Comment #2 on issue 3406 by mrock...@gmail.com: SparseMatrix attribute is
incompatible with MatrixBase methods
http://code.google.com/p/sympy/issues/detail?id=3406
I've mentioned this in the PR but I'll mention it here too. ImmutableMatrix
also inherits from MatrixBase. Functionality required by ImmutableMatrix
should not be moved to MutableMatrix. This is most of MatrixBase.
Unfortunately This dependence is not well tested and it would be easy to
move functionality out of ImmutableMatrices without triggering a warning
from the tests.
Ideally MutableMatrix and ImmutableMatrix should have almost the exact same
interface. This is why MatrixBase was created.
The solution (I think) is not to move functionality from MatrixBase into
MutableMatrix but to sever the connection between MatrixBase and
SparseMatrix and to create a new class, MatrixInterface above both. I.e.
MatrixInterface -> MatrixBase
MatrixInterface -> SparseMatrix
MatrixBase -> MutableMatrix
MatrixBase -> ImmutableMatrix
If you remember please CC me on all pull requests and issues that suggest
taking functionality away from MatrixBase and ImmutableMatrix.
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