On Sat, Jan 1, 2011 at 8:09 PM, Rob Beezer <goo...@beezer.cotse.net> wrote:
> A fix is available at   http://trac.sagemath.org/sage_trac/ticket/10543

Good, because this is a major bug!  See below for how it could wreak havoc:

sage: A = matrix(QQ,2,range(4))
sage: C = A.echelon_form()
sage: C[0,0] = 20
sage: A.echelon_form()
[20  0]
[ 0  1]

But that's not an echelon form!

William

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