photon_ratio {photobiology}

Photo:photon ratio

Description

This function gives the photon ratio between two given wavebands of a radiation spectrum.

Usage

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)
)

Arguments

w.length

numeric vector of wavelength (nm).

s.irrad

numeric vector of spectral irradiances in [W\,m^{-2}\,nm^{-1}] or [mol\,s^{-1}\,sm^{-2}\,nm^{-1}] as indicated by the argument pased to unit.in.

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.

Value

a single numeric value giving the unitless ratio.

Note

The default for both w.band parameters is a waveband covering the whole range of w.length.

See Also

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(), v_replace_hinges()

Examples

with(sun.data,
     photon_ratio(w.length, s.e.irrad, new_waveband(400,500), new_waveband(400,700)))