non square matrix

[cocconat]

for non square matrix the dynamic function has some problem due to the absence of attributes definition in the nx.Graph().edges(), this bug is solvable:
the matrix_graph function should assign attributes for a square matrix with dimension of the largest axe, then assign 1 to the diagonal value of the matrix (the node can move to itself only) ad 0 to all the rest.

This problem is absent in case of square matrix