[sage-support] Re: create a subdiagonal matrix quickly
On Jun 20, 10:18 pm, Robert Bradshaw rober...@math.washington.edu wrote: sage: n = 10 sage: m = block_matrix([0, zero_matrix(1,1), identity_matrix(n), 0]) sage: m.subdivide() # get rid of the block divisions sage: m [0 0 0 0 0 0 0 0 0 0 0] [1 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 0 0 0 0 0 0] [0 0 1 0 0 0 0 0 0 0 0] [0 0 0 1 0 0 0 0 0 0 0] [0 0 0 0 1 0 0 0 0 0 0] [0 0 0 0 0 1 0 0 0 0 0] [0 0 0 0 0 0 1 0 0 0 0] [0 0 0 0 0 0 0 1 0 0 0] [0 0 0 0 0 0 0 0 1 0 0] [0 0 0 0 0 0 0 0 0 1 0] You can also use this to get anything you want on the sub-diagonal (or pretty much anywhere). sage: m = block_matrix([0, zero_matrix(1,1), diagonal_matrix([10, 20, 30, 40]), 0]); m.subdivide(); m [ 0 0 0 0 0] [10 0 0 0 0] [ 0 20 0 0 0] [ 0 0 30 0 0] [ 0 0 0 40 0] Very nice - I didn't know about block_matrix. In addition, it seems block_matrix has an optional argument subdivide. sage: n = 10 sage: m = block_matrix([0, zero_matrix(1,1), identity_matrix(n), 0],subdivide=False) sage: m [0 0 0 0 0 0 0 0 0 0 0] [1 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 0 0 0 0 0 0] [0 0 1 0 0 0 0 0 0 0 0] [0 0 0 1 0 0 0 0 0 0 0] [0 0 0 0 1 0 0 0 0 0 0] [0 0 0 0 0 1 0 0 0 0 0] [0 0 0 0 0 0 1 0 0 0 0] [0 0 0 0 0 0 0 1 0 0 0] [0 0 0 0 0 0 0 0 1 0 0] [0 0 0 0 0 0 0 0 0 1 0] --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: create a subdiagonal matrix quickly
rickhg12hs wrote: On Jun 20, 10:18 pm, Robert Bradshaw rober...@math.washington.edu wrote: sage: n = 10 sage: m = block_matrix([0, zero_matrix(1,1), identity_matrix(n), 0]) sage: m.subdivide() # get rid of the block divisions sage: m [0 0 0 0 0 0 0 0 0 0 0] [1 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 0 0 0 0 0 0] [0 0 1 0 0 0 0 0 0 0 0] [0 0 0 1 0 0 0 0 0 0 0] [0 0 0 0 1 0 0 0 0 0 0] [0 0 0 0 0 1 0 0 0 0 0] [0 0 0 0 0 0 1 0 0 0 0] [0 0 0 0 0 0 0 1 0 0 0] [0 0 0 0 0 0 0 0 1 0 0] [0 0 0 0 0 0 0 0 0 1 0] You can also use this to get anything you want on the sub-diagonal (or pretty much anywhere). sage: m = block_matrix([0, zero_matrix(1,1), diagonal_matrix([10, 20, 30, 40]), 0]); m.subdivide(); m [ 0 0 0 0 0] [10 0 0 0 0] [ 0 20 0 0 0] [ 0 0 30 0 0] [ 0 0 0 40 0] Very nice - I didn't know about block_matrix. In addition, it seems block_matrix has an optional argument subdivide. sage: n = 10 sage: m = block_matrix([0, zero_matrix(1,1), identity_matrix(n), 0],subdivide=False) sage: m [0 0 0 0 0 0 0 0 0 0 0] [1 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 0 0 0 0 0 0] [0 0 1 0 0 0 0 0 0 0 0] [0 0 0 1 0 0 0 0 0 0 0] [0 0 0 0 1 0 0 0 0 0 0] [0 0 0 0 0 1 0 0 0 0 0] [0 0 0 0 0 0 1 0 0 0 0] [0 0 0 0 0 0 0 1 0 0 0] [0 0 0 0 0 0 0 0 1 0 0] [0 0 0 0 0 0 0 0 0 1 0] I should mention that these methods are all nice for this problem, but they also end up copying an awful lot of zeros. I think it would be way more efficient in general to make a zero matrix, then set the right diagonal by hand using a for loop. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How to doctest a pyx file?
Hi! On 20 Jun., 22:10, gsw georgswe...@googlemail.com wrote: If you wish, we could discuss this topic further and in depth on sage- devel (where it belongs), just open a thread there. In the first place, I thought it was a support problem, because I thought that testing any text file should be simple (and used to work), and I simple wasn't aware how it works. Anyway: http://groups.google.com/group/sage-devel/browse_thread/thread/3f9c8660ed742303 Cheers, Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: create a subdiagonal matrix quickly
I should mention that these methods are all nice for this problem, but they also end up copying an awful lot of zeros. I think it would be way more efficient in general to make a zero matrix, then set the right diagonal by hand using a for loop. Don't you think using a sparse matrix would be a better thing to do in such situations? Rajeev --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] how to controll precision when show'ing formulas?
hello, I am constructing simple interact http://sagenb.org/home/pub/592/ in published worksheet, interact seems not to function so I give the picture.. http://ftp.akl.lt/users/jurgis/etc/formule_show_precision--how.png I want that show(function) would give me just 1 precision digit after comma how could I achieve this? now I use html which is quite unconfortable thanks in advance -- Jurgis Pralgauskis Don't worry, be happy and make things better ;) --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Sage Installation on Mac OS X 10.5.7
1. I am running Mac OS X 10.5.7. 2. I downloaded sage-4.0.1-OSX10.5.PowerPC-PowerMacIntosh-Darwin.dmg 3. When I run the Unix Executable file sage using Terminal, I get the following error: /Applications/sage-4.0.1-OSX10.5-PowerPC-PowerMacintosh-Darwin/sage/ local/bin/sage-sage: line 198: 407 Illegal instruction sage- ipython $@ -i 4. What do I have to do? Thanks. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Install problem for Sage
Hi I encountered the IO Error: [Errno 30] (last line of the the below quoted message) while installing Sage. Can anyone out there please help? -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information.| -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. Traceback (most recent call last): File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 181, in module update_library_files(R) File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 128, in update_library_files open(LIB + F,'w').write(H) IOError: [Errno 30] Read-only file system: '/Volumes/sage-4.0.1- OSX10.5-Intel-i386-Darwin/sage/local/lib/libcord.la' --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Install problem for Sage
2009/6/21 lim pete...@net-yan.com: Hi I encountered the IO Error: [Errno 30] (last line of the the below quoted message) while installing Sage. Can anyone out there please help? Try starting Sage from the terminal and typing cd /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage sudo ./sage William -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. Traceback (most recent call last): File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 181, in module update_library_files(R) File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 128, in update_library_files open(LIB + F,'w').write(H) IOError: [Errno 30] Read-only file system: '/Volumes/sage-4.0.1- OSX10.5-Intel-i386-Darwin/sage/local/lib/libcord.la' -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Install problem for Sage
Hi William I was asked for password after typing su ./sage. What shall I response? P Lim On Jun 21, 9:00 pm, William Stein wst...@gmail.com wrote: 2009/6/21 lim pete...@net-yan.com: Hi I encountered the IO Error: [Errno 30] (last line of the the below quoted message) while installing Sage. Can anyone out there please help? Try starting Sage from the terminal and typing cd /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage sudo ./sage William -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. Traceback (most recent call last): File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 181, in module update_library_files(R) File /Volumes/sage-4.0.1-OSX10.5-Intel-i386-Darwin/sage/local/bin/ sage-location, line 128, in update_library_files open(LIB + F,'w').write(H) IOError: [Errno 30] Read-only file system: '/Volumes/sage-4.0.1- OSX10.5-Intel-i386-Darwin/sage/local/lib/libcord.la' -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage Installation on Mac OS X 10.5.7
On 21 Jun., 15:01, William Stein wst...@gmail.com wrote: 2009/6/21 quark123 alexwo...@gmail.com: 1. I am running Mac OS X 10.5.7. 2. I downloaded sage-4.0.1-OSX10.5.PowerPC-PowerMacIntosh-Darwin.dmg 3. When I run the Unix Executable file sage using Terminal, I get the following error: /Applications/sage-4.0.1-OSX10.5-PowerPC-PowerMacintosh-Darwin/sage/ local/bin/sage-sage: line 198: 407 Illegal instruction sage- ipython $@ -i 4. What do I have to do? Thanks. Do you have a G4 or a G5? Your option are either build from source or wait for us to produce a binary that works on your hardware. William As soon as the ...G4... Mac OS X binary for Sage 4.0.2 has been mirrored out, please download and test it, and report back. It has OSX10.4 in its name, but should work fine on OS X 10.5. Since it is built on a 550MHz PowerBook, it always quite a little longer than th other builds. (It is done by now, but I have yet to test it, to upload it, and then it has to be put on the server.) Cheers, gsw @William: I'll open a trac ticket for issuing a better error message ... -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: how to controll precision when show'ing formulas?
On Sun, 21 Jun 2009 at 12:15PM +0300, Jurgis Pralgauskis wrote: hello, I am constructing simple interact http://sagenb.org/home/pub/592/ in published worksheet, interact seems not to function so I give the picture.. http://ftp.akl.lt/users/jurgis/etc/formule_show_precision--how.png I want that show(function) would give me just 1 precision digit after comma how could I achieve this? You can use Python's string formatting: http://docs.python.org/library/stdtypes.html#string-formatting To get floating-point numbers to display with one decimal point, do something like this: sage: '%.2f' % pi '3.14' sage: '%.1f' % pi '3.1' sage: '%.6f' % pi '3.141593' See the Python documentation I linked to above for more details. Dan -- --- Dan Drake dr...@kaist.edu - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
