Software Availability

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 §7.6. When the matrix $A$ is symmetric (Hermitian) this reduces to the IRLM described in this section.

ARPACK provides various drivers in template form for direct application to $A$, SI, and for computing a partial SVD of a general rectangular matrix. For complete information, one should consult the ARPACK Users' Guide [295].

The thick restart variant of Wu and Simon [463] is implemented in the code TRLAN.

For more information about this software, including how to access it, see the book's homepage ETHOME.