test_eigen

test_eigen, a Fortran90 code which generates random real symmetric and nonsymmetric matrices with known eigenvalues and eigenvectors, to test eigenvalue algorithms.

The current version of the code can only generate a symmetric or nonsymmetric matrix of arbitrary size, with real eigenvalues distributed according to a normal distribution whose mean and standard deviation are specified by the user in routines R8SYMM_GEN() and R8NSYMM_GEN().

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

test_eigen is available in a C version and a C++ version and a Fortran77 version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

test_eigen_test

arpack, a Fortran90 code which computes eigenvalues for large matrices;

eispack, a Fortran90 code which carries out eigenvalue computations; superseded by LAPACK;

jacobi_eigenvalue, a Fortran90 code which implements the Jacobi iteration for the iterative determination of the eigenvalues and eigenvectors of a real symmetric matrix.

lapack_eigen_test, a Fortran90 code which tests some of the LAPACK eigenvalue functions.

power_method, a Fortran90 code which carries out the power method for finding a dominant eigenvalue and its eigenvector.

test_matrix, a Fortran90 code which defines test matrices.

Reference:

1. Robert Gregory, David Karney,
   A Collection of Matrices for Testing Computational Algorithms,
   Wiley, 1969,
   ISBN: 0882756494,
   LC: QA263.G68.
2. Pete Stewart,
   Efficient Generation of Random Orthogonal Matrices With an Application to Condition Estimators,
   SIAM Journal on Numerical Analysis,
   Volume 17, Number 3, June 1980, pages 403-409.

Source Code:

• test_eigen.f90, the source code;
• test_eigen.sh, compiles the source code;