📄 gmmgrow.html

📁 一个关于数据聚类和模式识别的程序,在生物化学,化学中因该都可以用到.希望对大家有用,谢谢支持
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"                "http://www.w3.org/TR/REC-html40/loose.dtd"><html><head>  <title>Description of gmmGrow</title>  <meta name="keywords" content="gmmGrow">  <meta name="description" content="gmmGrow: Grow gaussians within a GMM">  <meta http-equiv="Content-Type" content="text/html; charset=big5">  <meta name="generator" content="m2html &copy; 2003 Guillaume Flandin">  <meta name="robots" content="index, follow">  <link type="text/css" rel="stylesheet" href="../m2html.css"></head><body><a name="_top"></a><div><a href="../index.html">Home</a> &gt;  <a href="index.html">dcpr</a> &gt; gmmGrow.m</div><!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png">&nbsp;Master index</a></td><td align="right"><a href="index.html">Index for dcpr&nbsp;<img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>gmmGrow</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>gmmGrow: Grow gaussians within a GMM</strong></div><h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>function gmmParam=gmmGrow(gmmParam, targetGaussianNum) </strong></div><h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre class="comment"> gmmGrow: Grow gaussians within a GMM 
    Usage: gmmParam=gmmGrow(gmmParam, targetGaussianNum)

    For example, please refer to gmmGrowDemo.m</pre></div><!-- crossreference --><h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>This function calls:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="gmmGrowDemo.html" class="code" title="">gmmGrowDemo</a>	Example of using gmmGrow.m for growing a GMM (gaussian mixture models).</li></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="gmmGrowDemo.html" class="code" title="">gmmGrowDemo</a>	Example of using gmmGrow.m for growing a GMM (gaussian mixture models).</li></ul><!-- crossreference --><h2><a name="_subfunctions"></a>SUBFUNCTIONS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><ul style="list-style-image:url(../matlabicon.gif)"><li><a href="#_sub1" class="code">function selfdemo</a></li></ul><h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function gmmParam=gmmGrow(gmmParam, targetGaussianNum)</a>0002 <span class="comment">% gmmGrow: Grow gaussians within a GMM</span>0003 <span class="comment">%    Usage: gmmParam=gmmGrow(gmmParam, targetGaussianNum)</span>0004 <span class="comment">%</span>0005 <span class="comment">%    For example, please refer to gmmGrowDemo.m</span>0006 0007 <span class="comment">%    Roger Jang, 20080727</span>0008 0009 <span class="keyword">if</span> nargin&lt;1, <a href="#_sub1" class="code" title="subfunction selfdemo">selfdemo</a>; <span class="keyword">return</span>; <span class="keyword">end</span>0010 0011 gaussianNum=length(gmmParam);0012 <span class="keyword">if</span> targetGaussianNum&gt;2*gaussianNum0013     error(<span class="string">'Growth too fast!'</span>);0014 <span class="keyword">end</span>0015 0016 dim=length(gmmParam(1).mu);0017 index=randperm(gaussianNum);0018 <span class="keyword">for</span> i=1:targetGaussianNum-gaussianNum0019     <span class="comment">% To clone a gaussian, weight is lowered first</span>0020     gmmParam(index(i)).w=gmmParam(index(i)).w/2;0021     <span class="comment">% Start clone</span>0022     gmmParam(end+1)=gmmParam(index(i));0023     <span class="comment">% Find sigma to guide the center splitting</span>0024     sigma=gmmParam(end).sigma;0025     <span class="keyword">if</span> length(sigma)==1, sigma=sigma*eye(dim); <span class="keyword">end</span>0026     <span class="keyword">if</span> prod(size(sigma))==dim*dim, sigma=diag(sigma); <span class="keyword">end</span>0027     <span class="comment">% Center splitting</span>0028     gmmParam(end).mu=gmmParam(end).mu+randn(dim, 1).*sigma;0029 <span class="keyword">end</span>0030 0031 <span class="comment">% ====== Self demo</span>0032 <a name="_sub1" href="#_subfunctions" class="code">function selfdemo</a>0033 <a href="gmmGrowDemo.html" class="code" title="">gmmGrowDemo</a>;</pre></div><hr><address>Generated on Thu 30-Oct-2008 12:53:56 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> &copy; 2003</address></body></html>
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