Using and Installing ARPACK

ARPACK is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems. After you downloaded the Fortran version of ARPACK and the patch unzip the files you got. That will create a directory named ARPACK. If you need further instructions please read the README file or the instructions. We will explain here in a few steps what has to be done to be able to compile ARPACK.

Note: For compilation of ARPACK we emphasise adding the compiler flag -fPIC. This is a definate requirement if we are compiling deal.II with shared libraries (which is the default). If we had preferred to be compiling deal.II without shared libraries, that's ok too; in that case we would do exactly the same thing as described above, but this time omitting the -fPIC flag from the scheme.

Try to run one of the examples and compare the output. How the output should look like is stated in the README that can be found in the EXAMPLES directory.

If that output you produced looks like it should you can proceed to comile deal.II with ARPACK.

Interfacing deal.II to ARPACK

To be able to use the interface of deal.II for ARPACK we then configure deal.II with the following additional option: --with-arpack=path/to/arpack