escription"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Companion function to pca.

 Use pca.m to retrieve the principal components U and the mean mu from a
 set of vectors x, then use pcaApply to get the first k coefficients of
 x in the space spanned by the columns of U. See pca for general usage.

 If x is large, pcaApply first splits and processes x in parts. This
 allows pcaApply to work even for very large arrays