pca_visualize
PURPOSE 
Visualization of quality of approximation of X given principle components.
SYNOPSIS 
function varargout = pca_visualize( U, mu, variances, X, index, ks, filename, show )
DESCRIPTION 
CROSS-REFERENCE INFORMATION 
This function calls:
- pca_apply Companion function to pca.
- im Function for displaying grayscale images.
- makemovies [4D] Used to convert R sets of equal length videos into a single movie.
- montage2 [3D] Used to display a stack of T images.
This function is called by:
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