ccs_io

ccs_io, a MATLAB code which reads and writes Compressed Column Storage (CCS) sparse matrix files.

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

• ccc(), a list of N+1 compressed column indices.
• icc(), a list of NCC row indices.
• acc(), a list of NCC values.

The nonzero entries of column J are stored in locations CCC(J) through CCC(J+1)-1 of ICC and ACC.

Licensing:

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

Languages:

ccs_io is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

ccs_io_test

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

ccs_to_st, a MATLAB code which converts a sparse matrix from Compressed Column Storage (CCS) to sparse triple (ST) format.

hb_io, a MATLAB code which reads and writes sparse linear systems stored in the Harwell Boeing (HB) format for sparse matrices.

mm_io, a MATLAB code which reads and writes sparse linear systems stored in the Matrix Market (MM) format.

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

st_to_ccs, a MATLAB code which converts sparse matrix data from Sparse Triplet (ST) format to Compressed Column Storage (CCS) format.

Source Code:

• ccs_mv.m, multiplies a CCS matrix times a vector.
• ccs_print.m, prints a sparse matrix in CCS format.
• ccs_print_some.m, prints some of a sparse matrix in CCS format.
• ccs_read.m, reads sparse matrix data from 3 files in CCS format.
• ccs_write.m, writes a sparse matrix in CCS format to 3 files.