[R] optimization on a circle

[Martina Erdbrügge]

Hi all,	

after conducting a central composite design, I would like to optimize
the estimated function on a circle (resp. globe) instead of a square
(resp. cube), since the optimum will be reached on the bounds. 
Is there a function in R which could be used for this purpose? I'm using
optim() with method = "L-BFGS-B" for the optimization on a square or
cube.

Thanks in advance for any hints,
Martina Erdbrügge
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