[sage-support] Using Sage with a large number of undergraduate students.
I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I can add to Sage an identification on the ldap server (actually active directory) of the University, and Sage accounts will be created automatically. The more difficult question for us is: which machine? One can expect to have about 200 students using Sage at the same time, with large subgroups of students doing the same thing at the same time. Ok, as it is undergraduate students, they will not make very large computations... But what about the scalability of Sage, of the web server? We are currently looking at machines with 2x4 core processors, 32 gb of RAM, 2x450 Gb of disk (raid1). Larger machines exists, but are extremely expensive. We can ask for two machines like this. As anyone some experience in this domain? Yours, t.d. 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:[EMAIL PROTECTED] 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: Using Sage with a large number of undergraduate students.
On Mon, 06 Oct 2008 at 09:16AM +0200, Thierry Dumont wrote: I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I don't have any experience with the above, although I'm guessing the sagenb.org machine deals with similar loads. I definitely want to hear about your experiences, as I have distant plans for doing the same thing at my university. My own plan is to run a server on a powerful personal machine and let students create their own accounts, and when they start complaining that it's too slow, pass their complaints on and ask for a better server. :) Dan -- --- Dan Drake [EMAIL PROTECTED] - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] Re: How add axes labels and titles to Sage plots?
As far as I know, the title function is not implemented in plot yet. It would also be very useful to have a legend function similar to the one in pylab. There has been a discussion of this on the support list already, and I concluded that someone might be working on the plot functionalities already. Just search the support list for legend. I use pylab from within Sage for any more sophisticated plotting. It works great. It would be nice if the Sage plot function would take all the options of pylab plots. No idea how hard it would be to implement it. Stan On Oct 5, 7:18 pm, Martin Albrecht [EMAIL PROTECTED] wrote: As it turns out, my comment was wrong. This works: sage: p = plot(sin,-pi,pi) sage: p.axes_labels(['foo','bar']) sage: p.show() 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] Physics package
Dear Radhakrishna, I'm taking the liberty to forward your message to Sage Support, a discussion group that deals with questions like these. I don't think that there are many people working on such functionality right now, but it might be supported through one of its packages. With kindest regards, Georg. -- Forwarded message -- Hi Georg ! Over the last few years, I have become used to the Physics Package of Maple which enables one to use bras, kets, annihilation operators and other objects for Physics. Is it possible to get equivalent definitions in Sage for Physics field theory variational calculus etc ? Any leads ? Please send me some links! Thanks Radhakrishna --~--~-~--~~~---~--~~ 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
After installing the last version of gcc-4.2.4 (I verified it with gcc -v), and re-compiling sage-3.1.2, fellows the error's message : import error /usr/lib/libstdc++.SO.6 version GLIBCXX-3.4.9 not found Thanks for help, Ines. Le Saturday 04 October 2008 00:29:09 William Stein, vous avez écrit : On Fri, Oct 3, 2008 at 1:25 PM, Ines Abdeljaoued-TEJ [EMAIL PROTECTED] wrote: I'll be to the office tomorrow; do you understand french ? You get an internal compiler error when installing the Cython spkg. You're using gcc version 4.1.0 (SUSE Linux) and the error is copied below and is, in short internal compiler error. This always indicates either a serious bug in your compiler or your hardware is defective. You should definitely upgrade to a newer version of GCC and try building Sage again from scratch. gcc -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/home/essai/Desktop/SAGEmath/sage-3.1.2/local/include/python2.5 -c /home/essai/Desktop/SAGEmath/sage-3.1.2/spkg/build/cython-0.9.8.1.1.p0/src/ Cython/Plex/Scanners.c -o build/temp.linux-i686-2.5/home/essai/Desktop/SAGEmath/sage-3.1.2/spkg/build /cython-0.9.8.1.1.p0/src/Cython/Plex/Scanners.o /home/essai/Desktop/SAGEmath/sage-3.1.2/spkg/build/cython-0.9.8.1.1.p0/src/ Cython/Plex/Scanners.c: In function '__pyx_pf_6Cython_4Plex_8Scanners_7Scanner_scan_a_token': /home/essai/Desktop/SAGEmath/sage-3.1.2/spkg/build/cython-0.9.8.1.1.p0/src/ Cython/Plex/Scanners.c:817: internal compiler error: in merge_alias_info, at tree-ssa-copy.c:235 Please submit a full bug report, with preprocessed source if appropriate. See URL:http://www.suse.de/feedback for instructions. error: command 'gcc' failed with exit status 1 Thanks, Ines. Le Friday 03 October 2008 15:37:11 mabshoff, vous avez écrit : On Oct 3, 5:30 am, Ines [EMAIL PROTECTED] wrote: Hi ! I tried to insatll a last version of sage : sage-3.1.2.tar with no sucess. How can I send you the insall.log file ? Ines. Hi Ines, please send it compressed to me off list per email. Cheers, Michael -- Ines Abdeljaoued-TEJ Unite Algorithmes et Structures, Ecole Superieure de La Statistique et de l'Analyse de l'Information de Tunis, tel : (+216)70 839 440 Poste 226 fax : (+216)70 838 170 mel : [EMAIL PROTECTED] adr : 6 rue des metiers, la Charguia 2, 2036 Ariana, Tunisia. -- Ines Abdeljaoued-TEJ Unite Algorithmes et Structures, Ecole Superieure de La Statistique et de l'Analyse de l'Information de Tunis, tel : (+216)70 839 440 Poste 226 fax : (+216)70 838 170 mel : [EMAIL PROTECTED] adr : 6 rue des metiers, la Charguia 2, 2036 Ariana, Tunisia. --~--~-~--~~~---~--~~ 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] notebook server with server_pool
As I mentioned in another thread, I'm working up to having a public Sage server at my university. Reading through the notebook() documentation, I see: server_pool -- (default: None), if given, should be a list like ['[EMAIL PROTECTED]', '[EMAIL PROTECTED]'], where you have setup ssh keys so that typing ssh [EMAIL PROTECTED] logs in without requiring a password, e.g., by typing as the notebook server user cd; ssh-keygen -t rsa then put ~/.ssh/id_rsa.pub as the file .ssh/authorized_keys2. Note -- you have to get the permissions of files and directories just right -- do a web search for more details. I did a web search and found nothing but other people looking for details! I tried for a bit to figure out the permissions, but couldn't get things to work. Can someone explain how to set this up? I understand ssh keys and Unix file permissions and so on, but I don't know what the notebook server needs or wants with respect to them. Thanks, Dan -- --- Dan Drake [EMAIL PROTECTED] - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] ntl dylib
hello, I am a new member of this group, I downloaded the source code and tried to compile it. My computer is a Mac PowerPC G5 core 2 duo, the operating system is MacOSX 10.3.9. I obtained the following messages: 1. Found Fink in your path etc. Either: (1) rename /opt/local and /sw, or (2) change PATH and DYLD_LIBRARY_PATH (Once sage is built, you can restore them.) I chose the (1) option, and renamed /sw; I did not find /opt/local. I resumed the command make, and obtained: ld: flag: -undefined dynamic_lookup can't be used with MACOSX_DEPLOYMENT_TARGET environment variable set to: 10.1 /usr/bin/libtool: internal link edit command failed make[2]: *** [libntl.dylib] Error 1 Failed to build NTL dylib. real7m7.444s user6m19.310s sys 0m42.470s sage: An error occurred while installing ntl-5.4.2.p4 Please email sage-devel http://groups.google.com/group/sage-devel explaining the problem and send the relevant part of of /Applications/sage-3.1.2/install.log. Describe your computer, operating system, etc. If you want to try to fix the problem, yourself *don't* just cd to /Applications/sage-3.1.2/spkg/build/ntl-5.4.2.p4 and type 'make'. Instead type /Applications/sage-3.1.2/sage -sh in order to set all environment variables correctly, then cd to /Applications/sage-3.1.2/spkg/build/ntl-5.4.2.p4 (When you are done debugging, you can type exit to leave the subshell.) make[1]: *** [installed/ntl-5.4.2.p4] Error 1 I typed : /Applications/sage-3.1.2/sage -sh then cd to : /Applications/sage-3.1.2/spkg/build/ntl-5.4.2.p4 but my question is: what must I do in this directory ? There is no makefile in this directory. With best regards, --~--~-~--~~~---~--~~ 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.
2008/10/6 Thierry Dumont [EMAIL PROTECTED]: I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I can add to Sage an identification on the ldap server (actually active directory) of the University, and Sage accounts will be created automatically. The more difficult question for us is: which machine? One can expect to have about 200 students using Sage at the same time, with large There is no way you can have 200 students all using exactly one sage notebook server on the same port *at the same time* and have it feel snappy still. I've done classes with 30 people at once and that worked OK -- the server I used was sage.math (16 1.8Ghz opterons from 2005). If you ran say 6 different servers, even on the same hardware, at once, that would probably work fairly well. Probably using two of the 8-core 32GB of RAM machines you list below, with say three sage notebook servers on each, would work reasonably well. If you publish the relevant notebooks the students need, and just redirect students from some master login page to one of those six distinct servers, this could work pretty well. subgroups of students doing the same thing at the same time. Ok, as it is undergraduate students, they will not make very large computations... But what about the scalability of Sage, of the web server? To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. We are currently looking at machines with 2x4 core processors, 32 gb of RAM, 2x450 Gb of disk (raid1). Larger machines exists, but are extremely expensive. We can ask for two machines like this. As anyone some experience in this domain? sagenb.org obviously has a lot of usage. I basically started it as a server from scratch 1 month ago, and over 750 people created accounts on it during the last month. -- 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: Possible to add Latex math equations to Sage plots?
On Oct 6, 2008, at 9:37 AM, William Stein wrote: On Mon, Oct 6, 2008 at 4:37 AM, David Joyner [EMAIL PROTECTED] wrote: On Mon, Oct 6, 2008 at 12:08 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Is it possible to add Latex equations to Sage plots? In 2d plots, yes, for example sage: P1 = plot(sin(x), (x,-pi,pi)) sage: P2 = text($y=\sin(x),\ -\pi\leq x\leq \pi$, (1.5,4)) sage: show(P1+P2) However, I think latex is not (yet?) implemented in text3d. Yes, there is no latex support for text in 3d plots, and in fact nothing planned either. I have no clue how it would even be possible. It would render a png and then use texture mapping. Texture mapping would be useful for a lot of other things too--jmol supports it (via voxels) but no one has gotten around to implementing it yet. - Robert --~--~-~--~~~---~--~~ 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.
To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. I can confirm this from our experience as well; on a more moderate size server even 15-20 at once becomes very problematic. - kcrisman --~--~-~--~~~---~--~~ 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: Possible to add Latex math equations to Sage plots?
On Mon, Oct 6, 2008 at 4:37 AM, David Joyner [EMAIL PROTECTED] wrote: On Mon, Oct 6, 2008 at 12:08 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Is it possible to add Latex equations to Sage plots? In 2d plots, yes, for example sage: P1 = plot(sin(x), (x,-pi,pi)) sage: P2 = text($y=\sin(x),\ -\pi\leq x\leq \pi$, (1.5,4)) sage: show(P1+P2) However, I think latex is not (yet?) implemented in text3d. Yes, there is no latex support for text in 3d plots, and in fact nothing planned either. I have no clue how it would even be possible. 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.
William Stein wrote: 2008/10/6 Thierry Dumont [EMAIL PROTECTED]: I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I can add to Sage an identification on the ldap server (actually active directory) of the University, and Sage accounts will be created automatically. The more difficult question for us is: which machine? One can expect to have about 200 students using Sage at the same time, with large There is no way you can have 200 students all using exactly one sage notebook server on the same port *at the same time* and have it feel snappy still. I've done classes with 30 people at once and that worked OK -- the server I used was sage.math (16 1.8Ghz opterons from 2005). If you ran say 6 different servers, even on the same hardware, at once, that would probably work fairly well. Probably using two of the 8-core 32GB of RAM machines you list below, with say three sage notebook servers on each, would work reasonably well. If you publish the relevant notebooks the students need, and just redirect students from some master login page to one of those six distinct servers, this could work pretty well. subgroups of students doing the same thing at the same time. Ok, as it is undergraduate students, they will not make very large computations... But what about the scalability of Sage, of the web server? To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. We are currently looking at machines with 2x4 core processors, 32 gb of RAM, 2x450 Gb of disk (raid1). Larger machines exists, but are extremely expensive. We can ask for two machines like this. As anyone some experience in this domain? sagenb.org obviously has a lot of usage. I basically started it as a server from scratch 1 month ago, and over 750 people created accounts on it during the last month. Can anyone comment on the possibility of running 25-30 sage sessions from the command line on a modest configuration? In other words, is the problem in running 25-30 sage processes, or is the bottleneck in the webserver and notebook interface? Based on your comment about running several servers on the same box, it seems that the problem is that the web server cannot handle very many concurrent connections. In that case, the recent query about using sage with mod_python or some other higher performance solution might be worth looking at again. 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: Using Sage with a large number of undergraduate students.
On Oct 6, 2008, at 10:21 AM, Jason Grout wrote: William Stein wrote: 2008/10/6 Thierry Dumont [EMAIL PROTECTED]: I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I can add to Sage an identification on the ldap server (actually active directory) of the University, and Sage accounts will be created automatically. The more difficult question for us is: which machine? One can expect to have about 200 students using Sage at the same time, with large There is no way you can have 200 students all using exactly one sage notebook server on the same port *at the same time* and have it feel snappy still. I've done classes with 30 people at once and that worked OK -- the server I used was sage.math (16 1.8Ghz opterons from 2005). If you ran say 6 different servers, even on the same hardware, at once, that would probably work fairly well. Probably using two of the 8-core 32GB of RAM machines you list below, with say three sage notebook servers on each, would work reasonably well. If you publish the relevant notebooks the students need, and just redirect students from some master login page to one of those six distinct servers, this could work pretty well. subgroups of students doing the same thing at the same time. Ok, as it is undergraduate students, they will not make very large computations... But what about the scalability of Sage, of the web server? To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. We are currently looking at machines with 2x4 core processors, 32 gb of RAM, 2x450 Gb of disk (raid1). Larger machines exists, but are extremely expensive. We can ask for two machines like this. As anyone some experience in this domain? sagenb.org obviously has a lot of usage. I basically started it as a server from scratch 1 month ago, and over 750 people created accounts on it during the last month. Can anyone comment on the possibility of running 25-30 sage sessions from the command line on a modest configuration? In other words, is the problem in running 25-30 sage processes, or is the bottleneck in the webserver and notebook interface? Yep, I remember someone a while back was going to convert the interface to use a database backend to make it scale better, but I don't think it ever got finished. As a workaround, you could start up several notebooks at once and assign 20 or so students per port, which should work fine. - Robert --~--~-~--~~~---~--~~ 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 Mon, Oct 6, 2008 at 10:11 AM, kcrisman [EMAIL PROTECTED] wrote: To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. I can confirm this from our experience as well; on a more moderate size server even 15-20 at once becomes very problematic. One thing I should emphasize is that it's not necessarily a hardware or bandwith limitation, i.e., in my experience running multiple servers on different ports on the same hardware allows one to go serve more users at once. 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: How add axes labels and titles to Sage plots?
William Stein wrote: On Mon, Oct 6, 2008 at 1:26 AM, Stan Schymanski [EMAIL PROTECTED] wrote: As far as I know, the title function is not implemented in plot yet. It would also be very useful to have a legend function similar to the one in pylab. There has been a discussion of this on the support list already, and I concluded that someone might be working on the plot functionalities already. To the best of my knowledge at present absolutely nobody is working in a concerted way on 2d or 3d plotting in Sage right now. Mike Hansen did a lot of useful cleanup, but has moved onto sphinx-ify the documentation, which is higher priority. I had hoped Emily Kirkman would work on plotting this summer, and after, but she has ended up working on different things. I had also hoped something longterm regarding plotting would come out of Sage Days 9, but that didn't happen due to the organization of that meeting. I'll keep my eyes open for a student to hire at UW to work on plotting, but so far I don't know of anybody qualified and interested yet. Gee, I wish I was a student at UW! :). I really appreciate the effort various people have put into the plotting framework. The NotImplemented parts have bothered me for a while (as well as some of the framework itself), but I haven't had time to do an overhaul, though I've made some somewhat meager attempts at starting. If someone were to spearhead such a thing, I'd like to be involved. I don't see the time in my future for spearheading such a thing until possibly next April/May at the earliest. Mike's improvements to plot.py (both his cleanup and his patch for options decorators) make such an overhaul much easier. Kudos and a candy bar to him. 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: is it possible to show() a variable with it's name = in front of it
Thank you all for your replies! I was overwhelmed by your fast and
helpful replies!
I may should have described my desired result in more detail:
I don't wanna display/print out the line
a = \frac{{2 q}}{3}
but I would like to Sage display it, as if it was processed by latex
(the look of a formula in a math book).
@ Neal Holtz
sage: def vshow(_v):
: print '%s = %s\n' % (_v,latex(globals()[_v]))
Your solution works nice, as long as there is a symbolic variable.
i.e.
sage: var('q')
sage: a = 3*q/2
sage: vshow('a')
a = \frac{{3 q}}{2}
but if there is no symbolic variable included, it's not working:
sage: b = 2/3
sage: vshow('b')
b
And as mentioned above, I desire s.t. a little bit different. Maybe
this output can be changed to that of show(). I tried, but did not
succeed:
sage: show(latex(2/3))
( as well as show(2/3) )
produces a nice formated fraction, but
sage: show(latex(b = 2/3))
only displays the fraction - what actually makes sense.
@ Georg
def ashow(**args):
... for key in args:
... print key,'=',args[key]
works quite nice! Output of ashow(a=a):
a =
2 q
---
3
this looks like the output of show() when entered in the terminal into
sage.
@ Jason Grout
Once a_2 is passed to the show function, I don't think the show
function knows where it came from, i.e., the show function has access to
the *value* of a_2, but doesn't know what variable name was actually passed.
The other solutions had the variable name passed to the function as a
string, which, of course, would be different because there you are
passing in a string, the name of the variable.
I think thats the key issue:
Is there a way to make a variable return its name as a string (s.t.
like a.name())?
Or is there a way to access the content of a variable, when you only
have a string with its name? Well, I think Neal Holtz did this with
globals()[_v]
but since I'm a novice with sage and a total novice with python, I
really don't have a clue.
My modification of his function messed up the order of the output and
did not lead to the desired result...:
sage: def vshow(_v):
sage:print '%s = %s\n' % (_v,show(globals()[_v]))
thanks again for all your valuable help!
Samuel
--~--~-~--~~~---~--~~
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.
Hi, Note -- if the notebook servers all operated on the same data (via a central database or files on the filesystem or something), then one could have the best of both worlds... I guess. But I doubt I'm putting another month of my life into the Sage notebook anytime in the near future. As we discussed with William, but for others who are interested, we have been designing Knoboo to use a centralized database via SQLAlchemy, and it is something that is definitely worth doing. The two files here describe our entire data scheme: http://trac.knoboo.com/browser/trunk/knoboo/knoboo/database/ and with SQLAlchemy you can use SQLite, MySQL, PostgreSQL, etc as the centralized database behind the scenes. Based on your comment about running several servers on the same box, it seems that the problem is that the web server cannot handle very many concurrent connections. In that case, the recent query about using sage with mod_python or some other higher performance solution might be worth looking at again. The web server (Twisted) can certainly handle hundreds to thousands of connections, read more about that here: twistedmatrix.com, especially see all the 'big' companies using Twisted. In a web application like the notebook, the webserver should be doing only 2 main things: 1) passing snippets of code to another process (the 'kernel') that actually evaluates the code, and 2) talking to a database to preserve the input and output (among other less frequent data access actions). We have spend a majority of our effort on Knoboo trying to make it a robust and scalable web application (like, for example, the 'frontend' is totally decoupled from the backend 'kernel'). What's missing from Knoboo, and what is so great about the Sage Notebook, is all the awesome usability features like @interact, etc. I'm optimistic that we will be able to merge both our best attributes in due time. -Alex -- Alex Clemesha clemesha.org --~--~-~--~~~---~--~~ 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: Possible to add Latex math equations to Sage plots?
On Monday 06 October 2008, Robert Bradshaw wrote: Yes, there is no latex support for text in 3d plots, and in fact nothing planned either. I have no clue how it would even be possible. It would render a png and then use texture mapping. Texture mapping would be useful for a lot of other things too--jmol supports it (via voxels) but no one has gotten around to implementing it yet. My idea was to render an SVG and use that information to build a 3D model, but I don't know how complex that would be. 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: Using Sage with a large number of undergraduate students.
On Mon, Oct 6, 2008 at 9:49 PM, Alex Clemesha [EMAIL PROTECTED] wrote: Hi, Note -- if the notebook servers all operated on the same data (via a central database or files on the filesystem or something), then one could have the best of both worlds... I guess. But I doubt I'm putting another month of my life into the Sage notebook anytime in the near future. As we discussed with William, but for others who are interested, we have been designing Knoboo to use a centralized database via SQLAlchemy, and it is something that is definitely worth doing. The two files here describe our entire data scheme: http://trac.knoboo.com/browser/trunk/knoboo/knoboo/database/ and with SQLAlchemy you can use SQLite, MySQL, PostgreSQL, etc as the centralized database behind the scenes. Based on your comment about running several servers on the same box, it seems that the problem is that the web server cannot handle very many concurrent connections. In that case, the recent query about using sage with mod_python or some other higher performance solution might be worth looking at again. The web server (Twisted) can certainly handle hundreds to thousands of connections, read more about that here: twistedmatrix.com, especially see all the 'big' companies using Twisted. In a web application like the notebook, the webserver should be doing only 2 main things: 1) passing snippets of code to another process (the 'kernel') that actually evaluates the code, and 2) talking to a database to preserve the input and output (among other less frequent data access actions). We have spend a majority of our effort on Knoboo trying to make it a robust and scalable web application (like, for example, the 'frontend' is totally decoupled from the backend 'kernel'). What's missing from Knoboo, and what is so great about the Sage Notebook, is all the awesome usability features like @interact, etc. I'm optimistic that we will be able to merge both our best attributes in due time. Indeed, that'd be awesome. Knoboo is lightweight. I had to stop running Sage on my virtual server (with only about 360MB of virtual ram) because it was eating several hundreds of megabytes of memory. Knoboo is running just fine. Ondrej --~--~-~--~~~---~--~~ 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: is it possible to show() a variable with it's name = in front of it
Or is there a way to access the content of a variable, when you only
have a string with its name?
'Eval' can do that :
def ashow(v):
show($+v+=%s$%latex(eval(v)))
b=2/3
ashow('b')
Hope that helps
--~--~-~--~~~---~--~~
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] no absoluate value in sqrt((something)^2)
Hello, running (sqrt(1+4*x^2/(1-x^2)^2)).radical_simplify() gives (1+x^2)/(1-x^2) but I expect absolute values, like (1+x^2)/abs(1-x^2) is this an error in Sage? Maxima has the same problem Thank you Robert Marik --~--~-~--~~~---~--~~ 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: notebook server with server_pool
On Mon, Oct 6, 2008 at 3:30 PM, Jason Grout [EMAIL PROTECTED] wrote: William Stein wrote: On Mon, Oct 6, 2008 at 3:19 AM, Dan Drake [EMAIL PROTECTED] wrote: As I mentioned in another thread, I'm working up to having a public Sage server at my university. Reading through the notebook() documentation, I see: server_pool -- (default: None), if given, should be a list like ['[EMAIL PROTECTED]', '[EMAIL PROTECTED]'], where you have setup ssh keys so that typing ssh [EMAIL PROTECTED] logs in without requiring a password, e.g., by typing as the notebook server user cd; ssh-keygen -t rsa then put ~/.ssh/id_rsa.pub as the file .ssh/authorized_keys2. Note -- you have to get the permissions of files and directories just right -- do a web search for more details. I did a web search and found nothing but other people looking for details! I tried for a bit to figure out the permissions, but couldn't get things to work. Can someone explain how to set this up? I understand ssh keys and Unix file permissions and so on, but I don't know what the notebook server needs or wants with respect to them. If foo is a user in the server pool, you should be able to login as the server user and type ssh [EMAIL PROTECTED] and have the login work without having to explicitly type a password. Have you got the above to work and things still don't work? If so, what doesn't work? Okay, I just tried using the server_pool option. I can ssh [EMAIL PROTECTED] from [EMAIL PROTECTED] I can run the sage server without the server_pool option from the server account and successfully evaluate cells. However, when the server_pool option gives [EMAIL PROTECTED] as the ssh login to use, when I try to evaluate a cell, I get an error like: Traceback (click to the left for traceback) ... IOError: [Errno 13] Permission denied: '/home/server/.sage/sage_notebook/worksheets/myuser/0/code/1.py' Does the server_pool option correctly account for the setting of permissions on the DOT_SAGE directory? Is there something else going on here? You should run a sage notebook that isn't in ~/.sage and set the permissions of that directory so that other users can read from it. Otherwise, there is no way this can work. 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 plot3d
On Mon, Oct 6, 2008 at 4:33 PM, ecanton [EMAIL PROTECTED] wrote: It seems that the function plot3d isn't working. When trying to use it, it pauses on a new line for a bit, as though it's producing the graph, but then it gives me a new prompt. plot( works just fine. Is there some package I'm missing? plot3d requires java. Is that running properly? On my intel macbook (running OS 10.4), plot3d runs perfectly. I'm using sage 3.1.2 on Mac OS X.5. --~--~-~--~~~---~--~~ 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.
Ondrej, Did you have to stop supporting Sage altogether or just the Sage Notebook? On Mon, Oct 6, 2008 at 5:10 PM, Ondrej Certik [EMAIL PROTECTED] wrote: On Mon, Oct 6, 2008 at 9:49 PM, Alex Clemesha [EMAIL PROTECTED] wrote: Hi, Note -- if the notebook servers all operated on the same data (via a central database or files on the filesystem or something), then one could have the best of both worlds... I guess. But I doubt I'm putting another month of my life into the Sage notebook anytime in the near future. As we discussed with William, but for others who are interested, we have been designing Knoboo to use a centralized database via SQLAlchemy, and it is something that is definitely worth doing. The two files here describe our entire data scheme: http://trac.knoboo.com/browser/trunk/knoboo/knoboo/database/ and with SQLAlchemy you can use SQLite, MySQL, PostgreSQL, etc as the centralized database behind the scenes. Based on your comment about running several servers on the same box, it seems that the problem is that the web server cannot handle very many concurrent connections. In that case, the recent query about using sage with mod_python or some other higher performance solution might be worth looking at again. The web server (Twisted) can certainly handle hundreds to thousands of connections, read more about that here: twistedmatrix.com, especially see all the 'big' companies using Twisted. In a web application like the notebook, the webserver should be doing only 2 main things: 1) passing snippets of code to another process (the 'kernel') that actually evaluates the code, and 2) talking to a database to preserve the input and output (among other less frequent data access actions). We have spend a majority of our effort on Knoboo trying to make it a robust and scalable web application (like, for example, the 'frontend' is totally decoupled from the backend 'kernel'). What's missing from Knoboo, and what is so great about the Sage Notebook, is all the awesome usability features like @interact, etc. I'm optimistic that we will be able to merge both our best attributes in due time. Indeed, that'd be awesome. Knoboo is lightweight. I had to stop running Sage on my virtual server (with only about 360MB of virtual ram) because it was eating several hundreds of megabytes of memory. Knoboo is running just fine. Ondrej --~--~-~--~~~---~--~~ 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 Mon, Oct 6, 2008 at 11:24 PM, Timothy Clemans [EMAIL PROTECTED] wrote: Ondrej, Did you have to stop supporting Sage altogether or just the Sage Notebook? Not sure what you mean by supporting. I was running the sage notebook from Sage so that anyone can log into it, just like sagenb.org. But my virtualserver doesn't have enough memory for that. So now I only run knoboo notebook: http://knoboo.sympy.org/ This seems to work well. And I just don't run Sage permanently on that server. I miss the features from the Sage notebook though. Ondrej --~--~-~--~~~---~--~~ 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 Mon, Oct 6, 2008 at 10:21 AM, Jason Grout [EMAIL PROTECTED] wrote: William Stein wrote: 2008/10/6 Thierry Dumont [EMAIL PROTECTED]: I would like to know if someone as used Sage with undergraduate students. My question is mainly a question about the material which would be necessary. We are currently building a project (this means: asking for money, doing a lot a bureaucracy and so on) on Sage in my University: the idea is to start the replacement of the current commercial system (Maple) by Sage. Nowadays, students use Maple on a network of Windows machines. We would like to make a large Sage server so that all the students use the web interface. I can add to Sage an identification on the ldap server (actually active directory) of the University, and Sage accounts will be created automatically. The more difficult question for us is: which machine? One can expect to have about 200 students using Sage at the same time, with large There is no way you can have 200 students all using exactly one sage notebook server on the same port *at the same time* and have it feel snappy still. I've done classes with 30 people at once and that worked OK -- the server I used was sage.math (16 1.8Ghz opterons from 2005). If you ran say 6 different servers, even on the same hardware, at once, that would probably work fairly well. Probably using two of the 8-core 32GB of RAM machines you list below, with say three sage notebook servers on each, would work reasonably well. If you publish the relevant notebooks the students need, and just redirect students from some master login page to one of those six distinct servers, this could work pretty well. subgroups of students doing the same thing at the same time. Ok, as it is undergraduate students, they will not make very large computations... But what about the scalability of Sage, of the web server? To emphasize again, I doubt it scales to more than 30 users all hammering the server at once. We are currently looking at machines with 2x4 core processors, 32 gb of RAM, 2x450 Gb of disk (raid1). Larger machines exists, but are extremely expensive. We can ask for two machines like this. As anyone some experience in this domain? sagenb.org obviously has a lot of usage. I basically started it as a server from scratch 1 month ago, and over 750 people created accounts on it during the last month. Can anyone comment on the possibility of running 25-30 sage sessions from the command line on a modest configuration? In other words, is the problem in running 25-30 sage processes, or is the bottleneck in the webserver and notebook interface? If your hardware is pretty good (which the OP's hardware is), the problem is definitely the webserver and notebook interface. Running many sage sessions at once gets around this. Note -- if the notebook servers all operated on the same data (via a central database or files on the filesystem or something), then one could have the best of both worlds... I guess. But I doubt I'm putting another month of my life into the Sage notebook anytime in the near future. Based on your comment about running several servers on the same box, it seems that the problem is that the web server cannot handle very many concurrent connections. In that case, the recent query about using sage with mod_python or some other higher performance solution might be worth looking at again. Maybe it would be 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 plot3d
On Oct 6, 2008, at 18:55 , Marshall Hampton wrote: This might be related to a recent update for java on 10.5 - ecanton, do you know if you got that update? It came out within the last two weeks I think. The download is dated 9/12, I think. I have installed it (10.5.5), and I can run plot3d() without apparent problems. Justin -- Justin C. Walker, Curmudgeon at Large Director Institute for the Enhancement of the Director's income --- -- They said it couldn't be done, but sometimes, it doesn't work out that way. - Casey Stengel -- --~--~-~--~~~---~--~~ 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: notebook server with server_pool
On Mon, 06 Oct 2008 at 03:41PM -0700, William Stein wrote: Okay, I just tried using the server_pool option. I can ssh [EMAIL PROTECTED] from [EMAIL PROTECTED] I can run the sage server without the server_pool option from the server account and successfully evaluate cells. However, when the server_pool option gives [EMAIL PROTECTED] as the ssh login to use, when I try to evaluate a cell, I get an error like: Traceback (click to the left for traceback) ... IOError: [Errno 13] Permission denied: '/home/server/.sage/sage_notebook/worksheets/myuser/0/code/1.py' That was exactly the sort of error I was getting. It seemed like no amount of chmod'ing would fix it. You should run a sage notebook that isn't in ~/.sage and set the permissions of that directory so that other users can read from it. Otherwise, there is no way this can work. Ah! That solved it. I might open a ticket for a better docstring -- I never realized the permissions were related to the 'directory' option. Dan -- --- Dan Drake [EMAIL PROTECTED] - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] Re: is it possible to show() a variable with it's name = in front of it
On Oct 7, 12:27 am, kkwweett [EMAIL PROTECTED] wrote:
'Eval' can do that :
def ashow(v):
show($+v+=%s$%latex(eval(v)))
b=2/3
ashow('b')
Thank you! That's it.
--~--~-~--~~~---~--~~
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
-~--~~~~--~~--~--~---
