crs_io

crs_io, a MATLAB code which reads and writes Compressed Row Storage (CRS) sparse matrix files.

An MxN sparse matrix of NZ nonzero entries in compressed row format is described by three items:

• row(), a list of N+1 compressed row indices.
• col(), a list of NZ column indices.
• val(), a list of NZ values.

The nonzero entries of row I are stored in locations ROW(I) through ROW(I+1)-1 of COL and VAL.

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

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

Related Data and Programs:

crs_io_test

ccs_io, a MATLAB code which reads and writes sparse linear systems stored in the Compressed Column Storage (CCS) format.

crs, a dataset directory which contains examples of the Compressed Column Storage (CCS) sparse matrix file format;

ge_to_crs, a MATLAB code which converts a matrix from General (GE) to Compressed Row Storage (CRS) format.

mgmres, a MATLAB 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.

r8crs, a MATLAB code which contains linear algebra routines for r8crs matrices (real, 64 bit, Compressed Row Storage (CRS) format).

st_io, a MATLAB code which reads and writes sparse linear systems stored in the Sparse Triplet (ST) format.

Source Code:

• crs_mv.m, multiplies a CRS matrix times a vector.
• crs_print.m, prints a sparse matrix in CRS format.
• crs_print_some.m, prints some of a sparse matrix in CRS format.
• crs_read.m, reads sparse matrix data from 3 files in CRS format.
• crs_write.m, writes a sparse matrix in CRS format to 3 files.