If you use SquareMatrix, then it is clear, what the identity matrix is,
namely 1. So one can just create such a matrix and then convert it to
the generic Matrix domain. But maybe, you actually like SquareMatrix
> is there a command / "shortcut" for creating the identity matrix of a certain size?
> Or is it necessary to use the matrix()-command and set all the values on the diagoanl to one and all others to zero?
> Would be much easier, if there is something like identitiymatrix(3),
> which would make a 3x3 identity-matrix.
> any ideas?
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