Thanks, Robert. I'll dig deeper. On Dec 28, 11:24 pm, Robert Bradshaw <rober...@math.washington.edu> wrote: > On Tue, Dec 28, 2010 at 8:38 PM, Rob Beezer <goo...@beezer.cotse.net> wrote: > > sage: A=matrix(QQ,2,range(4)) > > sage: B=matrix(ZZ,2,range(4)) > > sage: C=A.echelon_form() > > sage: D=B.echelon_form() > > sage: C.is_mutable() > > True > > sage: D.is_mutable() > > False > > > Should C and D be different with regard to mutability? If not, should > > both results be immutable? (I'd rather not have to handle both > > possibilities!) > > It's almost certain that mutability of C is an oversight. > > - Robert
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