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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 C++ 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 matrix stored in the compressed column (CC) format.
</p>
<p>
<a href = "../../cpp_src/hb_io/hb_io.html">
HB_IO</a>,
a C++ library which
reads and writes sparse linear systems stored in the Harwell Boeing (HB)
format for sparse matrices.
</p>
<p>
<a href = "../../cpp_src/st_io/st_io.html">
ST_IO</a>,
a C++ library which
reads and writes sparse linear systems stored in the Sparse Triplet (ST)
format.
</p>
<p>
<a href = "../../cpp_src/cc_to_st/cc_to_st.html">
CC_TO_ST</a>,
a C++ library which
converts a sparse matrix from compressed column (CC)
to sparse triple (ST) format.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "cc_io.cpp">cc_io.cpp</a>, the source code.
</li>
<li>
<a href = "cc_io.hpp">cc_io.hpp</a>, the include file.
</li>
<li>
<a href = "cc_io.sh">cc_io.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "cc_io_prb.cpp">cc_io_prb.cpp</a>
a sample calling program.
</li>
<li>
<a href = "cc_io_prb.sh">cc_io_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "cc_io_prb_output.txt">cc_io_prb_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>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CC_DATA_READ</b> reads data about a sparse matrix in CC format.
</li>
<li>
<b>CC_HEADER_READ</b> reads header information about a sparse matrix in CC format.
</li>
<li>
<b>CC_PRINT</b> prints a sparse matrix in CC format.
</li>
<li>
<b>CC_PRINT_SOME</b> prints some of a sparse matrix in CC format.
</li>
<li>
<b>CC_WRITE</b> writes a sparse matrix in CC format to 3 files.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>I4VEC_DATA_READ</b> reads the data from an I4VEC file.
</li>
<li>
<b>I4VEC_DEC</b> decrements an I4VEC.
</li>
<li>
<b>I4VEC_INC</b> increments an I4VEC.
</li>
<li>
<b>I4VEC_WRITE</b> writes an I4VEC to a file.
</li>
<li>
<b>R8VEC_DATA_READ</b> reads the data from an R8VEC file.
</li>
<li>
<b>R8VEC_WRITE</b> writes an R8VEC file.
</li>
<li>
<b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
</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 = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 18 July 2014.
</i>
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