hyperSpec: vanderMonde – R documentation

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

vanderMonde

Function evaluation on hyperSpec objects

Description

vandermonde generates van der Monde matrices, the hyperSpec method generates a hyperSpec object containing the van der Monde matrix of the wavelengths of a hyperSpec object.

Usage

vanderMonde(x, order, ...)

## S4 method for signature 'hyperSpec'
vanderMonde(x, order, ..., normalize.wl = normalize01)

Arguments

`x`	object to evaluate the polynomial on
`order`	of the polynomial
`...`	hyperSpec method: further arguments to `decomposition`
`normalize.wl`	function to transorm the wavelengths before evaluating the polynomial (or other function). `normalize01` maps the wavelength range to the interval [0, 1]. Use `I` to turn off.

Details

It is often numerically preferrable to map wl (x) to [0, 1], see the example.

Value

van der Monde matrix

hyperSpec method: hyperSpec object containing van der Monde matrix as spectra and an additional column ".vdm.order" giving the order of each spectrum (term).

Author(s)

C. Beleites

Examples

plot (vanderMonde (flu, 2))
plot (vanderMonde (flu, 2, normalize.wl = I))

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