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ARnoldi PACKage, developed at Rice University

ARPACK is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems.
PARPACK is a parallel version of ARPACK for distributed memory parallel architectures.

Important Features

  • Reverse communication interface
  • Single and double precision real arithmetic versions for symmetric, non-symmetric, standard or generalized problems
  • Single and double precision complex arithmetic versions for standard or generalized problems
  • Routines for banded matrices - standard or generalized problems
  • Routines for The Singular Value Decomposition
  • Example driver routines that may be used as templates to implement numerous shift-invert strategies for all problem types, data types and precision