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<html>
<head>
<title>
MM_IO - Matrix Market - Read and Write Utilities
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
MM_IO <br> Matrix Market <br> Read and Write Utilities
</h1>
<hr>
<p>
<b>MM_IO</b>
is a FORTRAN90 library which
reads and writes files in the Matrix Market format.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>MM_IO</b> is available in
<a href = "../../c_src/mm_io/mm_io.html">a C version</a> and
<a href = "../../f_src/mm_io/mm_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/mm_io/mm_io.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/dlap_io/dlap_io.html">
DLAP_IO</a>,
a FORTRAN90 library which
reads and writes files
describing sparse matrices used by DLAP.
</p>
<p>
<a href = "../../f_src/hb_io/hb_io.html">
HB_IO</a>,
a FORTRAN90 library which
reads and writes sparse matrices stored in the Harwell-Boeing format.
</p>
<p>
<a href = "../../f_src/hb_to_st/hb_to_st.html">
HB_TO_ST</a>,
a FORTRAN90 program which
converts the sparse matrix information stored in a Harwell-Boeing
file into a sparse triplet file.
</p>
<p>
<a href = "../../data/mm/mm.html">
MM</a>,
a data directory which
contains a description and
examples of the Matrix Market format for storing matrices.
</p>
<p>
<a href = "../../m_src/mm_to_msm/mm_to_msm.html">
MM_TO_MSM</a>,
a MATLAB program which
reads a Matrix Market file defining a sparse matrix, and creates
a corresponding MATLAB sparse matrix data structure.
</p>
<p>
<a href = "../../m_src/templates/templates.html">
TEMPLATES</a>,
a MATLAB library which
performs the iterative solution of large sparse linear systems.
It includes a routine <b>mm_to_msm</b> which
can read a Matrix Market file and store it as a MATLAB sparse
matrix.
</p>
<p>
<a href = "../../f_src/test_mat/test_mat.html">
TEST_MAT</a>,
a FORTRAN90 library which
defines various test matrices.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Ronald Boisvert, Roldan Pozo, Karin Remington,<br>
The Matrix Market Exchange Formats: Initial Design,<br>
National Institute of Standards and Technology,<br>
NISTIR 5935, December 1996.
</li>
<li>
<a href = "http://math.nist.gov/MatrixMarket/">
http://math.nist.gov/MatrixMarket/</a>,
the Matrix Market web site.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "mm_io.f90">mm_io.f90</a>, the source code.
</li>
<li>
<a href = "mm_io.sh">mm_io.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "mm_io_prb.f90">mm_io_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "mm_io_prb.sh">mm_io_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "mm_io_prb_output.txt">mm_io_prb_output.txt</a>,
the output file.
</li>
<li>
<a href = "matrix_05_05_crg.txt">matrix_05_05_crg.txt</a>,
a 5 by 5 matrix in COORDINATE REAL GENERAL form read
by some routines, and written by others.
</li>
<li>
<a href = "wathen_29_29_adg.txt">wathen_29_28_adg.txt</a>,
a 29 by 29 matrix in ARRAY DOUBLE GENERAL form written by
one of the test routines.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>MM_COMMENT_PRINT</b> prints a comment from a Matrix Market file.
</li>
<li>
<b>MM_COMMENT_READ</b> reads a comment from a Matrix Market file.
</li>
<li>
<b>MM_COMMENT_WRITE</b> writes a comment to a Matrix Market file.
</li>
<li>
<b>MM_FILE_READ</b> reads data from a Matrix Market file.
</li>
<li>
<b>MM_FILE_WRITE</b> writes data to a Matrix Market file.
</li>
<li>
<b>MM_HEADER_CHECK</b> checks the header strings for a Matrix Market file.
</li>
<li>
<b>MM_HEADER_PRINT</b> prints header information from a Matrix Market file.
</li>
<li>
<b>MM_HEADER_READ</b> reads the header line from a Matrix Market file.
</li>
<li>
<b>MM_HEADER_WRITE</b> prints header information to a Matrix Market file.
</li>
<li>
<b>MM_NNZ_SET</b> sets the value of NNZ for the ARRAY representation.
</li>
<li>
<b>MM_SIZE_PRINT</b> prints size information from a Matrix Market file.
</li>
<li>
<b>MM_SIZE_READ_FILE</b> reads size information from a Matrix Market file.
</li>
<li>
<b>MM_SIZE_READ_STRING</b> reads size information from a string.
</li>
<li>
<b>MM_SIZE_WRITE</b> writes size information to a Matrix Market file.
</li>
<li>
<b>MM_VALUES_PRINT</b> prints the matrix values of a Matrix Market file.
</li>
<li>
<b>MM_VALUES_PRINT_SOME</b> prints some matrix values of a Matrix Market file.
</li>
<li>
<b>MM_VALUES_READ</b> reads matrix values from a Matrix Market file.
</li>
<li>
<b>MM_VALUES_WRITE</b> writes matrix values to a Matrix Market file.
</li>
<li>
<b>S_EQI</b> is a case insensitive comparison of two strings for equality.
</li>
<li>
<b>S_NEQI</b> compares two strings for non-equality, ignoring case.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_W_NEXT</b> "reads" words from a string, one at a time.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 27 November 2006.
</i>
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