Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!
Get Started for Free

scale

Center and scale hyperSpec object

Description

link[base]{scale}s the spectra matrix. scale (x, scale = FALSE) centers the data.

Usage

## S4 method for signature 'hyperSpec'
scale(x, center = TRUE, scale = TRUE)

Arguments

x

the hyperSpec object
center

if TRUE, the data is centered to colMeans (x), FALSE suppresses centering. Alternatively, an object that can be converted to numeric of length nwl (x) by as.matrix (e.g. hyperSpec object containing 1 spectrum) can specify the center spectrum.
scale

if TRUE, the data is scaled to have unit variance at each wavelength, FALSE suppresses scaling. Alternatively, an object that can be converted to numeric of length nwl (x) by as.matrix (e.g. hyperSpec object containing 1 spectrum) can specify the center spectrum.

Details

Package scale provides a fast alternative for base::scale

Value

the centered & scaled hyperSpec object

Author(s)

C. Beleites

See Also

package scale.

Examples

## mean center & variance scale
tmp <- scale (chondro)
plot (tmp, "spcmeansd")
plot (sample (tmp, 5), add = TRUE, col = 2)

## mean center only
tmp <- scale (chondro, scale = FALSE)
plot (tmp, "spcmeansd")
plot (sample (tmp, 5), add = TRUE, col = 2)

## custom center
tmp <- sweep (chondro, 1, mean, `/`)
plot (tmp, "spcmeansd")
tmp <- scale (tmp, center = quantile (tmp, .05), scale = FALSE)
hyperSpec

Work with Hyperspectral Data, i.e. Spectra + Meta Information (Spatial, Time, Concentration, ...)

v0.100.0
GPL (>= 3)
Authors
Claudia Beleites [aut, cre, dtc] (<https://orcid.org/0000-0003-1626-154X>), Valter Sergo [aut], Alois Bonifacio [ctb, dtc], Marcel Dahms [ctb], Björn Egert [ctb], Simon Fuller [ctb], Vilmantas Gegzna [ctb], Rustam Guliev [ctb], Bryan A. Hanson [ctb], Michael Hermes [ctb], Martin Kammer [dtc], Roman Kiselev [ctb], Sebastian Mellor [ctb]
Initial release
2021-09-13

We don't support your browser anymore

Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.