[R] function optimization

[garciap]

Dear all,

this is my first time, and just begin to use R. But I've a question about
optimization using optimx library. It could sound stupid by I'm a bit
affraid with the problem, because anything I try, anything Error. 
The procedure was:
optimx(par="10,71,1",fn=(Prey*Provisioning)/Risk, control=list("maximize))

well the problem lies in the initial value parameters, again and again, R
tells me that it is not possible to optimize the function at this values,
even though these are real estimations.

Any suggestion?

Pablo
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