visualizeData
PURPOSE 
Project high dim. data unto principal components (PCA) for visualization.
SYNOPSIS 
function visualizeData( X, k, IDX, types, C )
DESCRIPTION 
CROSS-REFERENCE INFORMATION 
This function calls:
- pca Principal components analysis (alternative to princomp).
- pcaApply Companion function to pca.
This function is called by:
- demoClassify DEMOCLASSIFY A demo used to test and demonstrate the usage of classifiers (clf*)
- demoCluster Clustering demo.
- nfoldxval Runs n-fold cross validation on data with a given classifier.
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