Function vanderMonde() generates Vandermonde matrices, the hyperSpec
method generates a hyperSpec object containing the Vandermonde matrix
of the wavelengths of a hyperSpec object.
vanderMonde(x, order, ...)
# S4 method for hyperSpec
vanderMonde(x, order, ..., normalize.wl = normalize_01)Arguments
- x
object to evaluate the polynomial on
- order
of the polynomial
- ...
hyperSpec method: further arguments to
decomposition()- normalize.wl
function to transform the wavelengths before evaluating the polynomial (or other function).
normalize_01()maps the wavelength range to the interval [0, 1]. Usebase::I()to turn off.
Value
Vandermonde matrix
hyperSpec method: hyperSpec object containing Vandermonde matrix
as spectra and an additional column $.vdm.order giving the order
of each spectrum (term).
Details
It is often numerically preferable to map wl(x) to [0, 1], see the
example.
See also
wl_eval() for calculating arbitrary functions of the wavelength
