| canonicalSVD | singular value decomposition |
| hittingpoint | hitting point calculator on a given path |
| normc | default normalization function for matrix |
| sk.create | generate split knockoff copies |
| sk.decompose | make SVD as well as orthogonal complements |
| sk.filter | Split Knockoff filter for structural sparsity |
| sk.select | Split Knockoff selector given W statistics |
| W_sign | W statistics generator for directional FDR control |
| W_support | W statistics generator for FDR control |