ccs_io

ccs_io, a Python 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 and a Python version.

Related Data and Programs:

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

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

Source Code:

• ccs_io.py a sample calling program.
• ccs_io.sh, runs the tests.
• ccs_io.txt, the output file.

• simple_base0_acc.txt, the values for a simple matrix in CCS form.
• simple_base0_ccc.txt, the (0-based) compressed column indices for a simple matrix in CCS form.
• simple_base0_icc.txt, the (0-based) row indices, for a simple matrix in CCS form.
• simple_base1_acc.txt, the values for a simple matrix in CCS form.
• simple_base1_ccc.txt, the (1-based) compressed column indices for a simple matrix in CCS form.
• simple_base1_icc.txt, the (1-based) row indices, for a simple matrix in CCS form.