Evaluate function on wavelengths of hyperSpec object

This is useful for generating certain types of baseline "reference spectra".

wl_eval(x, ..., normalize.wl = I)

# S3 method for hyperSpec
wl_eval(x, ..., normalize.wl = I)

# S3 method for numeric
wl_eval(x, ..., normalize.wl = I)

Arguments

x

either hyperSpec object or numeric vector.

...

expressions to be evaluated.

normalize.wl

function to transform the wavelengths before evaluating the polynomial (or other function). Use normalize_01() to map the wavelength range to the interval [0, 1].

Value

hyperSpec object containing one spectrum for each expression.

See also

• vanderMonde() for polynomials,

• normalize_01() to normalize the wavenumbers before evaluating the function.

Author

C. Beleites, V. Gegzna

Examples

plot(wl_eval(laser, exp = function(x) exp(-x)))


plot(wl_eval(1000:4000, y = function(x) 1 / log(x)))


plot(wl_eval(300:550, y2 = function(x) x * 2, y3 = function(x) x * 3))