**companion_matrix_test**,
a Fortran90 code which
calls companion_matrix(), which
computes the companion matrix for a polynomial, in a variety of bases.

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companion_matrix, a Fortran90 code which computes the companion matrix for a polynomial, in a variety of bases.

- companion_matrix_test.f90 calls all the tests;
- companion_matrix_test.sh runs all the tests;
- companion_matrix_test.txt the output file;