r83_np, a Fortran90 code which carries out some basic linear algebra operations on R83_NP matrices (real 64 bit precision tridiagonal 3xN format, nonpivoting factorization).
These utilities are distinguished by the fact that an LU factorization is attempted without the use of pivoting. Such an approach will fail if a zero pivot is encountered, and will generally not be as accurate as a pivoting factorization. It is only recommended in cases where pivoting is known to be unnecessary, such as for a symmetric positive definite matrix.
The information on this web page is distributed under the MIT license.
r83_np is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
linear_algebra, Fortran90 codes which carry out various linear algebra operations for matrices stored in a variety of formats.