R_FR: Calculate R:FR photon ratio from spectral irradiance.
Description
This function returns the red:far-red photon ratio of a light source
spectrum.
Usage
R_FR(spct, std = "Smith10", use.cached.mult = FALSE, use.hinges = TRUE)
Arguments
spct
an object of class "source.spct"
std
select which definition of red and far-red should be used,
defaults to "Smith"
use.cached.mult
logical indicating whether multiplier values should be
cached between calls
use.hinges
logical indicating whether to use hinges to reduce
interpolation errors
Value
a single numeric nondimensional value giving the R:FR photon ratio,
with name attribute set to the name of the wavebands, with "(q:q)"
appended.
Examples
Run this code# NOT RUN {
R_FR(sun.spct)
# }
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