| center | Center a vector | 
| cov.x | Covariance matrix | 
| disvm | Subspace distance | 
| gen.data | Simulate data | 
| gOLS | Groupwise OLS (gOLS) | 
| gOLS.comp.d | Groupwise OLS (gOLS) BIC criterion to estimate dimensions with eigen-decomposition | 
| gSIR | Groupwise SIR (gSIR) for binary response | 
| gSIR.comp.d | Groupwise SIR (gSIR) BIC criterion to estimate dimensions with eigen-decomposition (binary response) | 
| matpower | Power of a matrix | 
| norm1 | Normalize a vector | 
| orthnormal | Gram-Schmidt orthonormalization | 
| sOLS.comp.d | Structured OLS (sOLS) outer level BIC criterion to estimate dimension with eigen-decomposition | 
| standmat | Matrix standardization |