Can some help me spot what I'm doing wrong here.
I have two equations, one a michalis-menton eqn and one a straight line.
I need to work out where they cross.
I created the function:
solveEqn<-function(x,vals){
Vmax<-vals[1]
Ks<-vals[2]
m<-vals[3]
c<-vals[4]
diff<-0
mmVal<-exp(Vmax+x/(Ks+x))
slVal<-x*m+c
diff<-mmVal-slVal
return(diff)
}
> optim(c(200,500),solveEqn,vals=c(2.4591201,-0.4015233,5.924e-5,3.437))
Error in optim(c(200, 500), solveEqn, vals = c(2.4591201, -0.4015233, :
objective function in optim evaluates to length 2 not 1
If i replace return(diff) with sum(diff) then the optim function runs
but returns the wrong value (which should be about 290).
Many thanks
Tom
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
