Library for Eigenvalues and Eigenvectors

Hi everyone,
does anyone knows any library in c for calculating eigenvalues and eigenvectors of large, symmetric, sparse matrices?
Specifically i want the second smallest eigenvalue and the eigenvector!
Forgive me for my bad english!
Thnx.

A quick search of the Web brings up GSL - GNU Scientific Library.

Thanks! Any other suggestion?

There are beyond too many to name. A popular choice is LAPACK — Linear Algebra PACKage.

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Originally Posted by ioan1ioan

Thanks! Any other suggestion?

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Why don't you just Google this yourself?

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Originally Posted by ioan1ioan

Any other suggestion?

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You can try: C matrix library