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<html><head> <meta HTTP-EQUIV="Content-Type" CONTENT="text/html;charset=ISO-8859-1"> <title>Contents.m</title><link rel="stylesheet" type="text/css" href="../stpr.css"></head><body><table border=0 width="100%" cellpadding=0 cellspacing=0><tr valign="baseline"><td valign="baseline" class="function"><b class="function">MAHALAN</b><td valign="baseline" align="right" class="function"><a href="../probab/index.html" target="mdsdir"><img border = 0 src="../up.gif"></a></table> <p><b>Computes Mahalanobis distance.</b></p> <hr><div class='code'><code><span class=help></span><br><span class=help> <span class=help_field>Synopsis:</span></span><br><span class=help> dist = mahalan(X,Mean,Cov)</span><br><span class=help></span><br><span class=help> <span class=help_field>Description:</span></span><br><span class=help> It computes Mahalanobis distance between column vectors </span><br><span class=help> of matrix X and vector Mean with matrix Cov, i.e.,</span><br><span class=help></span><br><span class=help> dist(i) = (X(:,i)-Mean)'*inv(C)*(X(:,i)-Mean)</span><br><span class=help></span><br><span class=help> for all i=1:size(X,2).</span><br><span class=help></span><br><span class=help> <span class=help_field>Input:</span></span><br><span class=help> X [dim x num_data] Input data.</span><br><span class=help> Mean [dim x 1] Vector.</span><br><span class=help> Cov [dim x dim] Matrix.</span><br><span class=help></span><br><span class=help> <span class=help_field>Output:</span></span><br><span class=help> dist [1 x num_data] Mahalanobis distance.</span><br><span class=help></span><br><span class=help> <span class=help_field>Example:</span></span><br><span class=help> It plots isolines of Mahalanobis distance.</span><br><span class=help></span><br><span class=help> [Ax,Ay] = meshgrid(linspace(-5,5,100), linspace(-5,5,100));</span><br><span class=help> dist = mahalan([Ax(:)';Ay(:)'],[0;0],[1 0.5; 0.5 1]);</span><br><span class=help> figure; contour( Ax, Ay, reshape(dist,100,100));</span><br><span class=help></span><br></code></div> <hr> <b>Source:</b> <a href= "../probab/list/mahalan.html">mahalan.m</a> <p><b class="info_field">About: </b> Statistical Pattern Recognition Toolbox<br> (C) 1999-2003, Written by Vojtech Franc and Vaclav Hlavac<br> <a href="http://www.cvut.cz">Czech Technical University Prague</a><br> <a href="http://www.feld.cvut.cz">Faculty of Electrical Engineering</a><br> <a href="http://cmp.felk.cvut.cz">Center for Machine Perception</a><br> <p><b class="info_field">Modifications: </b> <br> 28-apr-2004, VF<br></body></html>?? 快捷鍵說明
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