CC_IO
Read and Write Compressed Column (CC) Sparse Matrix Files

CC_IO is a MATLAB library which reads and writes compressed column (CC) 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 GNU LGPL license.

Languages:

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

Related Data and Programs:

CC, a data directory which contains examples of the Compressed Column (CC) sparse matrix file format;

cc_io_test

CC_TO_ST, a MATLAB library which converts a sparse matrix from compressed column (CC) to sparse triple (ST) format.

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

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

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

ST_TO_CC, a MATLAB library which converts sparse matrix data from Sparse Triplet (ST) format to Compressed Column (CC) format.

Source Code:

• cc_data_read.m, reads data about a sparse matrix in CC format.
• cc_header_read.m, reads header information about a sparse matrix in CC format.
• cc_mv.m, multiplies a CC matrix times a vector.
• cc_print.m, prints a sparse matrix in CC format.
• cc_print_some.m, prints some of a sparse matrix in CC format.
• cc_write.m, writes a sparse matrix in CC format to 3 files.
• file_row_count.m, counts the number of row records in a file.
• i4vec_data_read.m, reads data from an I4VEC file.
• i4vec_dec.m, decrements an I4VEC.
• i4vec_inc.m, increments an I4VEC.
• i4vec_write.m, writes an I4VEC file.
• r8vec_data_read.m, reads data from an R8VEC file.
• r8vec_write.m, writes an R8VEC file.
• timestamp.m, prints the current YMDHMS date as a time stamp.