| photon_ratio {photobiology} | R Documentation |
This function gives the photon ratio between two given wavebands of a radiation spectrum.
photon_ratio(w.length, s.irrad, w.band.num = NULL, w.band.denom = NULL,
unit.in = "energy", check.spectrum = TRUE, use.cached.mult = FALSE,
use.hinges = getOption("photobiology.use.hinges", default = NULL))
w.length |
numeric vector of wavelength (nm). |
s.irrad |
numeric vector of spectral (energy or photon) irradiances (W m-2 nm-1) or (mol s-1 m-2 nm-1). |
w.band.num |
waveband object used to compute the numerator of the ratio. |
w.band.denom |
waveband object used to compute the denominator of the ratio. |
unit.in |
character Allowed values "energy", and "photon", or its alias "quantum". |
check.spectrum |
logical Flag telling whether to sanity check input data, default is TRUE. |
use.cached.mult |
logical Flag telling whether multiplier values should be cached between calls. |
use.hinges |
logical Flag indicating whether to insert "hinges" into the spectral data before integration so as to reduce interpolation errors at the boundaries of the wavebands. |
a single numeric value giving the unitless ratio.
The default for both w.band parameters is a waveband covering
the whole range of w.length.
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,
interpolate_spectrum,
irradiance, l_insert_hinges,
oper_spectra,
photon_irradiance,
photons_energy_ratio,
prod_spectra, s_e_irrad2rgb,
split_energy_irradiance,
split_photon_irradiance,
subt_spectra, sum_spectra,
trim_tails, v_insert_hinges
with(sun.data,
photon_ratio(w.length, s.e.irrad, new_waveband(400,500), new_waveband(400,700)))