Hello!
I am getting the following errors when running optim() [I tried optim() with
3 different methods as you can see]:
Error in optim(c(0.66, 0.999, 0.064), pe, NULL, method = "L-BFGS-B") :
objective function in optim evaluates to length 6 not 1
> out <- optim( c(0.66, 0.999, 0.064), pe, NULL, method = "Nelder-Mead")
Error in optim(c(0.66, 0.999, 0.064), pe, NULL, method = "Nelder-Mead") :
objective function in optim evaluates to length 6 not 1
> out <- optim( c(0.66, 0.999, 0.064), pe, NULL, method = "CG")
Error in optim(c(0.66, 0.999, 0.064), pe, NULL, method = "CG") :
objective function in optim evaluates to length 6 not 1
I don't know what the error message should mean to me.
Particulars for the problem are listed below.
Thanks in advance for any help!!
Stu
> y <-
c(0.111111111111111,0.0921052631578947,0.0564516129032258,0.0608108108108108
,0.0128205128205128,0.0136078431372549)
> x3 <- c(3600,169200,185400,255600,271800,342000)
> x2 <- c(1,3,4,5,6,7)
> x1 <-
c(0,0.978723404255319,0.087378640776699,0.549295774647887,0.0596026490066225
,0.61578947368421)
> observs <- data.frame(y, x1, x2, x3)
> attach(observs)
> pe <- function(c) c[1]*x1*x2^c[2]*x3^c[3]
> out <- optim(c(0.66, 0.999, 0.064), pe, NULL, method = "L-BFGS-B")
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