R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'psd'

psd::fftw |  | DFT benchmarks: fft vs FFT | PDF | source | R code
psd::multivariate |  | Multivariate PSD | PDF | source | R code
psd::normalization |  | Normalization of power spectral density estimates | PDF | source | R code
psd::psd_overview |  | An overview of psd | PDF | source | R code

## Other files in the doc directory

| REFS.bib |