MM_IO
Matrix Market - Sparse Matrix Read and Write Utilities

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

Languages:

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

Related Data and Programs:

CC_IO, a C library which reads and writes sparse linear systems stored in the Compressed Column (CC) format.

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

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

SPARSE_DISPLAY, a C library which can read information defining a matrix of numbers and display the sparsity pattern or location of the nonzero elements using gnuplot. This operation is already available in the built-in MATLAB "spy" command.

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

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.
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.

Examples and Tests:

• mm_io_test.c a sample calling program.
• mm_io_test.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.