ChemoSpec: sgfSpectra – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

sgfSpectra

Apply Savitzky-Golay filters to a Spectra object

Description

This function is a simple wrapper around the function sgolayfilt. It allows one to apply Savitzky-Golay filters to a Spectra object in a convenient way.

Usage

sgfSpectra(spectra, m = 0, ...)

Arguments

`spectra`	An object of S3 class `Spectra` to be checked.
`m`	The desired m-th derivative. `m = 0` smooths the data (i.ei a rolling average), `m = 1` gives the first derivative etc.
`...`	Other parameters to be passed to `sgolayfilt`.

Value

A object of class Spectra.

Author(s)

Bryan A. Hanson, DePauw University.

Examples

data(SrE.IR)
myt1 <- expression(bolditalic(Serenoa) ~ bolditalic(repens) ~ bold(IR ~ Spectra))
myt2 <- expression(bolditalic(Serenoa) ~ bolditalic(repens) ~ bold(IR ~ Spectra ~ (Smoothed)))

par(mfrow = c(2, 1))
plotSpectra(SrE.IR, xlim = c(1900, 2100), yrange = c(0, 0.05), main = myt1)
temp <- sgfSpectra(SrE.IR)
plotSpectra(temp, xlim = c(1900, 2100), yrange = c(0, 0.05), main = myt2)
par(mfrow = c(1, 1))

ChemoSpec

Exploratory Chemometrics for Spectroscopy

v5.3.11

GPL-3

Authors

Bryan A. Hanson [aut, cre] (<https://orcid.org/0000-0003-3536-8246>), Mike Bostock [cph, ctb] (author of the d3.js library used by plotSpectraJS, http://d3js.org), Matt Keinsley [ctb] (author of initial AOV-PCA code)

Initial release

2021-03-24