[R] Non-linear fit?

[Judson]

I need to fit a sinusoidal curve to 
x-y data that exhibits a sinusoidal 
pattern.   The curve will be: 
 y = a*sin(w*x +p) ; 
where I need to get the best 
fit choice for the parameters 
a, w, and p.   Could anyone 
suggest which package and 
routine I should use?   I have 
less than 1000 data points. 
Can this problem be somehow 
coerced into a linear fit?     
....... judson blake 		 	   		  
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