r83t
r83t,
a MATLAB code which
carries out some basic linear algebra operations on R83T matrices
(real 64 bit precision tridiagonal Mx3 format).
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
r83t is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
a Python version.
Related Data and Programs:
r83t,
a MATLAB library which
carries out some basic linear algebra operations on R83T matrices
(real 64 bit precision tridiagonal Mx3 format).
linear_algebra,
MATLAB codes which
carry out various linear algebra operations for matrices
stored in a variety of formats.
Source Code:

i4_log_10.m,
returns the integer part of the logarithm base 10 of an I4;

r8_uniform_01.m,
returns a unit pseudorandom R8;

r83t_cg.m,
uses the conjugate gradient method on an R83T system.

r83t_dif2.m,
returns the DIF2 matrix in R83T format.

r83t_gs_sl.m,
uses the Gauss Seidel iterative method on an R83T system.

r83t_indicator.m,
returns the indicator matrix in R83T format.

r83t_jac_sl.m,
uses the Jacobi iterative method on an R83T system.

r83t_mtv.m,
multiplies the transpose of an R83T matrix times an R8VEC.

r83t_mv.m,
multiplies an R83T matrix times an R8VEC.

r83t_print.m,
prints an R83T matrix.

r83t_print_some.m,
prints some of an R83T matrix.

r83t_random.m,
returns a random R83T matrix;

r83t_res.m,
computes the residual R = BA*X for R83T matrices.

r83t_to_r8ge.m,
converts an R83T matrix to R8GE format.

r83t_zeros.m,
zeros an R83T matrix;

r8ge_print.m,
prints an R8GE matrix;

r8ge_print_some.m,
prints some of an R8GE matrix;

r8vec_indicator1.m,
sets an R8VEC to the indicator vector;

r8vec_print.m,
prints an R8VEC;

r8vec_uniform_01.m,
returns a unit pseudorandom R8VEC.

timestamp.m,
prints the current YMDHMS date as a timestamp;
Last revised on 17 August 2022.