[sage-support] Re: Strange construction in autogenerated Python
On Thu, 26 Mar 2009 at 10:24PM -0700, Timothy Clemans wrote: Instead of actually modifying Python to fix some annoyances Sage uses IPython to preparse the code. For example in Sage 4 ^ 6 is preparsed into 4 ** 6. I think he's curious about Integer() being applied twice, when once is obviously enough. I just looked at an autogenerated .py file, and I only see things like _sage_const_1 = Integer(1)...Greg, where do you have 2's in your original .sage file? Dan On Thu, Mar 26, 2009 at 9:52 PM, Greg Kuperberg greg.kuperb...@gmail.com wrote: Hi. I see that when I make file called foo.sage, sage precompiles it into another file called foo.py. The code statement in this file is: _sage_const_2 = Integer(Integer(2)) Surely this is wrong? Maybe it does not matter if this Python code is only executed once. But still it looks strange. -- --- Dan Drake dr...@kaist.edu - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] avatars.py (and others): which one ?
I need to make changes to avatars.py I find 3 versions of this script in the sage tree: ./devel/sage-main/build/lib.linux-x86_64-2.5/sage/server/notebook/avatars.py ./devel/sage-main/build/sage/server/notebook/avatars.py ./devel/sage-main/sage/server/notebook/avatars.py (the same is true for notebook.py and many other scripts). Which one is used by the notebook? I cannot find where all this is described in the documentation... can you give me a hint? Yours, t.d. - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - begin:vcard fn:Thierry Dumont n:Dumont;Thierry org;quoted-printable:CNRS - Universit=C3=A9 Lyon 1. / Villeurbanne France.;Institut Camille Jordan adr:;;43 Bd du 11 Novembre;Villeurbanne Cedex;F;69621;France email;internet:tdum...@math.univ-lyon1.fr title;quoted-printable:Ing=C3=A9nieur de Recherche/Research Ingineer tel;work:(33) 4 72 44 85 23 x-mozilla-html:FALSE url:http://math.univ-lyon1.fr/~tdumont version:2.1 end:vcard smime.p7s Description: S/MIME Cryptographic Signature
[sage-support] Re: avatars.py (and others): which one ?
./devel/sage-main/sage/server/notebook/avatars.py Usually one clones the main branch sage --clone nameofclone sage -br takes your changes live On Fri, Mar 27, 2009 at 1:25 AM, Thierry Dumont tdum...@math.univ-lyon1.fr wrote: I need to make changes to avatars.py I find 3 versions of this script in the sage tree: ./devel/sage-main/build/lib.linux-x86_64-2.5/sage/server/notebook/avatars.py ./devel/sage-main/build/sage/server/notebook/avatars.py ./devel/sage-main/sage/server/notebook/avatars.py (the same is true for notebook.py and many other scripts). Which one is used by the notebook? I cannot find where all this is described in the documentation... can you give me a hint? Yours, t.d. - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: avatars.py (and others): which one ?
Timothy Clemans a écrit : ./devel/sage-main/sage/server/notebook/avatars.py Ok thank you... Usually one clones the main branch sage --clone nameofclone sage -br takes your changes live I do not really understand this. I apologize, but is there a link to some place where it is explained? Do tou mean: sage --clone nameofclone= creates a copy the we make changes in nameofclone and sage -br tranfers the changes in the main branch ? Yours t. On Fri, Mar 27, 2009 at 1:25 AM, Thierry Dumont tdum...@math.univ-lyon1.fr wrote: I need to make changes to avatars.py I find 3 versions of this script in the sage tree: ./devel/sage-main/build/lib.linux-x86_64-2.5/sage/server/notebook/avatars.py ./devel/sage-main/build/sage/server/notebook/avatars.py ./devel/sage-main/sage/server/notebook/avatars.py (the same is true for notebook.py and many other scripts). Which one is used by the notebook? I cannot find where all this is described in the documentation... can you give me a hint? Yours, t.d. - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~--- -- - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - begin:vcard fn:Thierry Dumont n:Dumont;Thierry org;quoted-printable:CNRS - Universit=C3=A9 Lyon 1. / Villeurbanne France.;Institut Camille Jordan adr:;;43 Bd du 11 Novembre;Villeurbanne Cedex;F;69621;France email;internet:tdum...@math.univ-lyon1.fr title;quoted-printable:Ing=C3=A9nieur de Recherche/Research Ingineer tel;work:(33) 4 72 44 85 23 x-mozilla-html:FALSE url:http://math.univ-lyon1.fr/~tdumont version:2.1 end:vcard smime.p7s Description: S/MIME Cryptographic Signature
[sage-support] Re: avatars.py (and others): which one ?
On Fri, Mar 27, 2009 at 3:38 AM, Thierry Dumont tdum...@math.univ-lyon1.fr wrote: Timothy Clemans a écrit : ./devel/sage-main/sage/server/notebook/avatars.py Ok thank you... Usually one clones the main branch sage --clone nameofclone sage -br takes your changes live I do not really understand this. I apologize, but is there a link to some place where it is explained? Do tou mean: sage --clone nameofclone = creates a copy the we make changes in nameofclone and sage -br tranfers the changes in the main branch ? sage -br builds Sage using the modified code in the current clone to go back to the old code you would do sage -b main See http://sagemath.org/doc/developer/producing_patches.html Yours t. On Fri, Mar 27, 2009 at 1:25 AM, Thierry Dumont tdum...@math.univ-lyon1.fr wrote: I need to make changes to avatars.py I find 3 versions of this script in the sage tree: ./devel/sage-main/build/lib.linux-x86_64-2.5/sage/server/notebook/avatars.py ./devel/sage-main/build/sage/server/notebook/avatars.py ./devel/sage-main/sage/server/notebook/avatars.py (the same is true for notebook.py and many other scripts). Which one is used by the notebook? I cannot find where all this is described in the documentation... can you give me a hint? Yours, t.d. - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - -- - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: When absolutely must declare vars?
On Mar 26, 1:44 pm, kcrisman kcris...@gmail.com wrote: Incidentally, that is a good argument for always declaring your functions as callable; it relieves one of this tedious var business. I will make a mental note of it for intro material in Sage. That would be a good idea if it was natural to ALWAYS define callable functions. The problem is that when the first thing a student types into his/her notebook is integrate(sin(x),x,2,44) then an error will occur. That is why we make a single exception for the variable x. And I wasn't implying one should always define callable functions, I just meant it is an argument for doing so as often as possible when it is reasonable. I do not personally always like callable functions, but this is an argument for doing it fairly consistently if you're using variables other than x and you are actually defining functions, not expressions. That's it. - kcrisman --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
sage: n(a) # Why doesn't this return the result of numerical_integral? --- TypeError Traceback (most recent call last) /home/jason/.sage/temp/littleone/29880/_home_jason__sage_init_sage_0.py in module() /home/jason/sage/local/lib/python2.5/site-packages/sage/misc/functional.pyc in numerical_approx(x, prec, digits) 765 prec = int((digits+1) * 3.32192) + 1 766 try: -- 767 return x.numerical_approx(prec) 768 except AttributeError: 769 from sage.rings.complex_double import is_ComplexDoubleElement /home/jason/sage/local/lib/python2.5/site-packages/sage/calculus/calculus.p yc in numerical_approx(self, prec, digits) 1514 except TypeError: 1515 # try to return a complex result - 1516 approx = self._complex_mpfr_field_(ComplexField(prec)) Here's the problem: the only TypeError it recognizes is to try to evaluate a complex integral, but since sin(cos(x)) doesn't have an antiderivative Maxima knows about, it tries this. Maybe one (you? :) ) can implement a catch for the event that the integral does not completely resolve symbolically (e.g. try sage: integrate(1/ (1+x^8)) versus sage: integrate(1/(1+x^7)), where the first just returns the question but the second did the only piece of the partial fraction it could, yet both should probably have numerical_integral applied somehow when n() is called.) - kcrisman --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: counting iterations of a loop by evaluating a sum
That's perfect. Thanks!
On Mar 26, 5:41 pm, Jason Grout jason-s...@creativetrax.com wrote:
Burcin Erocal wrote:
Hi,
On Thu, 26 Mar 2009 09:31:09 -0700 (PDT)
Patrick patrick.j.cla...@gmail.com wrote:
I'd like to count the iterations of a loop nest by evaluating a sum.
Consider the following loop nest:
for (k = 0; k N; k++)
for (i = k+1; i N; i++)
for (j = k+1; j = i; j++)
...
I'd like to count the total number of iterations of that loop nest.
I've used mathematica a bit, and you could solve this problem with
something like this:
Sum[1, {k, 0, N}, {i, k+1, N}, {j, k+1, i-1}]
The result should be in terms of N. For this loop nest the closed
form is:
1 / 6 * (1 + N) * (N^2 - N)
I've been trying to figure out how to do this sort of problem in Sage,
but I have been unsuccessful. Any help would be greatly appreciated.
Unfortunately Sage doesn't have native code to find closed forms for
sums at the moment. You will have to use maxima directly to solve this
problem.
You can use maxima as illustrated in William's message here:
http://groups.google.com/group/sage-support/browse_thread/thread/4584...
sage: a=maxima('sum(sum(sum(1,j,k+1,i-1), i, k+1, N), k, 0, N),
simpsum').sage()
sage: a
(2*N^3 + 3*N^2 + N)/12 - (N^3 + N^2)/2 + (N^2 + N)/4 + N^2*(N + 1)/2 -
N*(N + 1)/2
sage: a.simplify_full()
(N^3 - N)/6
Jason
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[sage-support] Re: avatars.py (and others): which one ?
On Fri, Mar 27, 2009 at 1:25 AM, Thierry Dumont tdum...@math.univ-lyon1.fr wrote: I need to make changes to avatars.py I find 3 versions of this script in the sage tree: ./devel/sage-main/build/lib.linux-x86_64-2.5/sage/server/notebook/avatars.py ./devel/sage-main/build/sage/server/notebook/avatars.py ./devel/sage-main/sage/server/notebook/avatars.py Change the file ./devel/sage-main/sage/server/notebook/avatars.py then type sage -br to make it live. William (the same is true for notebook.py and many other scripts). Which one is used by the notebook? I cannot find where all this is described in the documentation... can you give me a hint? Yours, t.d. - French universities are on a permanent strike! Have a look at the International Call: http://math.univ-lyon1.fr/appel - -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
On Mar 26, 7:16 pm, Robert Bradshaw rober...@math.washington.edu wrote: def Y(t): return 2500+numerical_integral(S(u)-R(u),0,t)[0] but then it won't be a symbolic object. (It will be a Python function.) Wait. What is the difference between a symbolic object and a Python function ? Not sure whey the def way works but not the Y(t) = ... way. cs --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Apache configure
I have compiled and installed sage on a server and it is working fine. To access the server from home, I have to go through a firewall and so I need to use port 80 to access the server and so far as I can tell, use mod_proxy to redirect requests to sage to port 8000. Unfortunately, in sage the html links are all absolute rather tha relative so I can redirect http://myserver/sage to port 8000 but the the links go to http://myserver/login (say) rather than http://myserver/sage/login. Any ideas, is a rewrite fo the html a huge job from me to undertake? Brian --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
On Mar 27, 2009, at 10:36 AM, cseber...@gmail.com wrote: On Mar 26, 7:16 pm, Robert Bradshaw rober...@math.washington.edu wrote: def Y(t): return 2500+numerical_integral(S(u)-R(u),0,t)[0] but then it won't be a symbolic object. (It will be a Python function.) Wait. What is the difference between a symbolic object and a Python function ? A symbolic object can be manipulated, reasoned about, and has a bunch of methods attached. sage: f(x) = x^3-x sage: f + 1 x |-- x^3 - x + 1 sage: f.integrate(x) x |-- x^4/4 - x^2/2 ... A Python function can just be called (pretty much). It's just a chunk of executable code (for example, could include loops, branching, look stuff up in a file/online, etc.). sage: def f(x): x^3-x : sage: f.integrate() Traceback (most recent call last): File ipython console, line 1, in module AttributeError: 'function' object has no attribute 'integrate' Not sure whey the def way works but not the Y(t) = ... way. The body of a function is not executed until it is called. In the latter case, when you call Y(3) the t is specialized at 3 and the numerical integration actually can evaluate at a given point. - Robert --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Apache configure
On Mar 27, 2009, at 12:00 PM, nerak99 wrote: I have compiled and installed sage on a server and it is working fine. To access the server from home, I have to go through a firewall and so I need to use port 80 to access the server and so far as I can tell, use mod_proxy to redirect requests to sage to port 8000. Unfortunately, in sage the html links are all absolute rather tha relative so I can redirect http://myserver/sage to port 8000 but the the links go to http://myserver/login (say) rather than http:// myserver/sage/login. Any ideas, is a rewrite fo the html a huge job from me to undertake? I think you can use apache to be a proxy and reverse proxy, using re- write rules to map the urls both directions (as well as ports). This is probably the best bet (correct me if I'm wrong, but doesn't sagenb.org work this way?). - Robert --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Apache configure
On Fri, Mar 27, 2009 at 12:35 PM, Robert Bradshaw rober...@math.washington.edu wrote: On Mar 27, 2009, at 12:00 PM, nerak99 wrote: I have compiled and installed sage on a server and it is working fine. To access the server from home, I have to go through a firewall and so I need to use port 80 to access the server and so far as I can tell, use mod_proxy to redirect requests to sage to port 8000. Unfortunately, in sage the html links are all absolute rather tha relative so I can redirect http://myserver/sage to port 8000 but the the links go to http://myserver/login (say) rather than http:// myserver/sage/login. Any ideas, is a rewrite fo the html a huge job from me to undertake? I think you can use apache to be a proxy and reverse proxy, using re- write rules to map the urls both directions (as well as ports). This is probably the best bet (correct me if I'm wrong, but doesn't sagenb.org work this way?). This is how sagenb.org works. This is in httpd.conf. It's maybe even more complicated because the computer serving the page isn't even the same computer where the notebook server is running. VirtualHost * RewriteEngine On ServerName sagenb.org ProxyPass/ http://sagenb.org:8000/ ProxyPassReverse / http://sagenb.org:8000/ DocumentRoot / Location / DefaultType text/html /Location /VirtualHost --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Strange construction in autogenerated Python
1) I am using sage 3.2.3, which was current when I installed it in January. It was convenient for me to compile it from scratch, but it then takes a long time to install. 2) Here is my sage code. The program estimates the probability of ever getting a 6-way tie if you repeatedly roll a die and count the number of times that you get each result. n = 100 s = 0. for k in xrange(1,n+1): t = float(factorial(6*k)/factorial(k)^6/6^(6*k)) s += t print k,s,float(t),t*float(k)^(2.5) c = sqrt(6.)*float(2*pi)^(-2.5) print Limit by Stirling's approx:,c tu = 2*c/3.*float(n)^(-1.5) print Tail upper bound:,tu s += tu print Total upper bound:,s print Estimate for chance ever:,s/(1.+s) --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Strange construction in autogenerated Python
Hi Greg, On 27 Mrz., 21:21, Greg Kuperberg greg.kuperb...@gmail.com wrote: 1) I am using sage 3.2.3, which was current when I installed it in January. It was convenient for me to compile it from scratch, but it then takes a long time to install. Side note: In order to change to the latest sage version, it is not needed to compile from scratch again. Just do sage -upgrade on the command line. Provided that you are connected with internet, it will retrieve the changes from sage 3.2.3 to the latest version and re- compile (only) the necessary bits. So, this is much faster than compiling from scratch. Cheers, Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
On Mar 27, 6:04 am, kcrisman kcris...@gmail.com wrote: Maybe one (you? :) ) can implement a catch... At first I was interested in this change but now I'm wondering if it is best the way it is now. f(x) = defines a symbolic object as was previously mentioned. A symbolic object is for analytical results. It doesn't seem like it would make sense to add any approximation relationed functions like n(..) or numerical_integral(..) to a symbolic object. On the other hand,some may argue that it is best to let the Sage user have the freedom to add anything he/she wants to a symbolic function. I'm curious what others think. Chris --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
Chris Seberino wrote: On Mar 27, 6:04 am, kcrisman kcris...@gmail.com wrote: Maybe one (you? :) ) can implement a catch... At first I was interested in this change but now I'm wondering if it is best the way it is now. f(x) = defines a symbolic object as was previously mentioned. A symbolic object is for analytical results. It doesn't seem like it would make sense to add any approximation relationed functions like n(..) or numerical_integral(..) to a symbolic object. On the other hand,some may argue that it is best to let the Sage user have the freedom to add anything he/she wants to a symbolic function. I'm curious what others think. We already have plenty of approximation functions attached to the symbolic functions. I think it's extremely valuable. For example, it's very handy for plotting things. sage: sin(1) sin(1) sage: sin(1).numerical_approx() 0.841470984807897 In fact, the first thing n() tries is the numerical_approx() method of the object. I think all we have to do is define an integral.numerical_approx() function that returns the results of numerical_integral() Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
Jason Grout wrote: Chris Seberino wrote: On Mar 27, 6:04 am, kcrisman kcris...@gmail.com wrote: Maybe one (you? :) ) can implement a catch... At first I was interested in this change but now I'm wondering if it is best the way it is now. f(x) = defines a symbolic object as was previously mentioned. A symbolic object is for analytical results. It doesn't seem like it would make sense to add any approximation relationed functions like n(..) or numerical_integral(..) to a symbolic object. On the other hand,some may argue that it is best to let the Sage user have the freedom to add anything he/she wants to a symbolic function. I'm curious what others think. We already have plenty of approximation functions attached to the symbolic functions. I think it's extremely valuable. For example, it's very handy for plotting things. sage: sin(1) sin(1) sage: sin(1).numerical_approx() 0.841470984807897 In fact, the first thing n() tries is the numerical_approx() method of the object. I think all we have to do is define an integral.numerical_approx() function that returns the results of numerical_integral() Um, duh, that's where the TypeError occurs above. Okay, I guess I meant: one should just fix the numeric_approx function for integral... Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How use substitute method in function definitions?
On Mar 27, 6:20 pm, Jason Grout jason-s...@creativetrax.com wrote: We already have plenty of approximation functions attached to the symbolic functions. sage: sin(1).numerical_approx() Yes. I was unclear. What I meant was it wouldn't make sense to use approximation function in the *definition* of a symbolic function... e.g. f(x) = numerical_integral(...) Do people want that? Or is that easy to do? Chris --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: When absolutely must declare vars?
On Mar 27, 5:58 am, kcrisman kcris...@gmail.com wrote: And I wasn't implying one should always define callable functions, I just meant it is an argument for doing so as often as possible when it is reasonable. I do not personally always like callable functions, but this is an argument for doing it fairly consistently if you're using variables other than x and you are actually defining functions, not expressions. That's it. I'm considering var(a b c z) for students' notebook initialization and telling them to just use single letter vars just like in pencil/paper work. cs --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: When absolutely must declare vars?
Chris Seberino wrote: On Mar 27, 5:58 am, kcrisman kcris...@gmail.com wrote: And I wasn't implying one should always define callable functions, I just meant it is an argument for doing so as often as possible when it is reasonable. I do not personally always like callable functions, but this is an argument for doing it fairly consistently if you're using variables other than x and you are actually defining functions, not expressions. That's it. I'm considering var(a b c z) for students' notebook initialization and telling them to just use single letter vars just like in pencil/paper work. Actually, this is how Sage used to be. Now, you can just do: sage: from sage.calculus.predefined import * sage: type(b) class 'sage.calculus.calculus.SymbolicVariable' sage: type(B) class 'sage.calculus.calculus.SymbolicVariable' to automatically define all single lowercase and uppercase letters as variables. However, it might be good for students to see the var() function, like you proposed. Then it would be easy for them to extrapolate how to create a variable theta, for example. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Strange construction in autogenerated Python
On Mar 27, 1:39 pm, simon.k...@uni-jena.de wrote: Side note: In order to change to the latest sage version, it is not needed to compile from scratch again. Just do sage -upgrade on the command line. Provided that you are connected with internet, it will retrieve the changes from sage 3.2.3 to the latest version and re- compile (only) the necessary bits. So, this is much faster than compiling from scratch. That's a good suggestion. But I just did that, and it still took 90 minutes, although starting the process was trivial. On the bright side, in Sage 3.4, the Integer(Integer(n)) bug is fixed. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
