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      PLASMA_MATRIX - Demonstrate Use of Harwell-Boeing Sparse Matrix Format
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      PLASMA_MATRIX <br> Demonstrate Use of Harwell-Boeing Sparse Matrix Format
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    <p>
      <b>PLASMA_MATRIX</b> 
      is a MATLAB library which 
      demonstrates how a MATLAB sparse matrix can be written to a
      Harwell-Boeing sparse matrix file for storage or transfer,
      and then later retrieved.
    </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>

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      Languages:
    </h3>

    <p>
      <b>PLASMA_MATRIX</b> is available in
      <a href = "../../m_src/plasma_matrix/plasma_matrix.html">a MATLAB version</a>.
    </p>

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      Related Data and Programs:
    </h3>

    <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 Sparse Matrix format.
    </p>

    <p>
      <a href = "../../m_src/hb_to_msm/hb_to_msm.html">
      HB_TO_MSM</a>,
      a MATLAB program which
      converts a Harwell Boeing sparse matrix to
      MATLAB sparse matrix format.
    </p>

    <p>
      <a href = "../../m_src/mm_to_hb/mm_to_hb.html">
      MM_TO_HB</a>,
      a MATLAB program which
      reads the sparse matrix information from an MM Matrix Market file 
      and writes a corresponding HB Harwell Boeing file.
    </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/msm_to_hb/msm_to_hb.html">
      MSM_TO_HB</a>,
      a MATLAB program which
      writes a MATLAB sparse matrix to a Harwell Boeing (HB) file,
      by Xiaoye Li.
    </p>

    <p>
      <a href = "../../m_src/msm_to_mm/msm_to_mm.html">
      MSM_TO_MM</a>, 
      a MATLAB program which
      writes a MATLAB sparse matrix to a Matrix Market (MM) file;
    </p>

    <p>
      <a href = "../../m_src/st_to_hb/st_to_hb.html">
      ST_TO_HB</a>,
      a MATLAB program which 
      converts a sparse matrix file from ST format to 
      Harwell Boeing (HB) format;
    </p>

    <p>
      <a href = "../../m_src/test_mat/test_mat.html">
      TEST_MAT</a>,
      a MATLAB library which
      defines test matrices with known inverses,
      determinants, eigenvalues and so on.
    </p>

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      Author:
    </h3>

    <p>
      James Cheung wrote the code that defines the plasma matrix.
    </p>

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      Reference:
    </h3>

    <p>
      <ol>
        <li>
          Iain Duff, Roger Grimes, John Lewis,<br>
          User's Guide for the Harwell-Boeing Sparse Matrix Collection,<br>
          October 1992.
        </li>
      </ol>
    </p>

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      Source Code:
    </h3>

    <p>
      <ul>
        <li>
          <a href = "hb_to_msm.m">hb_to_msm.m</a>, 
          creates a MATLAB Sparse matrix from data in a 
          Harwell Boeing Sparse Matrix file.
        </li>
        <li>
          <a href = "msm_to_hb.m">msm_to_hb.m</a>, 
          writes a MATLAB Sparse matrix to a Harwell Boeing Sparse Matrix
          file.
        </li>
        <li>
          <a href = "plasma_matrix.m">plasma_matrix.m</a>, 
          computes a jacobian matrix J and residual function F associated
          with a plasma simulation on an N by N grid.
        </li>
        <li>
          <a href = "timestamp.m">timestamp.m</a>, 
          prints the current YMDHMS date as a timestamp.
        </li>
      </ul>
    </p>

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      Examples and Tests:
    </h3>

    <p>
      <ul>
        <li>
          <a href = "plasma_matrix_test.m">plasma_matrix_test.m</a>,
          runs the tests.
        </li>
        <li>
          <a href = "plasma_matrix_test_output.txt">plasma_matrix_test_output.txt</a>,
          the output file.
        </li>
        <li>
          <a href = "plasma_matrix_test01.m">plasma_matrix_test01.m</a>,
          computes a plasma matrix, writes it to a file, and retrieves it.
        </li>
        <li>
          <a href = "msm_to_hb_test01.hb">msm_to_hb_test01.hb</a>,
          the HB file created by the test.
        </li>
      </ul>
    </p>

    <p>
      The first test uses N = 5.
      <ul>
        <li>
          <a href = "plasma_5_sparsity.png">plasma_5_sparsity.png</a>,
          the matrix sparsity graph from MATLAB's spy() command.
        </li>
        <li>
          <a href = "plasma_5_rua.txt">plasma_5_rua.txt</a>,
          the Harwell-Boeing sparse matrix file.
        </li>
      </ul>
    </p>

    <p>
      The second test uses N = 100.
      <ul>
        <li>
          <a href = "plasma_100_sparsity.png">plasma_100_sparsity.png</a>,
          the matrix sparsity graph from MATLAB's spy() command.
        </li>
        <li>
          <a href = "plasma_100_rua.txt">plasma_100_rua.txt</a>,
          the Harwell-Boeing sparse matrix file.
        </li>
      </ul>
    </p>

    <p>
      You can go up one level to <a href = "../m_src.html">
      the MATLAB source codes</a>.
    </p>

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    <i>
      Last revised on 21 January 2014.
    </i>

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