**arpack_test**,
FORTRAN90 codes which
call arpack, which
computes eigenvalues and eigenvectors of large matrices.

arpack, a FORTRAN90 code which computes eigenvalues for large matrices, which includes a reverse communication (RC) feature, by Richard Lehoucq, Danny Sorensen, Chao Yang;

**SSSIMP** is a simple symmetric test problem:

- sssimp.f90, a sample calling program.
- sssimp.txt, the output file.

**SNSIMP** is a simple nonsymmetric test problem:

- snsimp.f90, a sample calling program.
- snsimp.txt, the output file.