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confMatrix.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title>Description of confMatrix</title>
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<meta name="description" content="Generates a confusion matrix according to true and predicted data labels.">
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<h1>confMatrix
</h1>
<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>Generates a confusion matrix according to true and predicted data labels.</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 CM = confMatrix( IDXtrue, IDXpred, ntypes ) </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"> Generates a confusion matrix according to true and predicted data labels.
CM(i,j) denotes the number of elements of class i that were given label
j. In other words, each row i contains the predictions for elements whos
actual class was i. If IDXpred is perfect, then CM is a diagonal matrix
with CM(i,i) equal to the number of instances of class i.
To normalize CM to [0,1], divide each row by sum of that row:
CMnorm = CM ./ repmat( sum(CM,2), [1 size(CM,2)] );
USAGE
CM = confMatrix( IDXtrue, IDXpred, ntypes )
INPUTS
IDXtrue - [nx1] array of true labels [int values in 1-ntypes]
IDXpred - [nx1] array of predicted labels [int values in 1-ntypes]
ntypes - maximum number of types (should be > max(IDX))
OUTPUTS
CM - ntypes x ntypes confusion array with integer values
EXAMPLE
IDXtrue = [ones(1,25) ones(1,25)*2];
IDXpred = [ones(1,10) randint2(1,30,[1 2]) ones(1,10)*2];
CM = confMatrix( IDXtrue, IDXpred, 2 )
confMatrixShow( CM, {'class-A','class-B'}, {'FontSize',20} )
See also <a href="confMatrixShow.html" class="code" title="function confMatrixShow( CM, types, pvPairs, nDigits, showCnts )">CONFMATRIXSHOW</a>
Piotr's Computer Vision Matlab Toolbox Version 2.12
Copyright 2014 Piotr Dollar. [pdollar-at-gmail.com]
Licensed under the Simplified BSD License [see external/bsd.txt]</pre></div>
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