> Perhaps should we have a "mutable" argument (True by default to be consistent
> with the current behaviour) in the matrix/vector constructors, so that we can
> do:
>
> {vector(m.row(0), mutable=False) for m in blah}
That would be a "working fix", but really the problem is that
operations between immutable objects stubbornly keep returning
immutable objects that you don't want. I don't expect to see
"immutable + immutable = mutable" become practical anytime soon.
sage: M = Matrix()
sage: M.set_immutable()
sage: hash(M+M)
...
TypeError: mutable matrices are unhashable
sage: hash(tuple()+tuple())
3527539
And of course the same happens with our clusmy "copy" policy. But when
people refuse to see something, well...
Nathann
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