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ARPACK is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems.

This is the arpack++/examples/umfpack/complex directory.

1) Examples included in this directory:

   This directory contains examples intended to show how to use
   ARPACK++ to solve complex eigenvalue problems in various
   computational modes in conjunction with the UMFPACK library.

   file              Description
   -----------       --------------------------------------------------

   ucompreg.cc       In this example a standard eigenvalue problem
                     is solved using the regular mode.

   ucompshf.cc       In this example a standard eigenvalue problem
                     is solved using the shift and invert mode.

   ucompgre.cc       In this example a generalized eigenvalue problem
                     is solved using the regular mode.

   ucompgsh.cc       In this example a generalized eigenvalue problem
                     is solved using the real shift and invert mode.


2) Compiling the examples:

   To compile and link all the above mentioned programs you just have
   to type "make all". Each example can also be compiled separately by
   using a specific command, such as "make ucompgsh".

   Because the examples that use invert modes require the solution of
   some linear systems, the UMFPACK library must be installed prior to
   compiling ucompshf, ucompgre and ucompgsh.


3) Running the examples:

   A program is executed by just typing its name (ucompgsh, for
   example).