Pedro MolinaMorales

June 4, 1999 22:44 
Preconditioning & eigenvalues
I'm trying to apply the preconditioning method in Choi & Merkles's AIAA 841638 paper to my 2D implicit code. I'm having trouble trying to calculate the eigenvalues of the modified (preconditioned) system. I've used Matlab to calculate them, but the computer just yields a huge amount of variables. Is there a fast way to obtain the eigenvalues that you may know? Is it usually done by hand? I shall very much appreciate your help.
