gapremove — corects from sharp baseline shifts, typically observed when lamps are switched
msc — performs a MSC-multiplicative scatter correction on a set of spectra
normc — sets to 1 the norms of the columns; columns of 0 are unchanged
pds_apply — application of a PDS model to a new dataset obtained with a spectrometer B
pds_calc — calculation of PDS-piecewise direct standardization, a method which uses the spectra acquired with a spectrometer B (master) to estimate the spectra that would have been obtained with a spectrometer A (slave)
savgol — smoothing, first or second derivate of spectra according to Savitzsky-Golay
simufilters — conversion of a wavelength unit into another wavelength unit, often shifted, according to the equation: x_new = x_old * filter'; very useful to convert frequencies into wavelengths, and vice-versa