On Sun, Jan 8, 2012 at 9:12 AM, Dima Pasechnik <[email protected]> wrote: > It's hard to say whether it's a linear algebra bug, or matrix creation bug. > Could you check that the result of A = matrix(QQ,A) actually makes sense?
It looks ok to me: sage: A = matrix(QQ,A) sage: A 10 x 76 dense matrix over Integer Ring (type 'print A.str()' to see all of the entries) sage: A.str() '[ 1 -1 1 1 1 1 -1 -1 1 -1 1 -1 1 -1 -1 -1 1 -1 1 -1 -1 -1 etc etc... The thing is that the A.right_kernel_matrix() is padded with zeros. It has "rank - (dim null space)" extra zero columns. The first "dim null space" columns are correctly computed. Thanks, -- Vegard Lima -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
