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<title>mrpt::math::CSparseMatrix::CholeskyDecomp Class Reference</title>
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<a href="#pub-methods">Public Member Functions</a> &#124;
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<!-- doxytag: class="mrpt::math::CSparseMatrix::CholeskyDecomp" --><!-- doxytag: inherits="mrpt::utils::CUncopiable" --><hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Auxiliary class to hold the results of a Cholesky factorization of a sparse matrix. </p>
<p>Usage example: </p>
<div class="fragment"><pre class="fragment">     <a class="code" href="classmrpt_1_1math_1_1_c_sparse_matrix.html#a5d836fcbf333fcd2e5fda9de14d4dad5" title="Create an initially empty sparse matrix, in the &quot;triplet&quot; form.">CSparseMatrix</a>  SM(100,100);
     SM.insert_entry(i,j, val); ...
     SM.compressFromTriplet();

     <span class="comment">// Do Cholesky decomposition:</span>
                <a class="code" href="classmrpt_1_1math_1_1_c_sparse_matrix.html#a5d836fcbf333fcd2e5fda9de14d4dad5" title="Create an initially empty sparse matrix, in the &quot;triplet&quot; form.">CSparseMatrix</a><a class="code" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a200be8e54166dffb89bab6392b714177" title="Constructor from a square definite-positive sparse matrix A, which can be use to solve Ax=b The actua...">::CholeskyDecomp</a>  CD(SM);
     CD.get_inverse();
     ...
</pre></div><dl class="note"><dt><b>Note:</b></dt><dd>Only the upper triangular part of the input matrix is accessed. </dd>
<dd>
This class was initially adapted from "robotvision", by Hauke Strasdat, Steven Lovegrove and Andrew J. Davison. See <a href="http://www.openslam.org/robotvision.html">http://www.openslam.org/robotvision.html</a> </dd>
<dd>
This class designed to be "uncopiable". </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd>The main class: <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html" title="A sparse matrix capable of efficient math operations (a wrapper around the CSparse library) The type ...">CSparseMatrix</a> </dd></dl>
</div>
<p><code>#include &lt;<a class="el" href="_c_sparse_matrix_8h_source.html">mrpt/math/CSparseMatrix.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for mrpt::math::CSparseMatrix::CholeskyDecomp:</div>
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<div class="center"><img src="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp__inherit__graph.png" border="0" usemap="#mrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp_inherit__map" alt="Inheritance graph"/></div>
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<area shape="rect" id="node2" href="classmrpt_1_1utils_1_1_c_uncopiable.html" title="The base class of classes that cannot be copied: compile&#45;time errors will be issued on any copy opera..." alt="" coords="69,5,232,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>

<p><a href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a200be8e54166dffb89bab6392b714177">CholeskyDecomp</a> (const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a> &amp;A)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructor from a square definite-positive sparse matrix A, which can be use to solve Ax=b The actual Cholesky decomposition takes places in this constructor.  <a href="#a200be8e54166dffb89bab6392b714177"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a50c1e3a1edce68ea8a8e3c92cc9a191a">~CholeskyDecomp</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor.  <a href="#a50c1e3a1edce68ea8a8e3c92cc9a191a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespacemrpt_1_1math.html#a3814c2b868f059d6a7ab0d8ecd2311d6">CMatrixDouble</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a683ec672fe111c51f8077dfe91a02b5b">get_L</a> () const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Return the L matrix (L*L' = M), as a dense matrix.  <a href="#a683ec672fe111c51f8077dfe91a02b5b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a4e4ca44fbf5e057cbbe3550e0a2e7c41">get_L</a> (<a class="el" href="namespacemrpt_1_1math.html#a3814c2b868f059d6a7ab0d8ecd2311d6">CMatrixDouble</a> &amp;out_L) const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Return the L matrix (L*L' = M), as a dense matrix.  <a href="#a4e4ca44fbf5e057cbbe3550e0a2e7c41"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a68d1c1d3ac8e5636d61cf9ad6d6ef438">backsub</a> (const <a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;b) const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Return the vector from a back-substitution step that solves: Ux=b.  <a href="#a68d1c1d3ac8e5636d61cf9ad6d6ef438"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a353252658a5a501ade8cad7e7c03151f">backsub</a> (const <a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;b, <a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;result_x) const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Return the vector from a back-substitution step that solves: Ux=b.  <a href="#a353252658a5a501ade8cad7e7c03151f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a0089aca42cb44a486ebacf3d7834eb69">update</a> (const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a> &amp;new_SM)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Update the Cholesky factorization from an updated vesion of the original input, square definite-positive sparse matrix.  <a href="#a0089aca42cb44a486ebacf3d7834eb69"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pri-attribs"></a>
Private Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="cs_8h.html#afdd66916fadd9fd39cd279717aa5c6b9">css</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a93f179dd287779e018e95829cf3a5c68">m_symbolic_structure</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="cs_8h.html#aa81f48a471a94557a00da42ceb21dc68">csn</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a38a4c14675e0045a800633651774b90d">m_numeric_structure</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#ac391e5c78a90a580d501f8141364d727">m_originalSM</a></td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">A const reference to the original matrix used to build this decomposition.  <a href="#ac391e5c78a90a580d501f8141364d727"></a><br/></td></tr>
</table>
<hr/><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" id="a200be8e54166dffb89bab6392b714177"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::CholeskyDecomp" ref="a200be8e54166dffb89bab6392b714177" args="(const CSparseMatrix &amp;A)" -->
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          <td class="memname">mrpt::math::CSparseMatrix::CholeskyDecomp::CholeskyDecomp </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a> &amp;&#160;</td>
          <td class="paramname"><em>A</em></td><td>)</td>
          <td></td>
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<div class="memdoc">

<p>Constructor from a square definite-positive sparse matrix A, which can be use to solve Ax=b The actual Cholesky decomposition takes places in this constructor. </p>
<dl class="note"><dt><b>Note:</b></dt><dd>Only the upper triangular part of the matrix is accessed. </dd></dl>
<dl><dt><b>Exceptions:</b></dt><dd>
  <table class="exception">
    <tr><td class="paramname"><a class="el" href="classstd_1_1runtime__error.html" title="STL class.">std::runtime_error</a></td><td>On non-square input matrix. </td></tr>
    <tr><td class="paramname"><a class="el" href="classmrpt_1_1math_1_1_c_exception_not_def_pos.html" title="Used in mrpt::math::CSparseMatrix.">mrpt::math::CExceptionNotDefPos</a></td><td>On non-definite-positive matrix as input. </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="a50c1e3a1edce68ea8a8e3c92cc9a191a"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::~CholeskyDecomp" ref="a50c1e3a1edce68ea8a8e3c92cc9a191a" args="()" -->
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          <td class="memname">virtual mrpt::math::CSparseMatrix::CholeskyDecomp::~CholeskyDecomp </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td><code> [virtual]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Destructor. </p>

</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a68d1c1d3ac8e5636d61cf9ad6d6ef438"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::backsub" ref="a68d1c1d3ac8e5636d61cf9ad6d6ef438" args="(const mrpt::vector_double &amp;b) const " -->
<div class="memitem">
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          <td class="memname"><a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> mrpt::math::CSparseMatrix::CholeskyDecomp::backsub </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;&#160;</td>
          <td class="paramname"><em>b</em></td><td>)</td>
          <td> const<code> [inline]</code></td>
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<p>Return the vector from a back-substitution step that solves: Ux=b. </p>

<p>Definition at line <a class="el" href="_c_sparse_matrix_8h_source.html#l00368">368</a> of file <a class="el" href="_c_sparse_matrix_8h_source.html">CSparseMatrix.h</a>.</p>

<p>References <a class="el" href="_c_sparse_matrix_8h_source.html#l00368">backsub()</a>.</p>

<p>Referenced by <a class="el" href="_c_sparse_matrix_8h_source.html#l00368">backsub()</a>.</p>

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</div>
<a class="anchor" id="a353252658a5a501ade8cad7e7c03151f"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::backsub" ref="a353252658a5a501ade8cad7e7c03151f" args="(const mrpt::vector_double &amp;b, mrpt::vector_double &amp;result_x) const " -->
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          <td class="memname">void mrpt::math::CSparseMatrix::CholeskyDecomp::backsub </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;&#160;</td>
          <td class="paramname"><em>b</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="namespacemrpt.html#a4a6aab2c98368ca6b554c04f8fe84cfb">mrpt::vector_double</a> &amp;&#160;</td>
          <td class="paramname"><em>result_x</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
      </table>
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<div class="memdoc">

<p>Return the vector from a back-substitution step that solves: Ux=b. </p>

</div>
</div>
<a class="anchor" id="a683ec672fe111c51f8077dfe91a02b5b"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::get_L" ref="a683ec672fe111c51f8077dfe91a02b5b" args="() const " -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="namespacemrpt_1_1math.html#a3814c2b868f059d6a7ab0d8ecd2311d6">CMatrixDouble</a> mrpt::math::CSparseMatrix::CholeskyDecomp::get_L </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td> const<code> [inline]</code></td>
        </tr>
      </table>
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<p>Return the L matrix (L*L' = M), as a dense matrix. </p>

<p>Definition at line <a class="el" href="_c_sparse_matrix_8h_source.html#l00362">362</a> of file <a class="el" href="_c_sparse_matrix_8h_source.html">CSparseMatrix.h</a>.</p>

<p>References <a class="el" href="_c_sparse_matrix_8h_source.html#l00362">get_L()</a>.</p>

<p>Referenced by <a class="el" href="_c_sparse_matrix_8h_source.html#l00362">get_L()</a>.</p>

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</div>
<a class="anchor" id="a4e4ca44fbf5e057cbbe3550e0a2e7c41"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::get_L" ref="a4e4ca44fbf5e057cbbe3550e0a2e7c41" args="(CMatrixDouble &amp;out_L) const " -->
<div class="memitem">
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          <td class="memname">void mrpt::math::CSparseMatrix::CholeskyDecomp::get_L </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="namespacemrpt_1_1math.html#a3814c2b868f059d6a7ab0d8ecd2311d6">CMatrixDouble</a> &amp;&#160;</td>
          <td class="paramname"><em>out_L</em></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
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<p>Return the L matrix (L*L' = M), as a dense matrix. </p>

</div>
</div>
<a class="anchor" id="a0089aca42cb44a486ebacf3d7834eb69"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::update" ref="a0089aca42cb44a486ebacf3d7834eb69" args="(const CSparseMatrix &amp;new_SM)" -->
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          <td class="memname">void mrpt::math::CSparseMatrix::CholeskyDecomp::update </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a> &amp;&#160;</td>
          <td class="paramname"><em>new_SM</em></td><td>)</td>
          <td></td>
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<div class="memdoc">

<p>Update the Cholesky factorization from an updated vesion of the original input, square definite-positive sparse matrix. </p>
<p>NOTE: This new matrix MUST HAVE exactly the same sparse structure than the original one. </p>

</div>
</div>
<hr/><h2>Member Data Documentation</h2>
<a class="anchor" id="a38a4c14675e0045a800633651774b90d"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::m_numeric_structure" ref="a38a4c14675e0045a800633651774b90d" args="" -->
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      <table class="memname">
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          <td class="memname"><a class="el" href="cs_8h.html#aa81f48a471a94557a00da42ceb21dc68">csn</a>* <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a38a4c14675e0045a800633651774b90d">mrpt::math::CSparseMatrix::CholeskyDecomp::m_numeric_structure</a><code> [private]</code></td>
        </tr>
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<div class="memdoc">

<p>Definition at line <a class="el" href="_c_sparse_matrix_8h_source.html#l00346">346</a> of file <a class="el" href="_c_sparse_matrix_8h_source.html">CSparseMatrix.h</a>.</p>

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<a class="anchor" id="ac391e5c78a90a580d501f8141364d727"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::m_originalSM" ref="ac391e5c78a90a580d501f8141364d727" args="" -->
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          <td class="memname">const <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix.html">CSparseMatrix</a>* <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#ac391e5c78a90a580d501f8141364d727">mrpt::math::CSparseMatrix::CholeskyDecomp::m_originalSM</a><code> [private]</code></td>
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<p>A const reference to the original matrix used to build this decomposition. </p>

<p>Definition at line <a class="el" href="_c_sparse_matrix_8h_source.html#l00347">347</a> of file <a class="el" href="_c_sparse_matrix_8h_source.html">CSparseMatrix.h</a>.</p>

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<a class="anchor" id="a93f179dd287779e018e95829cf3a5c68"></a><!-- doxytag: member="mrpt::math::CSparseMatrix::CholeskyDecomp::m_symbolic_structure" ref="a93f179dd287779e018e95829cf3a5c68" args="" -->
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          <td class="memname"><a class="el" href="cs_8h.html#afdd66916fadd9fd39cd279717aa5c6b9">css</a>* <a class="el" href="classmrpt_1_1math_1_1_c_sparse_matrix_1_1_cholesky_decomp.html#a93f179dd287779e018e95829cf3a5c68">mrpt::math::CSparseMatrix::CholeskyDecomp::m_symbolic_structure</a><code> [private]</code></td>
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<p>Definition at line <a class="el" href="_c_sparse_matrix_8h_source.html#l00345">345</a> of file <a class="el" href="_c_sparse_matrix_8h_source.html">CSparseMatrix.h</a>.</p>

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