### Eigenvalue problem

Posted:

**Fri Mar 10, 2006 10:55 am**Hi,

In lapack library, there are many routines for computing eigenvalues. But now, I only want to konw the maximum and the minimum eigenvalues for a real symmetric, positive definite matrix, because In my program, I will compute the maximum and the minimum eigenvalues for many, many times. So, the time saving become a serious problem.

Many routines will need N^3 operations. So can you tell me whether the routines for this problem needed less operations are contained in lapack library?

Thank you!

Yang

In lapack library, there are many routines for computing eigenvalues. But now, I only want to konw the maximum and the minimum eigenvalues for a real symmetric, positive definite matrix, because In my program, I will compute the maximum and the minimum eigenvalues for many, many times. So, the time saving become a serious problem.

Many routines will need N^3 operations. So can you tell me whether the routines for this problem needed less operations are contained in lapack library?

Thank you!

Yang