Posted by K.A.Hafez on May 01, 1998 at 02:44:02:

My Dear:

I encounter a very strange/severe problem concerning the determination of the eigenvalue and the associated eigenvectors. I know eigenvalue problem is a very elementary problem nowadays, but really, I coldn't solve it myself. Even, I wrote a program for this, it didn't give rasonable results

My problem concerning the solution of the following eigenvalue problem:

{[K]-c^2[M]}.X=0.0

where:

K : is smmetric band real stiffness matrix (154x154)

M: is antisymmetric real mass matrix (154x154)

c: is the natura frequency or the eigenvalues

X: is the eigenvector

I already tried some routines called RGG and RG from the netlib, but any of them didn't give correct results. In fact all of them gave very strange results.

Even I tried some checks to check the algorithm which already incorporated inside the subroutine, but I couldn't decide its suitablitiy.

I would appreciate it if you are kind enoug and try to introduce any kind of help as soon as you can.

waiting in front of the screen.

sincerely,

K.A.Hafez

- Re: eigenvalue problem
**Terry J. Hilsabeck***01:30:16 8/02/98*(0)