r8crs

r8crs, an Octave code which carries out linear algebra operations for R8CRS matrices (real, 64 bit, compressed row storage (CRS) format).

Licensing:

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

Languages:

r8crs is available in a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

r8crs_test

crs, a dataset directory which contains examples of the compressed row storage (crs) sparse matrix file format;

crs_io, an Octave code which reads and writes sparse linear systems stored in the Compressed Row Storage (CRS) format.

ge_to_crs, an Octave code which converts a matrix from general (ge) to compressed row storage (crs) format.

mgmres, an Octave code which applies the restarted generalized minimum residual (gmres) algorithm to solve a sparse linear system, using compressed row storage (crs) or sparse triplet (st) format, by lili ju.

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);
• r8crs_dif2.m, returns an R8SR second difference matrix;
• r8crs_indicator.m, returns an R8SR indicator matrix;
• r8crs_mtv.m, multiplies an R8SR matrix tranposed times a vector;
• r8crs_mv.m, multiplies an R8SR matrix times a vector;
• r8crs_print.m, prints an R8SR matrix;
• r8crs_print_some.m, prints some of an R8SR matrix;
• r8crs_random.m, randomizes an R8SR matrix;
• r8crs_to_r8ge.m, copies an R8SR matrix to an R8GE matrix;
• r8crs_zeros.m, zeros an R8SR matrix;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8ge_to_r8crs.m, converts an R8GE matrix to R8CRS format;
• r8vec_print.m, prints an R8VEC;