Posted by Nils Wagner on May 20, 1998 at 05:10:22:

I would like to approximate an implicit dependent

lambda matrix by the following series for

a given range 0 \le \lambda \le \lambda_1

K(\lambda) = A_0 + i \lambda A_1 - \lambda^2 A_2

K complex dynamic matrix

A_0,A_1,A_2 real matrices

A_0 : stiffness matrix

A_1 : damping matrix

A_2 : mass matrix

How can I get the best fit for the matrices A_0,A_1,A_2 ?