spvalley: Identification of Valleys of a Mid-infrared Spectra
In spftir: Pre-Processing and Analysis of Mid-Infrared Spectral Region

Description Usage Arguments Value Author(s) Examples

This function allows to identify valleys of a mid-infrared spectra.

1	spvalley(spectra, span = 3, tol = 0.2)

`spectra`	matrix. The matrix of FTIR spectra. The first row corresponds to wavenumber; the remaining rows corresponds to absorbances.
`span`	numeric. Peak detection threshold.
`tol`	numeric. Percentage of the maximum value of the spectrum (positive value).

An object of class spvalley, which is a list of matrices for each of the spectra.

Claudio Pozo Valenzuela [aut, cre] and Saddys Rodriguez-llamazares [aut]

data(spData)
# Convert data frame to matrix
spectra <- as.matrix(t(spData))
# List of valley detection
vls <- sppeak(spectra=spectra, span=3, tol=0.2)
# Valleys of the first spectrum
vls[[1]]
# Valleys of the second spectrum
vls[[2]]