photobiologyPlants (version 0.5.0)

Pfr_P_ratio: Calculation of Pfr:Ptot ratio from spectral irradiance

Description

Ratio between Pr and Ptot (photoequilibrium) for Type I Phytochrome.

Usage

Pfr_P_ratio(
  w.length,
  s.irrad = rep(1, length(w.length)),
  unit.in = "energy",
  check.spectrum = TRUE,
  use.cached.mult = FALSE
)

Value

a single numeric value giving the unitless photon ratio

Arguments

w.length

numeric array of wavelength (nm)

s.irrad

numeric array of spectral (energy) irradiances (W m-2 nm-1) or (mol s-1 m-2)

unit.in

character string with allowed values "energy", and "photon", or its alias "quantum"

check.spectrum

logical indicating whether to sanity check input data, default is TRUE

use.cached.mult

logical indicating whether multiplier values should be cached between calls

References

Mancinelli, A.L. (1994) The physiology of phytochrome action. In Photomorphogenesis in plants, 2nd edition. R.E. Kendrick and G.H.M. Kronenberg, eds. Kluwer Academic Publishers, Dordrecht, pp. 211-269. ISBN 978-0-7923-2551-2 (print), 978-94-011-1884-2 (on-line). tools:::Rd_expr_doi("10.1007/978-94-011-1884-2_10")