R/f4.R

In aj-sykes92/soilc.ipcc: The IPCC (2019) Tier 2 Steady-State Method for Soil Carbon

#' @title Calculate the \code{f4} parameter
#' @description Calculates \code{f4} model parameter, which is variable depending on soil sand
#' fraction.
#' @param sand_frac A numeric scalar or vector indicating the sand proportion in the soil mineral
#' makeup, fractional.
#' @param params A named list containing model parameters. Defaults to the package default parameter
#' set \code{soilc_params}.
f4 <- function(sand_frac, params = soilc_params) {
  1 - params$f5$be - (params$f4par1$be + params$f4par2$be * sand_frac)
}