r83s
r83s,
a MATLAB code which
carries out some basic linear algebra operations on R83S matrices
(real 64 bit precision tridiagonal scalar format).
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
r83s 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:
r83s_test
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 abs(X);

r8_uniform_01.m,
returns a pseudorandom R8.

r83s_cg.m,
solves an R83S system using the conjugate gradient method.

r83s_dif2.m,
returns the second difference matrix as an R83S.

r83s_jac_sl.m,
solves an R83S system using GaussSeidel iteration;

r83s_indicator.m,
sets up an R83S indicator matrix;

r83s_jac_sl.m,
solves an R83S system using Jacobi iteration;

r83s_mtv.m,
multiplies a vector times an R83S matrix;

r83s_mv.m,
multiplies an R83S matrix times a vector;

r83s_print.m,
prints an R83S matrix;

r83s_print_some.m,
prints some of an R83S matrix;

r83s_random.m,
randomizes an R83S matrix;

r83s_res.m,
returns the residual of an R83S linear system.

r83s_to_r8ge.m,
copies an R83S matrix to an R8GE matrix;

r83s_zeros.m,
zeros an R83s matrix;

r8ge_mtv.m,
computes the product A'*x for an R8GE matrix.

r8ge_mv.m,
computes the product A*x for an R8GE 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 indicator1 vector;

r8vec_norm.m,
computes the norm of an R8VEC.

r8vec_norm_affine.m,
sets the norm of the difference of two R8VEC's;

r8vec_print.m,
prints an R8VEC;

r8vec_uniform_01.m,
returns a random R8VEC;

r8vec2_print.m,
prints a pair R8VEC's;
Last revised on 17 August 2022.