#
r83_np

**r83_np**,
a C 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.

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Licensing:

The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.

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Languages:

**r83_np** is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
a Python version.

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Related Data and Programs:

r83_np_test

linear_algebra,
C codes which
carry out various linear algebra operations for matrices
stored in a variety of formats.

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Source Code:

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Last revised on 15 August 2022.
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