Compiling the source seems to have fixed it. Thanks for the help. On Aug 6, 4:29 am, William Stein <wst...@gmail.com> wrote: > On Saturday, August 6, 2011, Jacob Schlather <jacob.schlat...@gmail.com> > wrote: > > >>It sounds like your copy of Sage is incorrectly installed. It would > >>be helpful to provide tons of useful information about > >>your sage install. > > > This is entirely probable. I unzipped the sage-4.7-linux-64bit- > > ubuntu_10.04.1_lts-x86_64-Linux, > > into a folder and have been using the pre-compiled binary. I'm > > currently running 64 bit Ubuntu 10.10 - Maverick. I am running python > > 2.6.6 though, which could possibly be an issue. Sorry about the > > inconvenient form of the matrix, I had just grabbed the output. And > > I'm also segfaulting if I just do a random matrix (such as your > > example). So it's definitely an issue with my install or that I'm > > still running python 2.6.6. Perhaps updating to 3.0 will fix it. > > Your systemwide python is irrelevant. Try building sage from source. > > > > > > > > > > > > > On Aug 6, 3:05 am, William Stein <wst...@gmail.com> wrote: > >> On Fri, Aug 5, 2011 at 10:34 PM, Jacob Schlather > > >> <jacob.schlat...@gmail.com> wrote: > >> > I'm having a bit of a strange issue, I'm working on something where I > >> > need to find the rank of a somewhat large matrix over a finite field. > >> > I recall testing sage's capabilities when I was looking at how I was > >> > going to take the rank and remember sage taking the rank of matrices > >> > much larger than the one that's giving me trouble. Anyway the matrix > >> > I'm having an issue with is in the following file > >> >https://docs.google.com/leaf?id=0B_KM7xCfSwolYmQ4YTEzYjItYTNiZC00MTAx... > >> > . > > >> It is an interesting exercise just to load that matrix into Sage, > >> given the way you provided it. > >> It would have been much nicer to provide a link to a pickle, or > >> sage_input, or convert > >> the matrix to a list first or something. Anyway, after downloading > >> your matrix, I can make the > >> corresponding Sage matrix as follows, I think: > > >> sage: a = open('Matrix.dat').readlines()[1:] > >> sage: a = > > ''.join(open('Matrix.dat').readlines()[1:]).replace('[','').replace(']\n',' > ,').replace(' > > > > > > > > >> ',',') > >> sage: m = matrix(GF(5), 255,121, eval('['+a+']')) > > >> I then try to compute the rank, and it seems to give me the answer > instantly: > > >> sage: time m.rank() > >> 121 > >> Time: CPU 0.01 s, Wall: 0.01 s > > >> The answer seems very reasonable, since it would be the answer for a > >> random matrix of that size. > >> But who knows, maybe I read your matrix in incorrectly. > > >> > The program works like a charm for matrices of smaller sizes, during > >> > this run it will get up to around size 381*70 before crashing. If I'm > >> > working over GF(7) then it's segfaulting for a matrix the size of 180 > >> > x 116. It's possible that the error is somehow hidden in my program, > > >> sage: a = random_matrix(GF(7), 180, 116) > >> sage: time a.rank() > >> 116 > >> Time: CPU 0.00 s, Wall: 0.00 s > > >> It sounds like your copy of Sage is incorrectly installed. It would > >> be helpful to provide tons of useful information about > >> your sage install. > > >> > in the off chance I've uploaded it here as well > >> >https://docs.google.com/leaf?id=0B_KM7xCfSwolY2UxNDA4OGQtZTJhZS00ZDBl... > >> > . The offending inputs would be > >> > Lambda(5,5,5,1) and Lambda(7,4,7,1), of course increase the majority > >> > of those values will also give the same error. > > >> > The error message I'm getting is: > > >> > RuntimeError Traceback (most recent call > >> > last) > > >> > /media/Media/Sage/sage-4.7-linux-64bit-ubuntu_10.04.1_lts-x86_64-Linux/ > >> > <ipython console> in <module>() > > >> > /media/Media/Sage/sage-4.7-linux-64bit-ubuntu_10.04.1_lts-x86_64-Linux/ > >> > <string> in Lambda(q, m, k, r) > > >> > /media/Media/Sage/sage-4.7-linux-64bit-ubuntu_10.04.1_lts-x86_64-Linux/ > >> > local/lib/python2.6/site-packages/sage/matrix/matrix_modn_dense.so in > >> > sage.matrix.matrix_modn_dense.Matrix_modn_dense.rank (sage/matrix/ > >> > matrix_modn_dense.c:11595)() > > >> > RuntimeError: Segmentation fault > > >> > -- > >> > 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 athttp:// > > groups.google.com/group/sage-support>> > URL:http://www.sagemath.org > > >> -- > >> William Stein > >> 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 > > > URL:http://www.sagemath.org > > -- > William Stein > 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 URL: http://www.sagemath.org
