r83t

r83t, an Octave 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 Octave 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 = B-A*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;