R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'nnTensor'

nnTensor::nnTensor-1 |  | 1. Non-negative Matrix Factorization (`NMF` and `NMTF`) | HTML | source | R code
nnTensor::nnTensor-2 |  | 2. Simultaneous Non-negative Matrix Factorization (`siNMF` and `jNMF`) | HTML | source | R code
nnTensor::nnTensor-3 |  | 3. Non-negative Tensor Factorization (`NTF` and `NTD`) | HTML | source | R code
nnTensor::nnTensor-4 |  | 4. Cross-validation by mask matrix/tensor (`kFoldMaskTensor`) | HTML | source | R code

## Other files in the doc directory

| bibliography.bib