On Thu, Jun 7, 2012 at 4:41 PM, Nils Bruin <nbr...@sfu.ca> wrote: > On Jun 7, 4:19 pm, William Stein <wst...@gmail.com> wrote: >> Hi Sage-Devel, >> >> I'm randomly running into segfaults when multiplying matrices over the >> integers, in the course of doing basic modular symbols calculations. >> For example, sometimes (but not always), this crashes: >> >> sage: M = ModularSymbols(389,sign=0).cuspidal_submodule().decomposition()[0] > > I observed (once) on Sage 4.7.1 (Fedora 15 x64): > > sage: %time M = > ModularSymbols(389,sign=0).cuspidal_submodule().decomposition()[0] > ArithmeticError: subspace is not invariant under matrix > > I'm not able to reliably reproduce this error either.
Thanks for reporting this, which is different than what I saw before. -- William > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
