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authorJohannes Ranke <jranke@uni-bremen.de>2020-05-07 08:59:29 +0200
committerJohannes Ranke <jranke@uni-bremen.de>2020-05-07 08:59:29 +0200
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-#' Double First-Order in Parallel kinetics
-#'
-#' Function describing decline from a defined starting value using the sum of
-#' two exponential decline functions.
-#'
-#' @param t Time.
-#' @param parent.0 Starting value for the response variable at time zero.
-#' @param k1 First kinetic constant.
-#' @param k2 Second kinetic constant.
-#' @param g Fraction of the starting value declining according to the first
-#' kinetic constant.
-#' @return The value of the response variable at time \code{t}.
-#' @references FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence
-#' and Degradation Kinetics from Environmental Fate Studies on Pesticides in
-#' EU Registration} Report of the FOCUS Work Group on Degradation Kinetics,
-#' EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
-#' \url{http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics}
-#' @examples
-#'
-#' plot(function(x) DFOP.solution(x, 100, 5, 0.5, 0.3), 0, 4, ylim = c(0,100))
-#'
-#' @export
-DFOP.solution <- function(t, parent.0, k1, k2, g)
-{
- parent = g * parent.0 * exp(-k1 * t) +
- (1 - g) * parent.0 * exp(-k2 * t)
-}

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