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Fortran 77 subroutines for solving large scale eigenvalue problems

ARPACK is a collection of Fortran 77 subroutines designed to solve large scale eigenvalue problems.

The package is designed to compute a few eigenvalues and corresponding eigenvectors of a general n by n matrix A. It is most appropriate for large sparse or structured matrices A where structured means that a matrix-vector product w <- Av requires order n rather than the usual order n**2 floating point operations. This software is based upon an algorithmic variant of the Arnoldi process called the Implicitly Restarted Arnoldi Method (IRAM).

Package version:3.0.1


arpack-ng - 3.0.1

   * libtool was missing (Closes: #615)
   * Missing license information (Closes: #614)
   * TODO added

 -- Sylvestre Ledru <>  Tue, 13 Dec 2011 16:33:25 +0100

arpack-ng - 3.0

   * Patches from Scilab
     second_NONE used by default (TO DO replace by second in LAPACK)
     second_NONE works with all fortrans compilers (used by default wi


BSD Software License

Pertains to ARPACK and P_ARPACK

Copyright (c) 1996-2008 Rice University.  
Developed by D.C. Sorensen, R.B. Lehoucq, C. Yang, and K. Maschhoff.
All rights reserved.

Arpack has been renamed to arpack-ng.

Copyright (c) 2001-2011 - Scilab Enterprises
Updated by Allan Cornet, Sylvestre Ledru.

Copyright (c) 2010 - Jordi GutiƩrrez Hermoso (Octave patch)

Copyright (c) 2007 - 

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