This looks like a very serious bug to me. I can confirm that the bug occurs with 4.8.alpha6 and 5.0.prealpha.
John On 8 January 2012 13:31, Vegard Lima <vegard.l...@gmail.com> wrote: > Sorry for replying to myself but after a bit of further digging > it appears that numpy didn't have anything to do with this. > It was just the route by which I came across the following problem: > > sage: C = random_matrix(ZZ, 10, 80, distribution='uniform') > sage: C.ncols() - (C.right_kernel().dimension() + C.rank()) > -10 > > On 32bit sage 4.7 on osx the answer is the correct 0. > Switching ZZ to QQ or RDF also restores the rank-nullity theorem. > > > Thanks, > -- > Vegard Lima > > -- > 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 -- 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
