spectacles (version 0.5-4)

SpectraDataFrame: Constructor for the SpectraDataFrame class.

Description

Constructor for the SpectraDataFrame class. Creates a SpectraDataFrame object, either from scratch, or from an existing Spectra object.

Usage

SpectraDataFrame(
  ...,
  wl = numeric(),
  nir = matrix(),
  id = as.character(NA),
  units = "nm",
  data = data.frame()
)

Value

a new "SpectraDataFrame" object

Arguments

...

an object inheriting from "Spectra"

wl

a numeric vector giving the wavelengths at with the spectra have been measured

nir

a "matrix" or a "data.frame" object giving the spectra values for each sample

id

a vector giving the unique id of each sample in the collection

units

a character giving the unit in which the wavelengths values are expressed

data

object of class "data.frame" containing the attribute data

Author

Pierre Roudier

See Also

spectra, wl, Spectra-class

Examples

  # Creating a SpectraDataFrame object from scratch
  my.wl <- 350:2500
  my.id <- c("A", "B")
  my.nir <- matrix(runif(2*length(my.wl)), nrow=2)
  my.data <- data.frame(foo = runif(2), bar = LETTERS[1:2])
  my.sdf <- SpectraDataFrame(wl = my.wl, nir = my.nir, id = my.id, data = my.data)

  # Creating a SpectraDataFrame object from an existing Spectra object
  my.s <- Spectra(wl = my.wl, nir = my.nir, id = my.id)
  my.sdf <- SpectraDataFrame(my.s, data = my.data)