r83_np_test, a FORTRAN90 code which carries out some basic linear algebra operations on R83_NP matrices (real 64 bit precision tridiagonal 3xN format, nonpivoting factorization).
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r83_np, a FORTRAN90 code which contains linear algebra routines for R83_NP matrices (real, 64 bit, tridiagonal 3xN format, nonpivoting factorization).