diagonalizing large sparse matrices

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Posted by Nigel Badnell on November 28, 1997 at 11:11:39:

I have large block tri-diagonal matrices that I want
all the e-values and e-vectors from, real symmetric
initially, but complex symmetric in general. Lanczos
methods are generally the way to go for large sparse
matrices but block tridiagonal should make things
easier.....does anyone have any suggestions, pointers
to codes? (The blocks themselve are non-sparse but
are readily diagonalizable.)

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