R help - Dec 2006 - Constraint Optimization problem.

Dear all R users,

I have a optimization problem like this:

f(x,y) is a function with two variables, x, and y. Variable x is unbounded
but y lies between [-10, 10].  I want to minimize f(x,y) subject to a
constraint x + y < 5. Can anyone tell me which R function should I use. I
already gone through ?constrOptim. But here I cannot specify lower and upper
bounds for x, and y. However if I use ?optim function then I can not specify
the constraint.

can anyone give me any clue?

any help will be highly appreciated.

Thanks and regards,
Arun

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