True. I was thinking about
sage: M = MatrixSpace(ZZ,3)
sage: a = M.one()
sage: a.is_mutable()
False
On 17/02/16 13:16, Nathann Cohen wrote:
Having immutability by default would be particuarly annoying in the
following case
sage: a = identity_matrix(ZZ, 3)
sage: b = a + a # immutable
sage: b[0,1] = 2 # niet
Why would identity_matrix return an immutable matrix ? Or did I miss
something ? All that we need is that the sum/product of immutable
matrices return an immutable matrix, and that does not seem in
conflict with your example.
Nathann
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