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cc_io.html
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<html>
<head>
<title>
CC_IO - Read and Write Compressed Column (CC) Sparse Matrix Files
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
CC_IO <br> Read and Write Compressed Column (CC) Sparse Matrix Files
</h1>
<hr>
<p>
<b>CC_IO</b>
is a MATLAB library which
reads and writes compressed column (CC) sparse matrix files.
</p>
<p>
An MxN sparse matrix of NCC nonzero entries in compressed column format
is described by three items:
<ul>
<li>
<i>ccc()</i>, a list of N+1 compressed column indices.
</li>
<li>
<i>icc()</i>, a list of NCC row indices.
</li>
<li>
<i>acc()</i>, a list of NCC values.
</li>
</ul>
</p>
<p>
The nonzero entries of column J are stored in locations CCC(J) through
CCC(J+1)-1 of ICC and ACC.
</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>CC_IO</b> is available in
<a href = "../../c_src/cc_io/cc_io.html">a C version</a> and
<a href = "../../cpp_src/cc_io/cc_io.html">a C++ version</a> and
<a href = "../../f77_src/cc_io/cc_io.html">a FORTRAN77 version</a> and
<a href = "../../f_src/cc_io/cc_io.html">a FORTRAN90 version</a> and
<a href = "../../m_src/cc_io/cc_io.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../data/cc/cc.html">
CC</a>,
a data directory which
contains examples of the Compressed Column (CC)
sparse matrix file format;
</p>
<p>
<a href = "../../matlab_src/cc_to_st/cc_to_st.html">
CC_TO_ST</a>,
a MATLAB library which
converts a sparse matrix from compressed column (CC)
to sparse triple (ST) format.
</p>
<p>
<a href = "../../m_src/hb_io/hb_io.html">
HB_IO</a>,
a MATLAB library which
reads and writes sparse linear systems stored in the Harwell Boeing (HB)
format for sparse matrices.
</p>
<p>
<a href = "../../m_src/mm_io/mm_io.html">
MM_IO</a>,
a MATLAB library which
reads and writes sparse linear systems stored in the Matrix Market (MM)
format.
</p>
<p>
<a href = "../../m_src/st_io/st_io.html">
ST_IO</a>,
a MATLAB library which
reads and writes sparse linear systems stored in the Sparse Triplet (ST)
format.
</p>
<p>
<a href = "../../m_src/st_to_cc/st_to_cc.html">
ST_TO_CC</a>,
a MATLAB library which
converts sparse matrix data from Sparse Triplet (ST) format
to Compressed Column (CC) format.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "cc_data_read.m">cc_data_read.m</a>,
reads data about a sparse matrix in CC format.
</li>
<li>
<a href = "cc_header_read.m">cc_header_read.m</a>,
reads header information about a sparse matrix in CC format.
</li>
<li>
<a href = "cc_mv.m">cc_mv.m</a>,
multiplies a CC matrix times a vector.
</li>
<li>
<a href = "cc_print.m">cc_print.m</a>,
prints a sparse matrix in CC format.
</li>
<li>
<a href = "cc_print_some.m">cc_print_some.m</a>,
prints some of a sparse matrix in CC format.
</li>
<li>
<a href = "cc_write.m">cc_write.m</a>,
writes a sparse matrix in CC format to 3 files.
</li>
<li>
<a href = "file_row_count.m">file_row_count.m</a>,
counts the number of row records in a file.
</li>
<li>
<a href = "i4vec_data_read.m">i4vec_data_read.m</a>,
reads data from an I4VEC file.
</li>
<li>
<a href = "i4vec_dec.m">i4vec_dec.m</a>,
decrements an I4VEC.
</li>
<li>
<a href = "i4vec_inc.m">i4vec_inc.m</a>,
increments an I4VEC.
</li>
<li>
<a href = "i4vec_write.m">i4vec_write.m</a>,
writes an I4VEC file.
</li>
<li>
<a href = "r8vec_data_read.m">r8vec_data_read.m</a>,
reads data from an R8VEC file.
</li>
<li>
<a href = "r8vec_write.m">r8vec_write.m</a>,
writes an R8VEC file.
</li>
<li>
<a href = "timestamp.m">timestamp.m</a>,
prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "cc_io_test.m">cc_io_test.m</a>
a sample calling program.
</li>
<li>
<a href = "cc_io_test01.m">cc_io_test01.m</a>
writes a CC matrix to 3 files.
</li>
<li>
<a href = "cc_io_test02.m">cc_io_test02.m</a>
reads a CC matrix from 3 files.
</li>
<li>
<a href = "cc_io_test_output.txt">cc_io_test_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
Test #1 and #2 write and read back the information for the "simple"
5x5 matrix with 12 nonzero entries. There are files associated with this.
<ul>
<li>
<a href = "simple_acc.txt">simple_acc.txt</a>, the values.
</li>
<li>
<a href = "simple_ccc.txt">simple_ccc.txt</a>, the (0-based) compressed
column indices.
</li>
<li>
<a href = "simple_icc.txt">simple_icc.txt</a>, the (0-based) row indices.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../m_src.html">
the MATLAB source codes</a>.
</p>
<hr>
<i>
Last revised on 19 July 2014.
</i>
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