vonb.r
In PBSadmb: ADMB for R Using Scripts or GUI

# Sample R code for "PBSadmb" with the example "vonb.tpl"

# Before sourcing this file, have a valid file pathfile 
# in the current working directory (default = "ADpaths.txt", 
# but user can specify any file name in setupAD() ).

# Load R packages; ignore the GUI for now.
require(PBSmodelling); require(PBSadmb)
setupAD()

# Make and run "vonb.exe"
makeAD("vonb"); runAD("vonb");

# Read and unpack the report;
# i.e., create R variables with the same names used in "vonb.tpl"
vonb <- readList("vonb.rep"); unpackList(vonb);

# Plot the data
plot(age,y,pch=20,cex=2,col="blue",xlab="Age",ylab="Length (mm)");
lines(age,ypred,col="red",lwd=3);

# Check the calculations in R
ypredR <- Linf*(1-exp(-K*(age-t0)));
nobs   <- length(age);
fvalR  <- nobs*log(sigma) + sum((ypredR-y)^2)/(2.0*sigma^2)

cat("Functions values (ADMB & R):\n");
cat(fval,"   ",fvalR,"\n")

cat("Predictions (ADMB & R):\n");
cat(ypred,"\n");
cat(ypredR,"\n");