Looking for a Lamczos program in fortran

[yshai avishai]

Anyone can help me getting a source deck of Lanczos in f77 for large sparse Hermitian matrices? I need one that is user friendly. There is one written by Jane Cullum and Ralph Willowghbi that I find too difficult to use. Or is there some library that has it and can be linked?

Thanks in advance

 

[SteamKing]

Have you tried LINPACK?

 

[SteamKing]

Buncha stuff here:

http://www.netlib.org/lanczos/

 

[AlephZero]

I don't know that book, but it was written in 1985 so it dates back almost to the start of "practical" use of Lanczos eigensolution methods, and therefore I would be cautious about the quality of the algorithms. Also note the authors' largest test problem was only 5,000 DOF, which is 100 times smaller than today's concept of a "large" eigenproblem.

Try http://www.caam.rice.edu/software/ARPACK/

 

[AlephZero]

If you want to undestand the method (rather than just use a library routine), this will tell you more than most people will ever want to know: http://web.eecs.utk.edu/~dongarra/etemplates/book.html