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2010 Feb 04
1
Minimizing two non-linear functions with genoud - Trying to minimize or converge near zero
Hello R users,
I am trying to minimize two functions with genoud. It is actually one function with two sets of data, each of them having two unknown variables (called Vcmax and gi) which have the same value in each of the function. They are called f.1 and f.2 in the code below.
My objective to minimize the functions in order to get the two variables equal in each of the functions. Furthermore, I have a measured comparison value for each of the function expression, an...
2011 Sep 19
0
nls picewise FvCB model
Greetings R users, maybe there is someone who can help me with this problem:
I'm trying to fit this discontinous model :
GE<-data.frame( Ci<-c(81,87,91,111,159,173,295,453,629,984),
A<-c(-0.9,1.2,3.5,8.3,13.1,14.4,22.9,27.3,29.6,32.6) )
rhs <- function(Ci, Vcmax, J, Rd) {
? ?R <-0.008314472
? ?Tleaf <-25
? ?Kc <-exp(38.05-79.43/(R*(Tleaf+273.15)))
? ?Ko <-exp(20.30-36.38/(R*(Tleaf+273.15)))
? ?Gstar <-exp(19.02-38.83/(R*(Tleaf+273.15)))
? ?O <-210
? ?ge<-min( ?(Vcmax*(Ci-Gstar))/(Ci+(Kc*(1+(O/Ko))))
,(J*(Ci-Gstar))/((4*Ci)+(8*Gstar)) ?...