Calculate spectral values at a different set of wavelengths
Interpolate/re-express spectral irradiance (or other spectral quantity) values at new wavelengths values. This is a low-level function operating on numeric vectors and called by higher level functions in the package, such as mathematical operators for classes for spectral data.
interpolate_spectrum(w.length.in, s.irrad, w.length.out, fill = NA, ...)
w.length.in |
numeric vector of wavelengths (nm). |
s.irrad |
a numeric vector of spectral values. |
w.length.out |
numeric vector of wavelengths (nm). |
fill |
a value to be assigned to out of range wavelengths. |
... |
additional arguments passed to |
a numeric vector of interpolated spectral values.
The current version of interpolate uses spline if fewer than 25
data points are available. Otherwise it uses approx. In the first case
a cubic spline is used, in the second case linear interpolation, which should
be faster.
Other low-level functions operating on numeric vectors.:
as_energy(),
as_quantum_mol(),
calc_multipliers(),
div_spectra(),
energy_irradiance(),
energy_ratio(),
insert_hinges(),
integrate_xy(),
irradiance(),
l_insert_hinges(),
oper_spectra(),
photon_irradiance(),
photon_ratio(),
photons_energy_ratio(),
prod_spectra(),
s_e_irrad2rgb(),
split_energy_irradiance(),
split_photon_irradiance(),
subt_spectra(),
sum_spectra(),
trim_tails(),
v_insert_hinges(),
v_replace_hinges()
my.w.length <- 300:700 with(sun.data, interpolate_spectrum(w.length, s.e.irrad, my.w.length))
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