r8sd

r8sd, a MATLAB library which carries out some basic linear algebra operations on R8SD matrices (real 64 bit precision symmetric diagonal format).

Licensing:

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

Languages:

r8sd 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:

r8sd_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, is a uniform random number generator;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8sd_cg.m, uses the conjugate gradient method on an R8SD linear system.
• r8sd_dif2.m, returns the DIF2 matrix in R8SD format.
• r8sd_indicator.m, returns an R8SD indicator matrix;
• r8sd_mv.m, multiplies an R8SD matrix times a vector;
• r8sd_print.m, prints an R8SD matrix;
• r8sd_print_some.m, prints some of an R8SD matrix;
• r8sd_random.m, randomizes an R8SD matrix;
• r8sd_res.m, computes the residual R = B-A*X for R8SD matrices.
• r8sd_to_r8ge.m, copies an R8SD matrix to an R8GE matrix;
• r8sd_zeros.m, zeros an R8SD matrix;
• r8vec_indicator1.m, sets an R8VEC to the indicator1 vector;
• r8vec_print.m, prints an R8VEC;
• r8vec_print_some.m, prints some of an R8VEC;