81 lines
4.3 KiB
HTML
81 lines
4.3 KiB
HTML
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<title>Description of qzdiv</title>
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<meta name="keywords" content="qzdiv">
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<meta name="description" content="from Chris Sims web site">
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<a name="_top"></a>
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<div><a href="../index.html">Home</a> > <a href="index.html">.</a> > qzdiv.m</div>
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<!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png"> Master index</a></td>
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<td align="right"><a href="index.html">Index for . <img alt=">" border="0" src="../right.png"></a></td></tr></table>-->
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<h1>qzdiv
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</h1>
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<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
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<div class="box"><strong>from Chris Sims web site</strong></div>
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<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
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<div class="box"><strong>function [A,B,Q,Z] = qzdiv(stake,A,B,Q,Z) </strong></div>
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<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
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<div class="fragment"><pre class="comment"> from Chris Sims web site
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http://eco-072399b.princeton.edu/yftp/gensys/mfiles/QZDIV.M</pre></div>
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<!-- crossreference -->
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<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
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This function calls:
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<ul style="list-style-image:url(../matlabicon.gif)">
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<li><a href="qzswitch.html" class="code" title="function [A,B,Q,Z] = qzswitch(i,A,B,Q,Z)">qzswitch</a> from Chris Sims web site</li></ul>
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This function is called by:
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<ul style="list-style-image:url(../matlabicon.gif)">
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<li><a href="dr1.html" class="code" title="function [dr,info]=dr1(dr,task)">dr1</a> Copyright (C) 2001 Michel Juillard</li><li><a href="dr11.html" class="code" title="function dr=dr11(iorder,dr,cheik)">dr11</a> Copyright (C) 2001 Michel Juillard</li></ul>
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<!-- crossreference -->
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<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
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<div class="fragment"><pre>0001 <span class="comment">% from Chris Sims web site</span>
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0002 <span class="comment">% http://eco-072399b.princeton.edu/yftp/gensys/mfiles/QZDIV.M</span>
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0003 <span class="comment">%</span>
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0004
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0005 <a name="_sub0" href="#_subfunctions" class="code">function [A,B,Q,Z] = qzdiv(stake,A,B,Q,Z)</a>
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0006 <span class="comment">%function [A,B,Q,Z] = qzdiv(stake,A,B,Q,Z)</span>
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0007 <span class="comment">%</span>
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0008 <span class="comment">% Takes U.T. matrices A, B, orthonormal matrices Q,Z, rearranges them</span>
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0009 <span class="comment">% so that all cases of abs(B(i,i)/A(i,i))>stake are in lower right</span>
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0010 <span class="comment">% corner, while preserving U.T. and orthonormal properties and Q'AZ' and</span>
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0011 <span class="comment">% Q'BZ'.</span>
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0012 <span class="comment">%</span>
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0013 [n jnk] = size(A);
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0014 root = abs([diag(A) diag(B)]);
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0015 root(:,1) = root(:,1)-(root(:,1)<1.e-13).*(root(:,1)+root(:,2));
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0016 root(:,2) = root(:,2)./root(:,1);
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0017 <span class="keyword">for</span> i = n:-1:1
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0018 m=0;
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0019 <span class="keyword">for</span> j=i:-1:1
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0020 <span class="keyword">if</span> (root(j,2) > stake | root(j,2) < -.1)
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0021 m=j;
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0022 <span class="keyword">break</span>
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0023 <span class="keyword">end</span>
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0024 <span class="keyword">end</span>
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0025 <span class="keyword">if</span> (m==0)
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0026 <span class="keyword">return</span>
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0027 <span class="keyword">end</span>
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0028 <span class="keyword">for</span> k=m:1:i-1
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0029 [A B Q Z] = <a href="qzswitch.html" class="code" title="function [A,B,Q,Z] = qzswitch(i,A,B,Q,Z)">qzswitch</a>(k,A,B,Q,Z);
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0030 tmp = root(k,2);
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0031 root(k,2) = root(k+1,2);
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0032 root(k+1,2) = tmp;
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0033 <span class="keyword">end</span>
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0034 <span class="keyword">end</span></pre></div>
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<hr><address>Generated on Fri 16-Jun-2006 09:09:06 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> © 2003</address>
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