strings and other objects in matrices

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Hi,

Rather than me starting by creating a thin wrapper around a list of lists and calling it a SpecialMatrix, does anyone have any ideas creating SpecialMatrix class deriving from some base matrix class such that I can load up the matrix with objects in the entries?

Ultimately I would not like to recreate matrix addition and matrix multiplication and instead leverage what's currently in existence.

In the documentation, it specifically says it can pull callable objects. Any tips?http://www.sagemath.org/doc/reference/sage/matrix/constructor.html

Thanks!