MM_IO
Matrix Market
Read and Write Utilities

MM_IO, a MATLAB library which reads and writes files in the Matrix Market (MM) file format.

Licensing:

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

Languages:

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

Related Data and Programs:

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

DLAP_IO, a MATLAB library which reads and writes DLAP sparse matrix files;

HB_IO, a MATLAB library which reads and writes sparse matrices stored in the Harwell-Boeing format.

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

mm_io_test

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

MM_TO_ST, a MATLAB program which reads the sparse matrix information from an MM Matrix Market file and writes a corresponding ST Sparse Triplet file.

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

ST_TO_MM, a MATLAB program which converts a sparse matrix file from ST format to MM format (Matrix Market format);

TEST_MAT, a MATLAB library which defines various test matrices.

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

Source Code:

• ch_cap.m capitalizes a single character.
• mm_comment_print.m prints a comment line from a Matrix Market file.
• mm_comment_write.m writes a comment line to a Matrix Market file.
• mm_file_read.m reads an entire Matrix Market file.
• mm_file_write.m writes an entire Matrix Market file.
• mm_header_check.m checks the header information of a Matrix Market file.
• mm_header_print.m prints header information from a Matrix Market file.
• mm_header_read.m reads the header information from a Matrix Market file.
• mm_header_write.m writes the header information to a Matrix Market file.
• mm_nnz_set.m sets the value of NNZ in certain cases.
• mm_size_print.m prints size information from a Matrix Market file.
• mm_size_read_file.m reads the size information from a Matrix Market file.
• mm_size_read_string.m reads the size information from a string that has been read from a Matrix Market file.
• mm_size_write.m writes the size information to a Matrix Market file.
• mm_values_print.m prints the matrix value information from a Matrix Market file.
• mm_values_print_some.m prints some of the matrix value information from a Matrix Market file.
• mm_values_read.m reads the matrix value information from a Matrix Market file.
• mm_values_write.m writes the size information to a Matrix Market file.
• r8_to_c8.m constructs a C8 from two R8's.
• s_eqi.m is TRUE if two strings are equal, ignoring case and trailing blanks.
• s_len_trim.m returns the length of a string to the last nonblank.
• s_neqi.m is TRUE if two strings are not equal, ignoring case and trailing blanks.
• timestamp.m prints the YMDHMS date as a timestamp.