MM_IO
Matrix Market - Read and Write Utilities

MM_IO is a C library which reads and writes files in the Matrix Market format.

Related Data and Programs:

MM is a data directory which contains a description and examples of the Matrix Market format for storing matrices.

MM_IO is available in a C version and a FORTRAN90 version and a MATLAB version.

MM_TO_MSM is a MATLAB program which reads a Matrix Market file defining a sparse matrix, and creates a corresponding MATLAB sparse matrix data structure.

MSM_TO_MM, a MATLAB program which writes a MATLAB sparse matrix to a Matrix Market file;

TEMPLATES is a MATLAB library which performs the iterative solution of large sparse linear systems. It includes a routine mm_to_msm which can read a Matrix Market file and store it as a MATLAB sparse matrix.

Reference:

1. Ronald Boisvert, Roldan Pozo, Karin Remington,
   The Matrix Market Exchange Formats: Initial Design,
   National Institute of Standards and Technology,
   NISTIR 5935, December 1996,
   Available online at ../../pdf/mm_format.pdf
2. http://math.nist.gov/MatrixMarket/, the Matrix Market web site.

Source Code:

• mm_io.c, the source code.
• mm_io.h, the include file.
• mm_io.csh, commands to compile the source code.

Examples and Tests:

• mm_io_prb.c a sample calling program.
• mm_io_prb.csh, commands to compile and run the sample program.
• mm_io_prb_output.txt, the output file.
• matrix_05_05_arg.txt, a 5 by 5 matrix in ARRAY REAL GENERAL form, read by some routines, and written by others.
• matrix_05_05_crg.txt, a 5 by 5 matrix in COORDINATE REAL GENERAL form, read by some routines, and written by others.

List of Routines:

• MM_IS_VALID checks whether the matrix code is valid or not.
• MM_READ_BANNER reads the header line of an MM file.
• MM_READ_MTX_ARRAY_SIZE reads the size line of an MM array file.
• MM_READ_MTX_CRD reads the values in an MM coordinate file.
• MM_READ_MTX_CRD_DATA reads the values in an MM coordinate file.
• MM_READ_MTX_CRD_ENTRY ???
• MM_READ_MTX_CRD_SIZE reads the size line of an MM coordinate file.
• MM_READ_UNSYMMETRIC_SPARSE ???
• MM_STRDUP creates a new copy of a string.
• MM_TYPECODE_TO_STR converts the internal typecode to an MM header string.
• MM_WRITE_BANNER writes the header line of an MM file.
• MM_WRITE_MTX_ARRAY_SIZE writes the size line of an MM array file.
• MM_WRITE_MTX_CRD writes an MM coordinate file.
• MM_WRITE_MTX_CRD_SIZE writes the size line of an MM coordinate file.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the C source codes.