R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'nipals'

nipals::empca_notes |  | EMPCA notes | HTML | source | R code
nipals::nipals_algorithm |  | NIPALS algorithm | HTML | source | R code
nipals::nipals_comparisons |  | Comparing results and performance of NIPALS functions in R | HTML | source | R code
nipals::nipals_optimization |  | NIPALS optimization notes | HTML | source | R code