Re: [sage-devel] Re: GiNaC and Python disagree on arithmetic
On Mon, Sep 12, 2011 at 10:18 PM, Dima Pasechnik wrote: > I guess this all boils down to the point made by William - that _pow_ needs > to be integrated into the coersion framework (currently it is not). +1. Also, I should point out that I didn't make the decision myself back then; I was sitting next to William at the time and we had quite the lengthy discussion about it with some others in IRC. -- 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: GiNaC and Python disagree on arithmetic
I uniformized the behavior of 0^0 a long time ago (though I make no claim about what has happened between then and now -- just that it was uniform for a few precious minutes). The decision back then (which I still stand behind) is that while it is mathematically unjustifiable, it's Python's convention so we should stick with it. On Mon, Sep 12, 2011 at 10:28 AM, kcrisman wrote: > > > On Sep 12, 12:45 pm, Keshav Kini wrote: >> Hey Burcin, >> >> I guess that means you think that pynac should return 1 for 0^0, then? As >> opposed to making Sage throw a ValueError or something at >> Integer(0)^Integer(0) ? >> > > I think that Sage has had 0^0 return 1 for quite some time now? On > the other hand, Wolfram Alpha doesn't like it, and Maxima raises an > error. I assume the BDFL has some input on this issue. > > - kcrisman > > -- > 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: GiNaC and Python disagree on arithmetic
I guess this all boils down to the point made by William - that _pow_ needs to be integrated into the coersion framework (currently it is not). -- 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: [sage-notebook] public single cell server
Hi Jason, This is really neat and I love the way the code view is integrated. I was checking out the cell, and would suggest a version optimized for handhelds. Awesome work, Alex Juarez On Jul 29, 2011, at 2:11 PM, Jason Grout wrote: > Hi everyone, > > I'd like to announce a trial beta run of a public single cell server: > > http://sagemath.org:5467/ > > The idea is that this is a single cell that can very easily be embedded in > any webpage. This is the start of a comprehensive Sage web service as well, > and lays a piece of the ground work for a much more scalable model for doing > computations in the normal notebook. > > It's ready to be hammered by the larger community at this point. I will be > mentioning this next week at Mathfest, so please try to break it :). I think > just about any normal Sage computation should work. Please report any errors > to me. > > We've also rewritten interacts, so please especially test interacts. There > are some exciting new features for interacts in this rewrite that I can > detail later. The main focus for this testing is that current existing > interacts should work unchanged, hopefully. > > Thanks especially to Ira Hanson and Alex Kramer for doing much of the design > and implementation work (funded by Drake University and the NSF), to William > for an early version, and Fernando Perez and Robert Bradshaw for many helpful > conversations. I'm sure there are people I've missed who have contributed in > some way; please let me know if I've missed someone! > > The repository for the code is: > https://github.com/jasongrout/simple-python-db-compute. The instructions are > not quite up to date, but I'll be working on those soon. > > Thanks, > > Jason > > -- > Jason Grout -- 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: GiNaC and Python disagree on arithmetic
Here some random examples of wich I find the first one the strangest sage: CC(0)^CC(0) NaN - NaN*I sage: a=GF(7)(0) sage: a^a ... ArithmeticError: 0^0 is undefined. sage: a=Integers(7)(0) sage: a^a ... ArithmeticError: 0^0 is undefined. sage: K.=QQ[] sage: K(0)^K(0) 1 sage: K.=QQ[sqrt(2)] sage: K Number Field in sqrt2 with defining polynomial x^2 - 2 sage: K(0)^K(0) 1 -- 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: GiNaC and Python disagree on arithmetic
> sage: SR(0^0) > 1 Well, this is a red herring since 0^0 will evaluate, and SR(1) should be 1. What about CDF or other more bizarre rings? But I agree with you in principle. -- 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: GiNaC and Python disagree on arithmetic
If one puts it this way: sage: 0^0 1 sage: RDF(0)^RDF(0) #this one is the most dubious 1.0 sage: SR(0^0) 1 sage: SR(0)^SR(0) RuntimeError: power::eval(): pow(0,0) is undefined I think it's pretty clear that the error should go away unless there are very convincing technical reasons. -- 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: GiNaC and Python disagree on arithmetic
On Sep 12, 12:45 pm, Keshav Kini wrote: > Hey Burcin, > > I guess that means you think that pynac should return 1 for 0^0, then? As > opposed to making Sage throw a ValueError or something at > Integer(0)^Integer(0) ? > I think that Sage has had 0^0 return 1 for quite some time now? On the other hand, Wolfram Alpha doesn't like it, and Maxima raises an error. I assume the BDFL has some input on this issue. - kcrisman -- 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: GiNaC and Python disagree on arithmetic
Hey Burcin, I guess that means you think that pynac should return 1 for 0^0, then? As opposed to making Sage throw a ValueError or something at Integer(0)^Integer(0) ? I'll poke around :) -Keshav -- 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: Finding the exact camera position in Jmol
Just printing the camera position would be a huge help! I have been trying to figure out the same thing for a while now. -Niles p.s. Thanks Sébastian!!! On Sep 10, 2:11 pm, Jonathan wrote: > If you are doing everything through Sage, would having Jmol print the > rotation information to the web page be enough? Then the user could > do a cut and paste to use with the renderer they want. Completely > automating things would require more fiddling. > > Jonathan > > On Sep 9, 12:04 pm, Nils Bruin wrote: > > > > > > > > > On Sep 9, 6:52 am, Jonathan wrote: > > > > In theory this could be added to the javascript functions being > > > included with the update to the Jmol interface which is coming with > > > the switch to the new flask notebook, but I'm not sure this is the > > > best solution. > > > > The new interface will include the ability to download a .jmol file > > > to your computer. > > > Yes, I agree that in practice that may well be a very good solution > > for people who frequently do this and are familiar with the jmol > > toolchain. > > > In principle, sage already offers capability like this because it > > should be able to export a 3d scene as an "x3d" file (the last time I > > looked there were some things broken about it), which can be loaded in > > all kinds of software, including Blender. Quite possibly, Jmol has a > > unique place in sage because it displays 3d scenes interactively and > > does so (seemingly?) integrated in the notebook. Regardless of what > > backend one want to use in Sage to produce the final rendering, > > selecting a camera position is often done best interactively. So, if > > jmol can do that and hand the camera position back to sage, that would > > be great. It would allow seamless integration with the tachyon > > raytracer > > > This is the kind of functionality I think one *expects* to be present. > > It may be that it wouldn't actually get used and that people are quite > > happy just cutting and pasting screen shots. > > > One application would be to give a simplified scene to jmol as a > > preview, get the camera position, and then use tachyon to render the > > final picture (possibly with millions of spheres or something else > > beyond the scope of jmol). -- 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: GiNaC and Python disagree on arithmetic
Hi Keshav, On Mon, 12 Sep 2011 03:16:27 -0700 (PDT) Keshav Kini wrote: > I believe that error message is propagated from GiNaC. See line 523 > of src/ginac/power.cpp in the pynac spkg. The error message is > hard-coded and doesn't refer to python's eval() function. This should be fixed in pynac. Since you already spent the time to identify the problem, do you want to submit a patch with the fix? https://bitbucket.org/burcin/pynac/src 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: GiNaC and Python disagree on arithmetic
On 12 sep, 12:16, Keshav Kini wrote: > Hi Simon, > > I believe that error message is propagated from GiNaC. See line 523 of > src/ginac/power.cpp in the pynac spkg. The error message is hard-coded and > doesn't refer to python's eval() function. You're definitely right. > > -Keshav -- 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: ? sage/rings/finite_field_givaro.pyx
It was renamed in revision ed738932ba96 (sequential number 14045 in my tree, which I imagine should be the same for pretty much everyone else), to sage/rings/finite_rings/element_givaro.pyx , where it currently remains, just fyi. No idea why it's reappearing in your Sage, though. -Keshav Join us in #sagemath on irc.freenode.net ! -- 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: GiNaC and Python disagree on arithmetic
Hi Simon, I believe that error message is propagated from GiNaC. See line 523 of src/ginac/power.cpp in the pynac spkg. The error message is hard-coded and doesn't refer to python's eval() function. -Keshav -- 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: GiNaC and Python disagree on arithmetic
Hi Keshav,
On 12 Sep., 11:30, Keshav Kini wrote:
> RuntimeError: power::eval(): pow(0,0) is undefined
That error message is an interesting statement, because it is wrong,
even in pure Python:
>>> pow(0,0)
1
The error message mentions "eval", but it doesn't seem to be eval's
fault either:
>>> eval("pow(0,0)")
1
Sage yields the same result for pow(0,0) and eval("pow(0,0)"). So, to
the very least, the error message is misleading.
Best regards,
Simon
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[sage-devel] GiNaC and Python disagree on arithmetic
Here is a sample: sage: 0^0 1 sage: (x^x)(x=0) --- RuntimeError Traceback (most recent call last) /home/fs/ in () /opt/sage/local/lib/python2.6/site-packages/sage/symbolic/expression.so in sage.symbolic.expression.Expression.__call__ (sage/symbolic/expression.cpp:16183)() /opt/sage/local/lib/python2.6/site-packages/sage/symbolic/ring.so in sage.symbolic.ring.SymbolicRing._call_element_ (sage/symbolic/ring.cpp:6633)() /opt/sage/local/lib/python2.6/site-packages/sage/symbolic/expression.so in sage.symbolic.expression.Expression.substitute (sage/symbolic/expression.cpp:15547)() RuntimeError: power::eval(): pow(0,0) is undefined sage: What is the desirable solution? Should we make Sage say that 0^0 is undefined? Or am I misunderstanding what's going on here? -Keshav -- 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: ? sage/rings/finite_field_givaro.pyx
On 12 Sep., 11:05, leif wrote: > After rebuilding Sage (not just the library), I somehow get this file > back. > > It is empty, and according to Mercurial, it was last modified by #8220 > (but not deleted or renamed *there*). > > Any idea how or why this happens? P.S.: This is not reproducible by simply touching some spkg the Sage library depends on (I tried Symmetrica), and rebuilding with 'env SAGE_UPGRADING=yes make build'. -- 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] ? sage/rings/finite_field_givaro.pyx
After rebuilding Sage (not just the library), I somehow get this file back. It is empty, and according to Mercurial, it was last modified by #8220 (but not deleted or renamed *there*). Any idea how or why this happens? -leif -- 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: problem installing 4ti2 spkg
On Sun, Sep 11, 2011 at 8:30 PM, John H Palmieri wrote: > > > On Sunday, September 11, 2011 8:13:53 PM UTC-7, William wrote: >> >> On Sun, Sep 11, 2011 at 11:17 AM, John H Palmieri >> wrote: >> > When I log in to sage.math, I see the file >> > >> > /home/sagemath/www/packages/experimental/4ti2-20061025.spkg >> > >> > which is the wrong version. The other appropriate directories in >> > /home/sagemath/ contain the correct version of this spkg. Do we just >> > need >> > to replace this file with the correct one? >> > >> >> I'm sure that the answer is NO. See the section "New SPKGs procedure" >> in >> >> more /home/sage/www2-dev/README.TXT > > Ah, so I should copy the new file, remove the old one, and then run > "~/mirror t". Should I take care of that? That's what it sounds like. Try it, and if it doesn't work, we'll know the README.txt is wrong. 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
