randSample
PURPOSE 
Generate values sampled uniformly without replacement from 1:n.
SYNOPSIS 
function r = randSample( n, k, isArray )
DESCRIPTION 
CROSS-REFERENCE INFORMATION 
This function calls:
This function is called by:
- kmeans2 Fast version of kmeans clustering.
- pca Principal components analysis (alternative to princomp).
- rbfComputeBasis Get locations and sizes of radial basis functions for use in rbf network.
- clusterMontage Used for visualization of clusters of images and videos.
- jitterImage Creates multiple, slightly jittered versions of an image.
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