[sage-support] Re: integer linear programming in Sage?
Dear John, On Oct 8, 10:01 pm, John H Palmieri [EMAIL PROTECTED] wrote: ... This may be a silly question, but integer linear programming seems to be about maximizing some quantity relative to constraints given by a matrix equality (or inequality), where everything is happening over the integers. How does this relate to finding integer solutions to a matrix equation? Certainly I am not expert for ILP, but I did some applications of ILP in 3-dimensional topology. And in that application, ILP always was about finding non-negative integer solutions of a linear system of equalities with integer coefficients. So, nothing about maximizing. Actually this is a major building block for Wolfgang Haken's theory of normal surfaces, and thus for certain classification algorithms for a large class of closed 3-manifolds. I find myself wanting to do something similar: find *all* solutions to Ax = b, where A, x, and b have non-negative integer entries. I'm trying to figure out if the various responses here will help me. In the situation of interest to me, I know that there are only finitely many solutions, and I know one solution. In the above-mentioned application, you would have b=0, and then there are *finitely* many non-neg integer solutions (fundamental solutions) that additively generate all non-neg integer solutions. And IIRC, for finding the fundamental solutions, you need to detect the smallest integer points on the edges of the cone of non-negative solutions to the equation - so, this indeed involves optimisation. However, it seems that the problem you are interested in is classical as well, and therefore I suspect you find a solution in A. Schrijver: Theory of linear and integer programming. Wiley-Interscience, Chichester 1986. Given the various applications, it would be great to have high- performance ILP in Sage! Yours Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] problem with sagetex
I've some problem using sagetex with LaTeX. If I try: pdflatex prova.tex sage prova.sage Traceback (most recent call last): File prova.py, line 3, in module import sagetex ImportError: No module named sagetex now I'm working in my directory, but if copy /usr/share/texmf/tex/ latex/sage/sagetex.py in my directory all work. Why sage can't find sagetex.py ? --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: URGENT - Problem with installing sage on suse10.1
I install gcc-4.2.4 in /usr/local then I set LD_LIBRARY_PATH in /usr/local/lib by : LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib export LD_LIBRARY_PATH And SAGE works ! Thank you very much, Ines. On 8 oct, 21:43, Ines Abdeljaoued-TEJ [EMAIL PROTECTED] wrote: Hi ! Le Tuesday 07 October 2008 14:57:35 Michael Abshoff, vous avez écrit : On Mon, Oct 6, 2008 at 1:03 PM, Ines Abdeljaoued-TEJ [EMAIL PROTECTED] wrote: Hi ! Now I am using gcc-4.2.4 and I have to update libstdc++.SO.6... I join to this email the compressed install.log Thanks for help, Regards, Ines. Hi Ines, sorry, I was offline for a couple days. When you use the new gcc (I assume you add it to $PATH) you also need to point LD_LIBRARY_PATH to include the directory of libstdc++.so. It's ok for gcc; but how can I point LD_LIBRRY_PATH to libstdc++.so ? Regards, Ines. Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Cython editor
the gedit editor, shipped with ubuntu and most gnome-based systems, is much underrated, it is in fact a very good choice. It is highly configurable, comparable to emacs i dare say, and you use python instead of lisp to configure it ! for example i have easily added to gedit a couple of tools to look for the definition of a function in SAGE's source code, or even to complete what i'm typing. On Oct 9, 7:38 am, didier deshommes [EMAIL PROTECTED] wrote: On Thu, Oct 9, 2008 at 1:04 AM, cesarnda [EMAIL PROTECTED] wrote: do this, also vi can do that. The reason I asked this question was just to know standard editor you are using to program in cython. Maybe I could have found out about another editor. I use emacs, which has a decent pyrex/cython mode, but emacs with python-mode also works fine with writing cython/pyrex. didier --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] integer linear programming in Sage?
This may be a silly question, but integer linear programming seems to be about maximizing some quantity relative to constraints given by a matrix equality (or inequality), where everything is happening over the integers. How does this relate to finding integer solutions to a matrix equation? for example you could maximize vx with constraint Ax = b for a random vector v, and do the same for Ax = b. If a solution exists, it should be found this way. I find myself wanting to do something similar: find *all* solutions to Ax = b, where A, x, and b have non-negative integer entries. I'm trying to figure out if the various responses here will help me. In the situation of interest to me, I know that there are only finitely many solutions, and I know one solution. By rotating the vector v, you will find solutions on the convex hull of the solution set with the (very naive) algorithm above. Paul Zimmermann --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: URGENT - Problem with installing sage on suse10.1
Hi ! How can I save worksheet on .pdf ? Regards, Ines. On 9 oct, 13:24, Ines [EMAIL PROTECTED] wrote: I install gcc-4.2.4 in /usr/local then I set LD_LIBRARY_PATH in /usr/local/lib by : LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib export LD_LIBRARY_PATH And SAGE works ! Thank you very much, Ines. On 8 oct, 21:43, Ines Abdeljaoued-TEJ [EMAIL PROTECTED] wrote: Hi ! Le Tuesday 07 October 2008 14:57:35 Michael Abshoff, vous avez écrit : On Mon, Oct 6, 2008 at 1:03 PM, Ines Abdeljaoued-TEJ [EMAIL PROTECTED] wrote: Hi ! Now I am using gcc-4.2.4 and I have to update libstdc++.SO.6... I join to this email the compressed install.log Thanks for help, Regards, Ines. Hi Ines, sorry, I was offline for a couple days. When you use the new gcc (I assume you add it to $PATH) you also need to point LD_LIBRARY_PATH to include the directory of libstdc++.so. It's ok for gcc; but how can I point LD_LIBRRY_PATH to libstdc++.so ? Regards, Ines. Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Cython editor
Pierre wrote: the gedit editor, shipped with ubuntu and most gnome-based systems, is much underrated, it is in fact a very good choice. It is highly configurable, comparable to emacs i dare say, and you use python instead of lisp to configure it ! for example i have easily added to gedit a couple of tools to look for the definition of a function in SAGE's source code, or even to complete what i'm typing. Do you have these changes posted somewhere? I'd like to try it out, if possible. Thanks, Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: problem with sagetex
wiso wrote: I've some problem using sagetex with LaTeX. If I try: pdflatex prova.tex sage prova.sage Traceback (most recent call last): File prova.py, line 3, in module import sagetex ImportError: No module named sagetex now I'm working in my directory, but if copy /usr/share/texmf/tex/ latex/sage/sagetex.py in my directory all work. Why sage can't find sagetex.py ? Python can't find the sagetex.py module because it knows nothing about the tex system or its directory tree. Putting it in the current directory makes it so that python can find sagetex.py. You can also put it various other places, just like installing any python module. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: problem with sagetex
Related question: Where is the 'best' place to put the sagetex folder? I have tried a lot of variations on the various texmf folders (I seem to have an abundance of them, including a texmf-dist which is where my latex looks for things. It only seems to be looking in latex/ base/, though. - kcrisman On Oct 9, 6:30 am, Jason Grout [EMAIL PROTECTED] wrote: wiso wrote: I've some problem using sagetex with LaTeX. If I try: pdflatex prova.tex sage prova.sage Traceback (most recent call last): File prova.py, line 3, in module import sagetex ImportError: No module named sagetex now I'm working in my directory, but if copy /usr/share/texmf/tex/ latex/sage/sagetex.py in my directory all work. Why sage can't find sagetex.py ? Python can't find the sagetex.py module because it knows nothing about the tex system or its directory tree. Putting it in the current directory makes it so that python can find sagetex.py. You can also put it various other places, just like installing any python module. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: problem with sagetex
I'm using /usr/share/texmf/tex/latex/sage /usr/share/texmf is the latex root on openSuSE On 9 Ott, 17:23, kcrisman [EMAIL PROTECTED] wrote: Related question: Where is the 'best' place to put the sagetex folder? I have tried a lot of variations on the various texmf folders (I seem to have an abundance of them, including a texmf-dist which is where my latex looks for things. It only seems to be looking in latex/ base/, though. - kcrisman On Oct 9, 6:30 am, Jason Grout [EMAIL PROTECTED] wrote: wiso wrote: I've some problem using sagetex with LaTeX. If I try: pdflatex prova.tex sage prova.sage Traceback (most recent call last): File prova.py, line 3, in module import sagetex ImportError: No module named sagetex now I'm working in my directory, but if copy /usr/share/texmf/tex/ latex/sage/sagetex.py in my directory all work. Why sage can't find sagetex.py ? Python can't find the sagetex.py module because it knows nothing about the tex system or its directory tree. Putting it in the current directory makes it so that python can find sagetex.py. You can also put it various other places, just like installing any python module. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] importing SAGE scripts
Hi, I have a small library of SAGE functions. I've saved it as somefile.py. I can import it and run it in SAGE using import somefile.py somefile.read_blah() However, this works only as long as somefile.py uses only Python commands structures. If I try to define a PolynomialRing, it complains that the global name 'PolynomialRing' is not defined. How do I get around this? I tried renaming it as somefile.sage but that won't import at all. regards john perry --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: importing SAGE scripts
On Thursday 09 October 2008, john_perry_usm wrote: Hi, I have a small library of SAGE functions. I've saved it as somefile.py. I can import it and run it in SAGE using import somefile.py somefile.read_blah() However, this works only as long as somefile.py uses only Python commands structures. If I try to define a PolynomialRing, it complains that the global name 'PolynomialRing' is not defined. How do I get around this? I tried renaming it as somefile.sage but that won't import at all. try to add from sage.all import * at the top of the file. Cheers, Martin -- name: Martin Albrecht _pgp: http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0x8EF0DC99 _www: http://www.informatik.uni-bremen.de/~malb _jab: [EMAIL PROTECTED] --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: importing SAGE scripts
Aren't I embarassed. It's the FIRST LINE of the help screen. regards john perry On Oct 9, 12:27 pm, john_perry_usm [EMAIL PROTECTED] wrote: Hi, I have a small library of SAGE functions. I've saved it as somefile.py. I can import it and run it in SAGE using import somefile.py somefile.read_blah() However, this works only as long as somefile.py uses only Python commands structures. If I try to define a PolynomialRing, it complains that the global name 'PolynomialRing' is not defined. How do I get around this? I tried renaming it as somefile.sage but that won't import at all. regards john perry --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Export html cell to PDF or DVI
Does anyone know of a way in Sage to export the output of a %html cell to a pdf or dvi file? --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Cython editor
I use xcode (OS X) and emacs. Both can be configured to recognize .pyx files as Python files, and if you can configure your Eclipse plugin to do the same that would probably be ideal for you (or, even better, modify the plugin to recognize cdef methods, etc.) On Oct 8, 2008, at 10:04 PM, cesarnda wrote: yes I know, but If I use that same editor for Java or C and I want it to indent with 5 spaces when I program with those lenguage I will have to reconfigure it. In Eclipse, with the python plugin I don't have to do this, also vi can do that. The reason I asked this question was just to know standard editor you are using to program in cython. Maybe I could have found out about another editor. This question had by no mean, to ask about what is an editor, how can I configure my editor, is my editor configurable, where can I download an editor? The question was meant to find out if someone was using a plugin for an editor (like eclipse or netbeans), or there was a special editor for cython (like there are for python). It's like Eclipse and Android, I might be using netbeans as the editor for my android projects and ask google, which editor are you using to program android? and they tell me: android (obviously this is not a good example because in the web page of android and in google conferences eclipse is the chosen editor, but let's just imagine that eclipse is not). As I mention, Eclipse works pretty fine with this kind of stuff and also vi, but as I said, I just wanted to know what is the standard you are using, If you are only programming in cython or in python, then it wouldn't help, because I know I can configure my editor to indent 4 spaces, but if I want my programs in C, Java or Maxima to have 5 indents it wouldn't work. Another option might be that I use Eclipse to program all but cython, and vi to program in cython. But as I repeat (again), this question was not about editors, the question was: what do you usually use as a cython editor? which Simon King and Carlo Hamalainen answered pretty fine, I thought I have ended it with the comment about the plugin for eclipse. But I think later the question took another direction. I am very sorry if I have made you waste your time with this simple question, but as I said, it was to know about what you were using, I never asked about teaching me how to use an editor. I will try to make clearer questions the next time I post something here. On 8 oct, 20:20, Joel B. Mohler [EMAIL PROTECTED] wrote: On Wednesday 08 October 2008 06:10:16 pm cesarnda wrote: but usually they give 5 spaces instead of 4 That's not the usually that I experience. But, even if it is what your editor does, it is almost certainly configurable. -- Joel --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Speeding up the for loop
I am using sage for my calc III students. The following short code produces about 500 points on a sphere. pts=[]; number_of_points=500 for t1 in srange(0, pi, n(pi/sqrt(number_of_points))): for t2 in srange(0, 2*pi, n(2*pi/sqrt(number_of_points))): pts.append((sin(t1)*cos(t2), sin(t1)*sin(t2), cos(t1))) show(point(pts)) My question is, though, that sage takes, it seems to me, longer time to execute this than I would expect. (CPU time: 6.66 s, Wall time: 48.84 s) Am I making some stupid mistake in the above code, or sage does something unnecessary, which causes the delay? In my (naive) point of view, plotting as many as 500 points shouldn't take that long time... Thanks. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Speeding up the for loop
I think the culprit is the pi in the srange, which gets Maxima too involved (and maxima as called through sage is slow). This may improve very soon as there is some work being done to shift basic symbolic things like pi to a more python-based backend. Anyway for the moment you can avoid this by declaring your own numeric pi. The fastest I could do this without using fast_float was: pts=[]; number_of_points=500 mypi = n(pi) for t1 in srange(0, mypi, n(pi/sqrt(number_of_points))): st1 = sin(t1) ct1 = cos(t1) for t2 in srange(0, 2*mypi, n(2*pi/sqrt(number_of_points))): pts.append((st1*cos(t2), st1*sin(t2), ct1)) show(point3d(pts)) ...taking the sin(t1) and cos(t1) calc out of the inner loop helps a bit as well. That was much faster for me than your original code. I had to use point3d to plot, what version of sage are you using? Cheers, Marshall Hampton On Oct 9, 2:02 pm, Byungchul Cha [EMAIL PROTECTED] wrote: I am using sage for my calc III students. The following short code produces about 500 points on a sphere. pts=[]; number_of_points=500 for t1 in srange(0, pi, n(pi/sqrt(number_of_points))): for t2 in srange(0, 2*pi, n(2*pi/sqrt(number_of_points))): pts.append((sin(t1)*cos(t2), sin(t1)*sin(t2), cos(t1))) show(point(pts)) My question is, though, that sage takes, it seems to me, longer time to execute this than I would expect. (CPU time: 6.66 s, Wall time: 48.84 s) Am I making some stupid mistake in the above code, or sage does something unnecessary, which causes the delay? In my (naive) point of view, plotting as many as 500 points shouldn't take that long time... Thanks. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Speeding up the for loop
Marshall Hampton wrote: I think the culprit is the pi in the srange, which gets Maxima too involved (and maxima as called through sage is slow). This may improve very soon as there is some work being done to shift basic symbolic things like pi to a more python-based backend. Anyway for the moment you can avoid this by declaring your own numeric pi. The fastest I could do this without using fast_float was: pts=[]; number_of_points=500 mypi = n(pi) for t1 in srange(0, mypi, n(pi/sqrt(number_of_points))): st1 = sin(t1) ct1 = cos(t1) for t2 in srange(0, 2*mypi, n(2*pi/sqrt(number_of_points))): pts.append((st1*cos(t2), st1*sin(t2), ct1)) show(point3d(pts)) ...taking the sin(t1) and cos(t1) calc out of the inner loop helps a bit as well. That was much faster for me than your original code. Here's a version that's about 6x faster yet again by avoiding yet more calculations in the inner loop and using the python sin/cos instead of the sage sin/cos: pts=[]; number_of_points=500 twopi = 2*RR(pi) mystep = twopi/math.sqrt(number_of_points) mysin,mycos = math.sin,math.cos for t1 in srange(0, twopi/2, mystep/2): st1 = mysin(t1) ct1 = mycos(t1) for t2 in srange(0, twopi, mystep): pts.append((st1*mycos(t2), st1*mysin(t2), ct1)) Thanks, Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage server incredibly slow
On Oct 9, 1:20 pm, Maike [EMAIL PROTECTED] wrote: Hello, Hii Maike, I tried using the sage server at sagenb.org. Generally, it's great, but sometimes it's just incredibly slow. I'm having to wait about a minute for cells to be executed or worksheets to be loaded or saved sometimes. Is everyone having these problems or am I doing something wrong? Every so often Sage backs up all the data and that takes a while. William did optimize a bunch of the backup code, but there is certainly still work to do. Thanks for any help! Maike Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Using Sage with a large number of undergraduate students.
On Oct 8, 5:48 am, Pierre [EMAIL PROTECTED] wrote: Ironically pretty much everything works under Solaris now but the notebook. I think that issue is easy to fix (RAND_MAX related incidentally, is it possible to get knoboo to work on solaris instead of the notebook ? (sorry if this question is somewhat besides the point) No problem, but I think it could work. The issue right now with the notebook on Solaris is that the key generation takes forever due to sucky entropy caused by RANDMAX issues. I can fix that, but I want to make sure that I do not open a gaping security issue. Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Speeding up the for loop
Byungchul Cha wrote: I am using sage for my calc III students. The following short code produces about 500 points on a sphere. pts=[]; number_of_points=500 for t1 in srange(0, pi, n(pi/sqrt(number_of_points))): for t2 in srange(0, 2*pi, n(2*pi/sqrt(number_of_points))): pts.append((sin(t1)*cos(t2), sin(t1)*sin(t2), cos(t1))) show(point(pts)) My question is, though, that sage takes, it seems to me, longer time to execute this than I would expect. (CPU time: 6.66 s, Wall time: 48.84 s) Am I making some stupid mistake in the above code, or sage does something unnecessary, which causes the delay? In my (naive) point of view, plotting as many as 500 points shouldn't take that long time... Thanks. Try putting from math import sin, cos before the rest of your code to use the double precision C-library's sin and cosine functions instead. William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Using Sage with a large number of undergraduate students.
mabshoff wrote: On Oct 8, 5:48 am, Pierre [EMAIL PROTECTED] wrote: Ironically pretty much everything works under Solaris now but the notebook. I think that issue is easy to fix (RAND_MAX related incidentally, is it possible to get knoboo to work on solaris instead of the notebook ? (sorry if this question is somewhat besides the point) No problem, but I think it could work. The issue right now with the notebook on Solaris is that the key generation takes forever due to sucky entropy caused by RANDMAX issues. I can fix that, but I want to make sure that I do not open a gaping security issue. The way we used to fix this before GNUtls stopped totally sucking at generating keys, was we used openssl to generate keys if it was installed on the system, and if not only then fell back to using GNUtls. -- William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage server incredibly slow
mabshoff wrote: On Oct 9, 1:20 pm, Maike [EMAIL PROTECTED] wrote: Hello, Hii Maike, I tried using the sage server at sagenb.org. Generally, it's great, but sometimes it's just incredibly slow. I'm having to wait about a minute for cells to be executed or worksheets to be loaded or saved sometimes. Is everyone having these problems or am I doing something wrong? Every so often Sage backs up all the data and that takes a while. William did optimize a bunch of the backup code, but there is certainly still work to do. There is substantial work to be done, because sagenb.org just gets *hammered*. In the last few weeks almost 1000 separate people opened new accounts, and people view hundreds of the interactive documentation/help pages every day. You might want to try one of the alternative servers: https://sage.math.washington.edu:8102 https://sage.math.washington.edu:8103 as those get a lot less traffic. William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: problem with sagetex
On Thu, 09 Oct 2008 at 08:23AM -0700, kcrisman wrote: Related question: Where is the 'best' place to put the sagetex folder? I have tried a lot of variations on the various texmf folders (I seem to have an abundance of them, including a texmf-dist which is where my latex looks for things. It only seems to be looking in latex/ base/, though. SageTeX has two parts: a TeX part and a Python/Sage part. Both TeX and Sage need to find the correct file. TeX and Python look in totally different places for files, so to use SageTeX you must simultaneously please both systems. On Unixy systems, I think it's common for TeX distributions (well...TeXLive at any rate) to look in your home directory for a texmf/ tree. If you put files there, I *think* they'll be found automatically...I also do texhash $HOME/texmf which creates an ls-R file; then certainly the files will be found. Inside the texmf directory, I have a typical TeX directory tree hierarchy; I don't know if that's necessary. now I'm working in my directory, but if copy /usr/share/texmf/tex/ latex/sage/sagetex.py in my directory all work. Why sage can't find sagetex.py ? That might be because the ls-R files haven't been updated. Running `texhash' as root with the proper options should fix that, although I would avoid dropping single files into such directories; they're likely to be overwritten during an upgrade. I've tried to include logic in SageTeX so that things are automatically found, but haven't found anything satisfactory yet. Dan -- --- Dan Drake [EMAIL PROTECTED] - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] Re: Speeding up the for loop
Thanks for all of your help. I did 1. Importing sin and cos using from math import sin, cos 2. Removing pi and sqrt out of the loops, following Jason's suggestion: twopi = 2*n(pi); mystep = twopi/n(sqrt(number_of_points)) and I got CPU time: 0.21 s, Wall time: 0.25 s. This looks much reasonable. Again, thanks for everyone's help. BTW, I'm using the latest version of sage and both point and point3d work for me. On Oct 9, 6:13 pm, William Stein [EMAIL PROTECTED] wrote: Byungchul Cha wrote: I am using sage for my calc III students. The following short code produces about 500 points on a sphere. pts=[]; number_of_points=500 for t1 in srange(0, pi, n(pi/sqrt(number_of_points))): for t2 in srange(0, 2*pi, n(2*pi/sqrt(number_of_points))): pts.append((sin(t1)*cos(t2), sin(t1)*sin(t2), cos(t1))) show(point(pts)) My question is, though, that sage takes, it seems to me, longer time to execute this than I would expect. (CPU time: 6.66 s, Wall time: 48.84 s) Am I making some stupid mistake in the above code, or sage does something unnecessary, which causes the delay? In my (naive) point of view, plotting as many as 500 points shouldn't take that long time... Thanks. Try putting from math import sin, cos before the rest of your code to use the double precision C-library's sin and cosine functions instead. William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
