R help - Jun 2009 - paramter restriction in optim

Hi,

I would like to know if you could help me... I need to restrict a parameter
in a problem of optimization but I don't know how to do it.

function(s){
c<-s[1]
a1<-s[2]
a2<-s[2]

return(-sum())
}

optim(...)

In fact I need to know how to specify 0<=a1<=1. I've tried but without
success

Thank you 

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laist wrote:
> Hi,
> 
> I would like to know if you could help me... I need to restrict a parameter
> in a problem of optimization but I don't know how to do it.
> 
> function(s){
> c<-s[1]
> a1<-s[2]
> a2<-s[2]
> 
> return(-sum())
> }
> 
> optim(...)
> 
> In fact I need to know how to specify 0<=a1<=1. I've tried but
without
> success

In optim "L-BFGS-B" is a method that allows for box constraints. See
its
help page or provide a full example that we can use in order to give an 
example with your data / function different from those in ?optim.

Uwe Ligges





> 
> Thank you 
>