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<title>QuantLib: TqrEigenDecomposition Class Reference</title>
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<b>QuantLib</b>::<a class="el" href="class_quant_lib_1_1_tqr_eigen_decomposition.html">TqrEigenDecomposition</a></div>
<h1>TqrEigenDecomposition Class Reference</h1><!-- doxytag: class="QuantLib::TqrEigenDecomposition" --><code>#include <ql/Math/tqreigendecomposition.hpp></code>
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<a href="class_quant_lib_1_1_tqr_eigen_decomposition-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
tridiag. QR eigen decomposition with explicite shift aka Wilkinson
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References:<p>
Wilkinson, J.H. and Reinsch, C. 1971, <a class="el" href="class_quant_lib_1_1_linear.html">Linear</a> Algebra, vol. II of Handbook for Automatic Computation (New York: Springer-Verlag)<p>
"Numerical Recipes in C", 2nd edition, Press, Teukolsky, Vetterling, Flannery,<p>
<dl compact><dt><b><a class="el" href="test.html#_test000053">Tests:</a></b></dt><dd>the correctness of the result is tested by checking it against known good values. </dd></dl>
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><b>EigenVectorCalculation</b> { <b>WithEigenVector</b>,
<b>WithoutEigenVector</b>,
<b>OnlyFirstRowEigenVector</b>
}</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><b>ShiftStrategy</b> { <b>NoShift</b>,
<b>Overrelaxation</b>,
<b>CloseEigenValue</b>
}</td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6794a0e945332a99dc6f7a831bdffdf9"></a><!-- doxytag: member="QuantLib::TqrEigenDecomposition::TqrEigenDecomposition" ref="6794a0e945332a99dc6f7a831bdffdf9" args="(const Array &diag, const Array &sub, EigenVectorCalculation calc=WithEigenVector, ShiftStrategy strategy=CloseEigenValue)" -->
</td><td class="memItemRight" valign="bottom"><b>TqrEigenDecomposition</b> (const <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &diag, const <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &sub, EigenVectorCalculation calc=WithEigenVector, ShiftStrategy strategy=CloseEigenValue)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5a59f34407b17515e8082bf187271148"></a><!-- doxytag: member="QuantLib::TqrEigenDecomposition::eigenvalues" ref="5a59f34407b17515e8082bf187271148" args="() const" -->
const <a class="el" href="class_quant_lib_1_1_array.html">Array</a> & </td><td class="memItemRight" valign="bottom"><b>eigenvalues</b> () const</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="19a7dbcd8a79286ea89be1861a1d78b9"></a><!-- doxytag: member="QuantLib::TqrEigenDecomposition::eigenvectors" ref="19a7dbcd8a79286ea89be1861a1d78b9" args="() const" -->
const <a class="el" href="class_quant_lib_1_1_matrix.html">Matrix</a> & </td><td class="memItemRight" valign="bottom"><b>eigenvectors</b> () const</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="d867703aff31360186a23f87b35b6686"></a><!-- doxytag: member="QuantLib::TqrEigenDecomposition::iterations" ref="d867703aff31360186a23f87b35b6686" args="() const" -->
Size </td><td class="memItemRight" valign="bottom"><b>iterations</b> () const</td></tr>
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