I have another one for you. I'm afraid I can't give you a lot of details, as I am having difficulty reproducing it outside of our program. Maybe you can give me some advice about where to look.
Basically, we are trying to calculater the eigenvalues and eigenvectors for a 135x135 matrix using DSYEVX. The matrix seems fine on input, but during the operation a floating-point invalid operation exception is triggered (we have the FPEs enabled). When I catch that exception and examine the matrix, it has a number of NANs.
Any idea what could cause that to happen? I just need a push in the right direction.