aboutsummaryrefslogtreecommitdiff
path: root/R/endpoints.R
diff options
context:
space:
mode:
Diffstat (limited to 'R/endpoints.R')
-rw-r--r--R/endpoints.R39
1 files changed, 31 insertions, 8 deletions
diff --git a/R/endpoints.R b/R/endpoints.R
index f7ee483a..586ef9ff 100644
--- a/R/endpoints.R
+++ b/R/endpoints.R
@@ -7,9 +7,13 @@
#' are equivalent to the rate constantes of the DFOP model, but with the
#' advantage that the SFORB model can also be used for metabolites.
#'
-#' @param fit An object of class \code{\link{mkinfit}}.
+#' @param fit An object of class \code{\link{mkinfit}} or
+#' \code{\link{nlme.mmkin}}
#' @importFrom stats optimize
-#' @return A list with the components mentioned above.
+#' @return A list with a matrix of dissipation times named distimes,
+#' and, if applicable, a vector of formation fractions named ff
+#' and, if the SFORB model was in use, a vector of eigenvalues
+#' of these SFORB models, equivalent to DFOP rate constants
#' @note The function is used internally by \code{\link{summary.mkinfit}}.
#' @author Johannes Ranke
#' @keywords manip
@@ -17,6 +21,10 @@
#'
#' fit <- mkinfit("FOMC", FOCUS_2006_C, quiet = TRUE)
#' endpoints(fit)
+#' \dontrun{
+#' fit_2 <- mkinfit("SFORB", FOCUS_2006_C, quiet = TRUE)
+#' endpoints(fit_2)
+#' }
#'
#' @export
endpoints <- function(fit) {
@@ -25,8 +33,22 @@ endpoints <- function(fit) {
# Additional DT50 values are calculated from the FOMC DT90 and k1 and k2 from
# HS and DFOP, as well as from Eigenvalues b1 and b2 of any SFORB models
ep <- list()
- obs_vars <- fit$obs_vars
- parms.all <- c(fit$bparms.optim, fit$bparms.fixed)
+ if (inherits(fit, "mkinfit")) {
+ mkinmod <- fit$mkinmod
+ parms.all <- c(fit$bparms.optim, fit$bparms.fixed)
+ } else {
+ if (inherits(fit, "nlme.mmkin")) {
+ mkinmod <- fit$mmkin_orig[[1]]$mkinmod
+ bparms.optim <- backtransform_odeparms(fit$coefficients$fixed,
+ mkinmod,
+ transform_rates = fit$mmkin_orig[[1]]$transform_rates,
+ transform_fractions = fit$mmkin_orig[[1]]$transform_fractions)
+ parms.all <- c(bparms.optim, fit$bparms.fixed)
+ } else {
+ stop("Only implemented for mkinfit and nlme.mmkin objects")
+ }
+ }
+ obs_vars <- names(mkinmod$spec)
ep$ff <- vector()
ep$SFORB <- vector()
ep$distimes <- data.frame(
@@ -34,7 +56,7 @@ endpoints <- function(fit) {
DT90 = rep(NA, length(obs_vars)),
row.names = obs_vars)
for (obs_var in obs_vars) {
- type = names(fit$mkinmod$map[[obs_var]])[1]
+ type = names(mkinmod$map[[obs_var]])[1]
# Get formation fractions if directly fitted, and calculate remaining fraction to sink
f_names = grep(paste("^f", obs_var, sep = "_"), names(parms.all), value=TRUE)
@@ -56,7 +78,7 @@ endpoints <- function(fit) {
k_tot = sum(parms.all[k_names])
DT50 = log(2)/k_tot
DT90 = log(10)/k_tot
- if (fit$mkinmod$use_of_ff == "min") {
+ if (mkinmod$use_of_ff == "min" && length(obs_vars) > 1) {
for (k_name in k_names)
{
ep$ff[[sub("k_", "", k_name)]] = parms.all[[k_name]] / k_tot
@@ -78,7 +100,7 @@ endpoints <- function(fit) {
n = parms.all[paste("N", obs_var, sep = "_")]
k = k_tot
# Use the initial concentration of the parent compound
- source_name = fit$mkinmod$map[[1]][[1]]
+ source_name = mkinmod$map[[1]][[1]]
c0 = parms.all[paste(source_name, "0", sep = "_")]
alpha = 1 / (n - 1)
beta = (c0^(1 - n))/(k * (n - 1))
@@ -86,7 +108,7 @@ endpoints <- function(fit) {
DT90 = beta * (10^(1/alpha) - 1)
DT50_back = DT90 / (log(10)/log(2)) # Backcalculated DT50 as recommended in FOCUS 2011
ep$distimes[obs_var, c("DT50back")] = DT50_back
- if (fit$mkinmod$use_of_ff == "min") {
+ if (mkinmod$use_of_ff == "min") {
for (k_name in k_names)
{
ep$ff[[sub("k_", "", k_name)]] = parms.all[[k_name]] / k_tot
@@ -196,6 +218,7 @@ endpoints <- function(fit) {
}
ep$distimes[obs_var, c("DT50", "DT90")] = c(DT50, DT90)
}
+ if (length(ep$ff) == 0) ep$ff <- NULL
if (length(ep$SFORB) == 0) ep$SFORB <- NULL
return(ep)
}

Contact - Imprint