On May 29, 2008, at 11:54 PM, Redding, Matthew wrote:
Dear R Gurus,
I am having a little difficulty with nlm. I've searched the
archives and
found nothing that tells me why this is occuring -- though there are
some slightly similar issues.
A simple example:
lev2<-function(aaa,bbb,ccc,ddd,eee){
res<-aaa+bbb+ccc+ddd+eee
res
}
nlm(lev2,p=c(32,4,5),ddd=45,eee=23)
Error in f(x, ...) : argument "bbb" is missing, with no default
Why is this occurring? I am running 2.6.1.
Is there something simple here that I am overlooking? I am trying to
take advantage of the "..." method of inputing
parameters that I do not want optimised.
Kind regards,
Read the documentation for nlm more closely. The Arguments part says
about f:
This should be a function of a vector of the length of p followed by
any other arguments specified by the ... argument.
All the examples in fact do exactly that, using only the first
variable, x, of f for all the unknowns. So perhaps you want to do a
simple wrapping like this:
lev3 <- function(x,ddd,eee) {
lev2(x[1],x[2],x[3],ddd,eee)
}
nlm(lev3,p=c(32,4,5),ddd=45,eee=23)
Matt Redding
Haris Skiadas
Department of Mathematics and Computer Science
Hanover College
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