Stefan Pohl wrote:
Hi!
I want to convert S-Plus 6.2 code to R 2.1.0. Instead of the function nlminb I
use the function optmin
optmin(start,fn,gr,method="L-BFGS-B", lower, upper, hess,...)
But then I get the Error in optmin ...: L-BFGS-B needs finite values of fn
Then I used optmin(start,fn,gr,method="BFGS", hess, ...)
But then I get the Error in optmin ...: initial value in vmmin is not finite
I know the final parameter estimates from S-Plus which I use as starting values
in R.
The upper and lower bounds are close around the final estimates.
So there is not much to maximize.
What can I do?
Thank you for help,
Peter
What is "optmin"? Do you mean "optim"?
Either way, you can always try your function at the initial values
outside of optim. If it returns Inf, you have a problem with your
objective function. Have you considered that your objective function in
S-PLUS didn't port the way you expected to R? I.e. if you call your
objective function in S-PLUS and then in R, using the same inputs, do
you get identical outputs?
--sundar
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