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 Gauss-Seidel 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;