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While we have presented the IRLM as much as possible in template form,
we do not recommend implementation from this description for production
purposes. High-quality software is freely available in ARPACK.
This software is based upon the implicitly
restarted Arnoldi method (IRAM) that is presented here in
When the matrix is symmetric (Hermitian) this reduces to the
IRLM described in this section.
ARPACK provides various drivers in template form for direct application to
, SI, and for computing a partial
SVD of a general rectangular matrix.
For complete information, one should consult the ARPACK
Users' Guide .
The thick restart variant of Wu and Simon  is implemented in
the code TRLAN.
For more information about this software, including how to access it,
see the book's homepage ETHOME.