib/gcc/i586-suse-linux/4.5/lto-wrapper > > Target: i586-suse-linux > > Configured with: ../configure --prefix=/usr --infodir=/usr/share/info > > --mandir=/usr/share/man --libdir=/usr/lib --libexec > > dir=/usr/lib --enable-languages=c,c++,objc,fortran,obj-c++,java,ada -- > > enable-checking=release --with-gxx-include-dir=/usr > > /include/c++/4.5 --enable-ssp --disable-libssp --disable-plugin --with- > > bugurl=http://bugs.opensuse.org/--with-pkgversion > > ='SUSE Linux' --disable-libgcj --disable-libmudflap --with-slibdir=/ > > lib --with-system-zlib --enable-__cxa_atexit --enable > > -libstdcxx-allocator=new --disable-libstdcxx-pch --enable-version- > > specific-runtime-libs --program-suffix=-4.5 --enable-li > > nux-futex --without-system-libunwind --enable-gold --with-plugin-ld=/ > > usr/bin/gold --with-arch-32=i586 --with-tune=generic > > --build=i586-suse-linux > > Thread model: posix > > gcc version 4.5.0 20100604 [gcc-4_5-branch revision 160292] (SUSE > > Linux) > > > > bash: symbol lookup error: bash: undefined symbol: > > rl_filename_rewrite_hook > > > real 0m0.015s > > user 0m0.004s > > sys 0m0.004s > > sage: An error occurred while installing sqlite-3.6.22 > > Please email sage-develhttp://groups.google.com/group/sage-devel > > explaining the problem and send the relevant part of > > of /usr/local/lib/sages/sage-4.5.1/install.log. Describe your > > computer, operating system, etc. > > If you want to try to fix the problem yourself, *don't* just cd to > > /usr/local/lib/sages/sage-4.5.1/spkg/build/sqlite-3.6.22 and type > > 'make check' or whatever is appropriate. > > Instead, the following commands setup all environment variables > > correctly and load a subshell for you to debug the error: > > (cd '/usr/local/lib/sages/sage-4.5.1/spkg/build/sqlite-3.6.22' && '/ > > usr/local/lib/sages/sage-4.5.1/sage' -sh) > > When you are done debugging, you can type "exit" to leave the > > subshell. > > make[1]: *** [installed/sqlite-3.6.22] Error 1 > > make[1]: Leaving directory `/usr/local/lib/sages/sage-4.5.1/spkg' > > > real 1m51.825s > > user 1m12.881s > > sys 0m11.
Re: [sage-devel] complementary problem
Chris, On Mon, Jul 12, 2010 at 7:49 PM, Chris Godsil wrote: > ... its the complicated vertices that are causing the problem, I expect. The problem is that the comparison operators in Python for sets implement the subset notion, and thus do not provide a proper sorting of a list of sets: http://docs.python.org/library/sets.html#set-objects IMHO, these would be better as .is_subset() methods, etc. Sage's adjacency matrix command uses vertices(), which uses comparison operators to give an ordering of the vertices. However, since "subset" does not define a total ordering, it does not give a good way of sorting vertices. One good short term solution is to use tuples instead, which are ordered lexicographically. Some possible solutions: 1. Sage graphs should have a way of specifying a user-defined comparison function for sorting vertices. Any time you use sets as vertices, you would also do something like sage: def cmp(foo, bar): ... # some total ordering on foo and bar... sage: G.set_cmp_verts(cmp) sage: G.vertices() [consistently sorted list of vertices] Or even easier: sage: G.set_cmp_verts(sets=True) 2. We could be a bit smarter and provide some alternative sort function in the vertices() command, but it would seem as if no matter which function we wrote, a user could come up with another object which would implement < etc in such a way as to still break it. Thoughts? Python gurus, is there a set object which has the right kind of __cmp__ for this use? -- Robert L. Miller http://www.rlmiller.org/ -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Sorting vertices of a graph
I would simply add a caveat to the documentation. Most users use
either integers for vertices, or a set of certain kinds of objects. It
should be noted that "<" should implement a total ordering for this to
be consistent, e.g. not just a poset. This is related to a debate
about whether "<" should give an ordering of poset elements for
computer science reasons (like binary search in a list) or for
mathematicians...
On Sat, Jul 24, 2010 at 9:20 AM, Rob Beezer wrote:
> The vertices() method for graphs says the resulting list is always
> sorted. But while you can use a variety of objects as the vertices of
> a graph (very nice), they do not always compare cleanly (not so
> nice). So I got bit tonight on a doctest where one vertex was an
> integer and one was a symbolic expression. With a randomized order
> for the tests, the results would vary.
>
> Do we need to be more careful about the vertices() method, either in
> action or in claims? When the documentation says the list is sorted,
> is "sorted" a verb or an adjective?
>
> I presume it is expecting too much that any two objects can be
> comparable somehow?
>
> Rob
>
> sage: var('x')
> x
> sage: G=Graph({0:[x]})
> sage: vert = G.vertices()
> sage: vert
> [0, x]
> sage: sorted(vert)
> [0, x]
> sage: vert.reverse()
> sage: vert
> [x, 0]
> sage: sorted(vert)
> [x, 0]
> sage: G.vertices?
>
> Note that the output of the vertices() function is always sorted.
>
>
> --
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Robert L. Miller
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Re: [sage-devel] Re: New Networkx spkg
On Fri, Jul 23, 2010 at 10:18 PM, Ben Edwards wrote: > As I am working on patching this, I wonder if we shouldn't have an API > change in sage. Currently several functions, namely cliques_number_of > take a 'with_labels' argument as a Bool to determine whether a > dictionary of values is returned or a list. In the new networkx > version, the function always returns a dictionairy, and one can access > the list of values with a call to .values(). This seems more natural > and intuitive to me, and I think we should change the sage function to > be consistent with the networkx method. Thoughts? I think we should change the API, not in order to stay consistent with the NetworkX method, but because it is better. Hopefully the NX API is more stable than it has been in the past, but it has been a moving target before. In general the Sage API is distinct from the NX one... -- Robert L. Miller http://www.rlmiller.org/ -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Should there be some *good* examples on notebook?
On 07/24/10 10:41 AM, Robert Bradshaw wrote: On Sat, Jul 24, 2010 at 2:24 AM, David Kirkby wrote: On 24 July 2010 09:38, Robert Bradshaw wrote: I like "Published" and "Shared" better. I think the issue I have with "published", which someone else in this thread first mentioned months ago, is that in academic circles one associates "published" with high quality. I can't think of any normal use of the word "published" to mean making available a set of documents like this. I guess I'd say one publishes a web page, or blog, or photo album, etc. to share it with the world. But one normally does not aim to publish error messages on a web page. If I get to a web page which shows a PHP error, it does not give one a good impression. One does not normally publish out-of-focus photos, but selectively publishes good ones. For one reason or another, people often publish error messages on Sage documents. Looking at http://www.sagenb.org/pub/ Right now I can't even get to that page :(. Clearly not what we want for a first impression :). Agreed. less than 10% of the worksheets have a rating. At that level, I don't think its achieving much myself. Perhaps changing "Rate this" to "Please rate this" might increase the percentage of people that rate worksheets. Clearly there is not much interest in rating them now. Are we sorting by rating? If so, it doesn't matter if the bottom 90% that probably aren't even worth rating are at the bottom. The problem is that the random first-time-user's ugly code littered with tracebacks risks being the first thing anyone sees. Exactly. Though once you have a rating, if things get sorted by that, people can easily make their items appear at the top. (I'm not sure if Sage lets you rate your own documents, but even if it does not, you can easily set up an account to do it). The demonstrations could be good pages as well, the question is who is going to create the content, and ensure that it doesn't go out of date? There are good examples around on the servers. It's just hit and miss whether you find them. I don't think going out of date will be a major problem. If they could form part of a doctest, then they would be tested that they at least work. It would be good if a 'depreciate' warning could be raised if the code is depreciated. In any case, if they were in the form http://www.sagenb.org/demonstations/number_theory/ http://www.sagenb.org/demonstations/numerical_methods/ or something like that, someone with knowledge of those areas could have a look occasionally and flag any problems - if a new largest prime has been found, or Goldbach's conjecture proven, the page might need an update. I think aging is a relatively minor problem compared to the much larger problem of finding a large bunch of error messages. - Robert Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] plot scale has wrongly truncated numbers
Take for example the following code:
sage: f = {0:1}
sage: for n in range(100): f[n+1] = sqrt(2.0)**f[n]
sage: line([(n,f[n]) for n in range(50,100)])
Then on the y-Axis every tick number is "2e" except the topmost is
"2".
One can not distinguish y values by their displayed numbers.
Another plot issue:
If you change the aspect ratio, then the displayed numbers (i.e. the
font) get also scaled, and makes it often unreadable.
This can be seen with this code:
sage: l=line([(1,0.5),(2,0.6)])
sage: l.set_aspect_ratio(1)
sage: l
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Re: [sage-devel] Should there be some *good* examples on notebook?
On Sat, Jul 24, 2010 at 2:24 AM, David Kirkby wrote: > On 24 July 2010 09:38, Robert Bradshaw wrote: >> On Sat, Jul 24, 2010 at 1:20 AM, David Kirkby >> wrote: > >>> http://server/demonstations/number_theory >>> http://server/demonstations/linear_algebra >>> http://server/demonstations/plotting >>> >>> in a similar way to what you suggested above with >>> >>> http://server/pub/stein >> >> Demonstrations would be a good idea. Also, we could do a "worksheet of >> the month" or something like that the same way wikipedia does a >> photo/article/etc. of the month that's deemed to be of high quality. > > That sounds a good idea > >>> 2) Rename Published -> "Globally Shared" >>> 3) Rename Shared -> "Privately Shared" >> >> I like "Published" and "Shared" better. > > I think the issue I have with "published", which someone else in this > thread first mentioned months ago, is that in academic circles one > associates "published" with high quality. > > I can't think of any normal use of the word "published" to mean making > available a set of documents like this. I guess I'd say one publishes a web page, or blog, or photo album, etc. to share it with the world. > But I don't have strong views on this. I do however have a strong view > that there should be some good examples, and that a casual observer > can not get the wrong impression by their first encounter with Sage > being a lot of junk. > >>> If someone comes along to a Sage server and sees a bunch of tracebacks >>> and other error messages, it does not exactly inspire interest. >> >> And they should ideally be tested too. I think *any* kind of rating >> system would also help the random, poor quality stuff sink to the >> bottom. >> >> - Robert > > Looking at http://www.sagenb.org/pub/ Right now I can't even get to that page :(. Clearly not what we want for a first impression :). > less than 10% of the worksheets have a rating. At that level, I don't > think its achieving much myself. > > Perhaps changing "Rate this" to "Please rate this" might increase the > percentage of people that rate worksheets. Clearly there is not much > interest in rating them now. Are we sorting by rating? If so, it doesn't matter if the bottom 90% that probably aren't even worth rating are at the bottom. The problem is that the random first-time-user's ugly code littered with tracebacks risks being the first thing anyone sees. The demonstrations could be good pages as well, the question is who is going to create the content, and ensure that it doesn't go out of date? - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Should there be some *good* examples on notebook?
On 24 July 2010 09:38, Robert Bradshaw wrote: > On Sat, Jul 24, 2010 at 1:20 AM, David Kirkby wrote: >> http://server/demonstations/number_theory >> http://server/demonstations/linear_algebra >> http://server/demonstations/plotting >> >> in a similar way to what you suggested above with >> >> http://server/pub/stein > > Demonstrations would be a good idea. Also, we could do a "worksheet of > the month" or something like that the same way wikipedia does a > photo/article/etc. of the month that's deemed to be of high quality. That sounds a good idea >> 2) Rename Published -> "Globally Shared" >> 3) Rename Shared -> "Privately Shared" > > I like "Published" and "Shared" better. I think the issue I have with "published", which someone else in this thread first mentioned months ago, is that in academic circles one associates "published" with high quality. I can't think of any normal use of the word "published" to mean making available a set of documents like this. But I don't have strong views on this. I do however have a strong view that there should be some good examples, and that a casual observer can not get the wrong impression by their first encounter with Sage being a lot of junk. >> If someone comes along to a Sage server and sees a bunch of tracebacks >> and other error messages, it does not exactly inspire interest. > > And they should ideally be tested too. I think *any* kind of rating > system would also help the random, poor quality stuff sink to the > bottom. > > - Robert Looking at http://www.sagenb.org/pub/ less than 10% of the worksheets have a rating. At that level, I don't think its achieving much myself. Perhaps changing "Rate this" to "Please rate this" might increase the percentage of people that rate worksheets. Clearly there is not much interest in rating them now. Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Python, Sage, categories
On 24 July 2010 07:13, Mike Hansen wrote: > On Fri, Jul 23, 2010 at 11:10 PM, Robert Bradshaw > wrote: >> We should do this as part of the tests, collect timing data on each >> test block (and perhaps even each line?). There have been vague plans >> to do this for a while, and I thought about waiting for it before >> getting this in, but no one's produced code. > > I think Craig may actually have some code for this. > > --Mike I created this ticket long ago, but don't know how to go about writing it myself http://trac.sagemath.org/sage_trac/ticket/6808 That was aimed at having a more direct comparison with Mathematica. I agree with Robert, doing something as part of the doctests would be useful. Clearly one would need a way to separate CPU time from wall time. If the CPU time used by a test changes a lot, it should be flagged as a possible source of problem. One could also say the same about memory usage. Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Should there be some *good* examples on notebook?
On Sat, Jul 24, 2010 at 1:20 AM, David Kirkby wrote: > On 24 July 2010 08:04, William Stein wrote: > >> The design of this "publish/share" aspect of the Sage notebook is >> nearly an exact clone of Google docs "publish/share", at least circa >> 2007. The one difference is that google docs doesn't have a way to >> browse the list of published documents -- the url's it provides for >> them are stable urls for the users to post elsewhere. > > Stable URLs seem sensible to me. > > In the context of Google, this publish/share is probably OK, as I > doubt poorly published documents would been seen by anyone as a > reflection on Google - no more than poor web sites found with Google > are seen as a poor reflection on Google. > > But with Sage it is quite different. > >> Thus we could also just make the list of published worksheet not >> browsable at all by default, with the one simple change of removing >> the "Browse published worksheets" link from the front page. >> Obviously, before doing that, we would need to find some good >> replacements for the things people do sometimes use that page for, >> which is: >> (1) go into a room full of students, and >> (2) point them at http://server/pub >> (3) have them click on the worksheets for today. >> >> A customized pub per users might work to replace this, e.g., >> >> http://server/pub/stein >> >> would list the worksheets I've selected somehow... >> >> Another solution would be to be able to easily publish bundles of >> several worksheets together. Then you just tell the students to look >> at >> >> http://sever/pub/1234 >> >> for all the workhseets for today. >> >> -- >> William Stein > > Perhaps have 3 sections. > 1) Create a new category "Demonstrations" which has high quality > demonstrations.Include those with Sage, and make them impossible to > edit directly within Sage. Nice would be URL's like > > http://server/demonstations/number_theory > http://server/demonstations/linear_algebra > http://server/demonstations/plotting > > in a similar way to what you suggested above with > > http://server/pub/stein Demonstrations would be a good idea. Also, we could do a "worksheet of the month" or something like that the same way wikipedia does a photo/article/etc. of the month that's deemed to be of high quality. > 2) Rename Published -> "Globally Shared" > 3) Rename Shared -> "Privately Shared" I like "Published" and "Shared" better. > I don't see anything particularly wrong with "Globally shared" being > publicly viewable without logging in, but as long as the front page > makes it clear these might not be good examples. > > So have the front page look like > > * Sign up for a new Sage Notebook account > > * Browse Sage demonstrations > (no login required) > > * Browse Globally Shared worksheets > (Warnings, these may be bad examples) > > If someone comes along to a Sage server and sees a bunch of tracebacks > and other error messages, it does not exactly inspire interest. And they should ideally be tested too. I think *any* kind of rating system would also help the random, poor quality stuff sink to the bottom. - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Re: Sage and Python(x,y)
On Fri, Jul 23, 2010 at 8:54 PM, Afif wrote: > In the discussion I linked to, they actually discuss how the source > wasn't easily available initially due to hosting issues-- the project > head would send it to whoever asked for it. It's still not very easy > to find (they mentioned working on that), but if you go to the mirror > link on their download page, you can find the source code. Thanks for the clarification. I've changed http://windows.sagemath.org accordingly. William > > Here's the link again, and here's the relevant part of the discussion: > > http://groups.google.com/group/pythonxy/browse_thread/thread/f1842694bf899d81/9a169cbadf2e32c7?lnk=gst&q=sage#9a169cbadf2e32c7 > > That's right, the source have not always been available online > (because of my old web hosting provider limitations) but that's not a > requirement of the GPL license. The source code must be made available > on demand, that's all and that's what I've been doing every time > someone was interesting in them (my only reluctance to send the code > was related to its very bad quality ;-) ). >>> > > Afif > > On Jul 23, 6:44 pm, William Stein wrote: >> On Fri, Jul 23, 2010 at 6:40 PM, William Stein wrote: >> > On Thu, Jul 22, 2010 at 10:05 PM, Jason Grout >> > wrote: >> >> On 7/22/10 9:53 PM, Afif Elghraoui wrote: >> >> >> I just read on their website >> >> >>> dedicated to Sage for Windows: "[...] Provide an alternative to >> >>> Enthought's EPD, Python(x,y), and ActiveState Python: 100% free and >> >>> open source, unlike any of the above systems [...]"... I wonder why >> >>> they are accusing Python(x,y) to not be 100% free and open source... >> >>> very disapointing and how outrageous! >> >> >> After looking at their website, it does seem like Python(x,y) is 100% free >> >> and open source. It seems like we should change >> >>http://windows.sagemath.org/to reflect that. >> >> > Show me how to build the binaries like "Python(x,y)-2.6.5.1.exe" >> > listed athttp://www.pythonxy.com/. >> > For at least the first 6 months or so of the Python(x,y) project, >> > there were binaries, but the code needed >> > to create them was not released. I don't know if this has changed. >> > I won't changehttp://windows.sagemath.org >> > so long as the build and distribution system of Python(x,y) remains closed. >> >> > -- William >> >> On second thought, it is probably worth at least >> changinghttp://windows.sagemath.org/to point out that at least I've given up >> completely on that project. We're instead porting to Cygwin, which >> is a very different goal than the one listed athttp://windows.sagemath.org/. >> >> -- William > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Should there be some *good* examples on notebook?
On 24 July 2010 08:04, William Stein wrote: > The design of this "publish/share" aspect of the Sage notebook is > nearly an exact clone of Google docs "publish/share", at least circa > 2007. The one difference is that google docs doesn't have a way to > browse the list of published documents -- the url's it provides for > them are stable urls for the users to post elsewhere. Stable URLs seem sensible to me. In the context of Google, this publish/share is probably OK, as I doubt poorly published documents would been seen by anyone as a reflection on Google - no more than poor web sites found with Google are seen as a poor reflection on Google. But with Sage it is quite different. > Thus we could also just make the list of published worksheet not > browsable at all by default, with the one simple change of removing > the "Browse published worksheets" link from the front page. > Obviously, before doing that, we would need to find some good > replacements for the things people do sometimes use that page for, > which is: > (1) go into a room full of students, and > (2) point them at http://server/pub > (3) have them click on the worksheets for today. > > A customized pub per users might work to replace this, e.g., > > http://server/pub/stein > > would list the worksheets I've selected somehow... > > Another solution would be to be able to easily publish bundles of > several worksheets together. Then you just tell the students to look > at > > http://sever/pub/1234 > > for all the workhseets for today. > > -- > William Stein Perhaps have 3 sections. 1) Create a new category "Demonstrations" which has high quality demonstrations.Include those with Sage, and make them impossible to edit directly within Sage. Nice would be URL's like http://server/demonstations/number_theory http://server/demonstations/linear_algebra http://server/demonstations/plotting in a similar way to what you suggested above with http://server/pub/stein 2) Rename Published -> "Globally Shared" 3) Rename Shared -> "Privately Shared" I don't see anything particularly wrong with "Globally shared" being publicly viewable without logging in, but as long as the front page makes it clear these might not be good examples. So have the front page look like * Sign up for a new Sage Notebook account * Browse Sage demonstrations (no login required) * Browse Globally Shared worksheets (Warnings, these may be bad examples) If someone comes along to a Sage server and sees a bunch of tracebacks and other error messages, it does not exactly inspire interest. Dave -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Sorting vertices of a graph
The vertices() method for graphs says the resulting list is always
sorted. But while you can use a variety of objects as the vertices of
a graph (very nice), they do not always compare cleanly (not so
nice). So I got bit tonight on a doctest where one vertex was an
integer and one was a symbolic expression. With a randomized order
for the tests, the results would vary.
Do we need to be more careful about the vertices() method, either in
action or in claims? When the documentation says the list is sorted,
is "sorted" a verb or an adjective?
I presume it is expecting too much that any two objects can be
comparable somehow?
Rob
sage: var('x')
x
sage: G=Graph({0:[x]})
sage: vert = G.vertices()
sage: vert
[0, x]
sage: sorted(vert)
[0, x]
sage: vert.reverse()
sage: vert
[x, 0]
sage: sorted(vert)
[x, 0]
sage: G.vertices?
Note that the output of the vertices() function is always sorted.
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Re: [sage-devel] Cython and callbacks. State of the art ?
On Fri, Jul 23, 2010 at 11:34 PM, Thierry Dumont wrote: > Hello, > > I am not sur to understand if cython can manage callbacks. The documentation > do not say many things about this (or I could not find it). > > I want to interface ODEs solvers, and I would like to do it with cython. > o, if I want to solve du/dt=f(t,u), I need to pass f to the solver > > solver(..., f,) > > And I think that the only way to get acceptable performances if to cythonize > all: cythonize f, and cythonize the calling sequence. > > Can we do this? Yes, Cython handle callbacks, but if your library takes C functions then the callback needs to be a C function. You can create a C function that wraps a Python function, but performance won't be the best. You could also look into using fast_float or fast_callable, which have cdef methods for evaluation that can be used in a callback but are easier to create dynamically and should be plenty fast (way faster than a pure Python function). We may already do this in some of the gsl integration stuff. - Robert -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
Re: [sage-devel] Should there be some *good* examples on notebook?
On Fri, Jul 23, 2010 at 7:21 PM, David Kirkby wrote: > On 15 July 2010 22:15, Carl Witty wrote: >> On Thu, Jul 15, 2010 at 1:27 PM, Carl Witty wrote: >>> One very simple change might be easier to implement/use. How about if >>> there were both a "share" button and a "publish" button, and these >>> went in to separate sections? I'm guessing that people asking for >>> help with an error message, etc., would be perfectly happy to choose >>> "share" rather than "publish". >> >> Of course, now that I actually look at the notebook, I see that such >> buttons already exist. Sorry for the noise. >> >> Carl > > They are different though. If you "share" a document you "share" it > with a number of people, but not the whole world. If you "publish" it, > anyone with access to the server can see it. The problem I find is > that many "published" documents are just rubbish. It does not give a > good impression to see a ton of bad examples of Sage usage published. > > I think it would be better i there were some read-only "demonstrations > of good Sage usage", like there for Mathematica. > > http://demonstrations.wolfram.com/ > > I don't see any poor examples of Mathematica usage on the Wolfram > Demonstrations pages, but we allow any old junk to be published. > Perhaps the notebook should have on the front page, something like: > > * Demonstrations (examples of good Sage usage) > * Publicly viewable documents (quality varies considerably). > > Put 100 demonstrations in the Sage distribution, and make them read-only. > > One tends to equate "published" with good quality, but in practice the > published documents can be true junk. This looks like an attempt to > spam, though it was not very effective. > > http://t2nb.math.washington.edu:8000/home/pub/20/ > The design of this "publish/share" aspect of the Sage notebook is nearly an exact clone of Google docs "publish/share", at least circa 2007. The one difference is that google docs doesn't have a way to browse the list of published documents -- the url's it provides for them are stable urls for the users to post elsewhere. Thus we could also just make the list of published worksheet not browsable at all by default, with the one simple change of removing the "Browse published worksheets" link from the front page. Obviously, before doing that, we would need to find some good replacements for the things people do sometimes use that page for, which is: (1) go into a room full of students, and (2) point them at http://server/pub (3) have them click on the worksheets for today. A customized pub per users might work to replace this, e.g., http://server/pub/stein would list the worksheets I've selected somehow... Another solution would be to be able to easily publish bundles of several worksheets together. Then you just tell the students to look at http://sever/pub/1234 for all the workhseets for today. -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
