ClusterEntropy          A function to measure cluster entropy
ClusterPurity           A function to measure cluster purity
ConsensusMatPlot        A function to create image plot of the
                        consensus matrix
SilhouettePlot          A function to plot silhouette width
nmf.mnnals              Nonnegative Matrix Factorization of Multiple
                        data using Nonnegative Alternating Least Square
nmf.opt.k               Selection of optimum number of clusters (k)
