LearnPCA-package        Functions, Data Sets and Vignettes to Aid in
                        Learning Principal Components Analysis (PCA)
PCAtoXhat               Use PCA Results to Reconstruct All or Part of
                        the Original Data Set
PCsearch                Demonstrate the Search for New Principal
                        Component Axes
XtoPCAtoXhat            Reduce a Matrix X via PCA and Reconstruct All
                        or Part to Give Xhat
