Added arpack with bindings from scipy sandbox.
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arpack/README
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This is the ARPACK package from
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http://www.caam.rice.edu/software/ARPACK/
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Specifically the files are from
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http://www.caam.rice.edu/software/ARPACK/SRC/arpack96.tar.gz
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with the patch
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http://www.caam.rice.edu/software/ARPACK/SRC/patch.tar.gz
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The ARPACK README is at
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http://www.caam.rice.edu/software/ARPACK/SRC/readme.arpack
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---
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ARPACK is a collection of Fortran77 subroutines designed to solve large
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scale eigenvalue problems.
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The package is designed to compute a few eigenvalues and corresponding
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eigenvectors of a general n by n matrix A. It is most appropriate for large
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sparse or structured matrices A where structured means that a matrix-vector
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product w <- Av requires order n rather than the usual order n**2 floating
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point operations. This software is based upon an algorithmic variant of the
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Arnoldi process called the Implicitly Restarted Arnoldi Method (IRAM). When
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the matrix A is symmetric it reduces to a variant of the Lanczos process
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called the Implicitly Restarted Lanczos Method (IRLM). These variants may be
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viewed as a synthesis of the Arnoldi/Lanczos process with the Implicitly
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Shifted QR technique that is suitable for large scale problems. For many
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standard problems, a matrix factorization is not required. Only the action
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of the matrix on a vector is needed. ARPACK software is capable of solving
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large scale symmetric, nonsymmetric, and generalized eigenproblems from
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significant application areas. The software is designed to compute a few (k)
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eigenvalues with user specified features such as those of largest real part
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or largest magnitude. Storage requirements are on the order of n*k locations.
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No auxiliary storage is required. A set of Schur basis vectors for the desired
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k-dimensional eigen-space is computed which is numerically orthogonal to working
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precision. Numerically accurate eigenvectors are available on request.
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Important Features:
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o Reverse Communication Interface.
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o Single and Double Precision Real Arithmetic Versions for Symmetric,
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Non-symmetric, Standard or Generalized Problems.
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o Single and Double Precision Complex Arithmetic Versions for Standard
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or Generalized Problems.
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o Routines for Banded Matrices - Standard or Generalized Problems.
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o Routines for The Singular Value Decomposition.
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o Example driver routines that may be used as templates to implement
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numerous Shift-Invert strategies for all problem types, data types
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and precision.
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---
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The ARPACK license is BSD-like.
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http://www.caam.rice.edu/software/ARPACK/RiceBSD.doc
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---
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Rice BSD Software License
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Permits source and binary redistribution of the software ARPACK and
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P_ARPACK for both non-commercial and commercial use.
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Copyright (©) 2001, Rice University
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Developed by D.C. Sorensen, R.B. Lehoucq, C. Yang, and K. Maschhoff.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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. If you modify the source for these routines we ask that you change the
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name of the routine and comment the changes made to the original.
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. Written notification is provided to the developers of intent to use
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this software. Also, we ask that use of ARPACK is properly cited in
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any resulting publications or software documentation.
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. Neither the name of Rice University (RICE) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY RICE AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL RICE OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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