photobiology (version 0.9.6)

interpolate_wl: Map spectra to new wavelength values.

Description

This function returns the result of interpolating spectral data from the original set of wavelengths to a new one.

Usage

interpolate_wl(x, w.length.out, fill, length.out, ...)

## S3 method for class 'default':
interpolate_wl(x, w.length.out, fill, length.out, ...)

## S3 method for class 'generic_spct':
interpolate_wl(x, w.length.out = NULL, fill = NA,
  length.out = NULL, ...)

## S3 method for class 'generic_mspct':
interpolate_wl(x, w.length.out = NULL, fill = NA,
  length.out = NULL, ...)

Arguments

x

an R object

w.length.out

numeric array of wavelengths (nm)

fill

a value to be assigned to out of range wavelengths

length.out

numeric value

...

not used

Value

• A new spectral object of the same class as argument spct.

Methods (by class)

• default: Default for generic function
• generic_spct: Interpolate wavelength in an object of class "generic_spct" or derived.
• generic_mspct: Interpolate wavelength in an object of class "generic_mspct" or derived.

Details

If length.out it is a numeric value, then gives the number of rows in the output, if it is NULL, the values in the numeric vector w.length.out are used. If both are not NULL then the range of w.length.out and length.out are used to generate a vector of wavelength. A value of NULL for fill prevents extrapolation.

Examples

interpolate_wl(sun.spct, 400:500, NA)
interpolate_wl(sun.spct, 400:500, NULL)
interpolate_wl(sun.spct, seq(200, 1000, by=0.1), 0)
interpolate_wl(sun.spct, c(400,500), length.out=201)