To have an idea of the usage I went trough the code:
- MatrixSpace.identity_matrix implement 1.
- MatrixSpace.zero_matrix implement 3.
Of course, my opinion is to make those three methods implements
2. :-)
+1 for doing option (2).
I very often want to start with the zero_matrix or the identity_matrix
and "fill in" the rest of the matrix. But I also want the access
routines to be fast! So I vote for copy-on-write semantics, if
possible.
Nick
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