R_FR {photobiologyPlants}

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 dimensionless value giving the R:FR photon ratio, with name attribute set to the name of the wavebands, with "(q:q)" appended.

See Also

Red, Far_red and q_ratio.

Examples

R_FR(sun.spct)