ChemoSpec2D: centscaleSpectra2D – R documentation

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centscaleSpectra2D

Center and Scale a Spectra2D Object Along the Samples Dimension

Description

This function will optionally center, and optionally scale, a Spectra2D object along the samples dimension (i.e. this is pixel-wise scaling in the language of multivariate image analysis). Several scaling options are available.

Usage

centscaleSpectra2D(spectra, center = FALSE, scale = "noscale")

Arguments

`spectra`	An object of S3 class `Spectra2D`.
`center`	Logical. Should the spectra be centered before possibly scaling? Will give an error if `center = TRUE` and a log function is requested for scaling.
`scale`	A character string indicating the type of scaling to apply. One of `c("autoscale", "Pareto", "log", "log10")`. For the log functions, centering is not carried out since logarithm is not defined for negative values.

Value

An object of S3 class Spectra2D.

Author(s)

Bryan A. Hanson, DePauw University.

References

R. Bro and A. K. Smilde "Centering and Scaling in Component Analysis" J. Chemometrics vol. 17 pgs 16-33 (2003).

Examples

data(MUD1)
tst <- centscaleSpectra2D(MUD1)

ChemoSpec2D

Exploratory Chemometrics for 2D Spectroscopy

v0.4.187

GPL-3

Authors

Bryan A. Hanson [aut, cre] (<https://orcid.org/0000-0003-3536-8246>)

Initial release

2021-03-15