On Sat, Jun 19, 2010 at 7:33 AM, Johannes <dajo.m...@web.de> wrote: > i tried the first example in the given link and i get the following error: > > sage: V0 = span([[1/2,0,0],[3/2,2,1],[0,0,1]],ZZ) > --------------------------------------------------------------------------- > TypeError Traceback (most recent call last) > > /home/j_schn14/<ipython console> in <module>() > > /usr/lib/python2.5/site-packages/sage/modules/free_module.pyc in span(R, > gens, check, already_echelonized) > 349 [1 0 1] > 350 """ > --> 351 if len(gens) == 0: > 352 return FreeModule(R, 0) > 353 else: > > /usr/lib/python2.5/site-packages/sage/rings/integer_ring.so in > sage.rings.integer_ring.IntegerRing_class.__len__ > (sage/rings/integer_ring.c:3903)() > > TypeError: len() of unsized object > > is this a bug, or am I doing something wrong? > greatz Mad
What version of Sage are you using? It works fine in recent versions: flat:Library wstein$ sage ---------------------------------------------------------------------- | Sage Version 4.4.2, Release Date: 2010-05-19 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: V0 = span([[1/2,0,0],[3/2,2,1],[0,0,1]],ZZ) sage: sage: V0 Free module of degree 3 and rank 3 over Integer Ring Echelon basis matrix: [1/2 0 0] [ 0 2 0] [ 0 0 1] > > > Am 19.06.2010 00:32, schrieb William Stein: >> On Fri, Jun 18, 2010 at 3:26 PM, Mad <dajo.m...@web.de> wrote: >> >>> Hi folkz, >>> i want to create a quotient of two submodules generatet by some >>> vektors and i don't know how to do this. >>> >> See the examples here: >> >> http://sagemath.org/doc/reference/sage/modules/fg_pid/fgp_module.html >> >> Already, the first example there is what you're asking about. >> >> William >> >> >>> i tried this: >>> m = ZZ^2 >>> m1 = m.submodul([2,1],[1,2]) #this is ZZ^2 again, but of type >>> 'sage.modules.free_module.FreeModule_submodule_pid' >>> m2 = m.submodul([3,2],[2,1]) >>> #i want to do something like: >>> mQuot = m1.quotient(m2) >>> >>> but m1 (or FreeModule_submodule_pid) does not have a member quotient >>> like it has sage.modules.free_module.FreeModule_ambient_pid (of wich >>> typ m is). >>> >>> How do i have to do it? >>> >>> greatz and thnx for your tipps and answers Mad >>> >>> -- >>> 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 > -- William Stein 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 URL: http://www.sagemath.org
