R_FR: Calculate R:FR photon ratio from spectral irradiance.

In photobiologyPlants: Plant Photobiology Related Functions and Data

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)

photobiologyPlants documentation built on April 3, 2025, 10:44 p.m.