inverse matrix problem, why inv(A)*A~=I

hi everyone,

while solving a set of equations i can get a square matrix in various sizes, but whatever the matrix size is, i got singularity warnings.

i tried to get identity matrix with the following statements to provide consistency:

inv(A)*A and pinv(A)*A

but both of them gave a result of nonsense matrices

what may be the problem?

thanks in advance

Answer 1

[Matt J]

Your choices of A may be singular?

[John D'Errico]

Yeah. I wonder if the warnings about singular matrices may be a hint that the matrix is indeed singular? :)