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vonbertalanffy
2006 May 24
1
problem-nlme
...t to fit to the data different growth functions,
wich were entered by me.
Unfortunately for no it was arrived at the
convergence, several error messages appeared.
I am going to display the growth functions so as they
were entered and a "nlme" call example:
# differents growth function
#vonBertlalanffy
vonBert<- function(x, Linf, K, t0)
Linf*(1-exp(-K*(x-t0)))
size ~ vonBert(age, Linf, K,t0)
vonBert <-deriv(~ Linf*(1-exp(-K*(x-t0))),
c("Linf","K","t0"),function(x,Linf,K,t0){})
vonBertInit <- function(mCall, LHS, data)
{
xy <- sortedXyData(mCa...