Dense2dFPCA             Two-Dimensional Functional Principal Component
                        Analysis for dense repeated functional data.
DenseMarginalFPCA       Marginal Functional Principal Component
                        Analysis for dense repeated functional data.
DenseProductFPCA        Product Functional Principal Component Analysis
                        for dense repeated functional data.
SparseMarginalFPCA      Marginal Functional Principal Component
                        Analysis for repeated sparse functional data.
SparseProductFPCA       Product Functional Principal Component Analysis
                        for sparse repeated functional data.
fdarep                  fdarep: Two-Dimensional FPCA, Marginal FPCA,
                        and Product FPCA for Repeated Functional Data
