WriteMatrixToFile       Function to write a data matrix to a text file.
avg_probe_exp           Function to produce a matrix containing the
                        average expression of each gene probe within
                        each sample cluster.
cluster_analysis        Function to perform Kmeans or Hierarchical
                        clustering analysis of the selected gene probe
                        expression data.
input_file              Function to read-in the gene expression file
                        and assign gene probe names as the rownames.
nor.min.max             Function to normalize data to bring values into
                        alignment. This function uses feature scaling
                        to normalize values in a dataset between 0 and
                        1.
number_clusters         Function to determine the number of clusters to
                        be used to cluster gene probes and samples.
number_probes           Function to determine the number of gene probes
                        to select for in the gene feature selection
                        process.
probe_ranking           Function to select for genes using one of the
                        available gene probe ranking options.
surv_analysis           Function to produce Kaplan-Meier Survival Plots
                        of selected gene expression data.
