spftir (version 0.1.0)

spsga: Savitzky-Golay Smoothing Filter of a Mid-infrared Spectrum

Description

This function allows applying a Savitzky-Golay smoothing filter to the mid-infrared spectrum (N spectra= 1).

Usage

spsga(spectrum, p = 2, sw = 21)

Arguments

spectrum

matrix. The matrix of FTIR spectra. The first row corresponds to wavenumber; the second row corresponds to absorbances.

p

numeric. Filter order. Defaults to 2.

sw

numeric. Filter length (must be odd). Defaults to 21.

Value

A smoothed spectrum matrix by means of a Savitzky-Golay smoothing filter. The first row corresponds to wavenumber; the second row corresponds to absorbances.

Examples

data(spData)
# Convert data frame to matrix
spectrum <- as.matrix(t(spData[, c("Wavenumber","A")]))
# Smoothed spectrum
sga <- spsga(spectrum=spectrum, p=2, sw= 21)