[R] look for help on nlm in R

[Zhu, Maggie]

	Hi, 
	I had a hard time in learning nlm in R and appreciate any help. 
	I encounted the following error message from time to time when I tried different starting parameter values (three parameter values in this case) in nlm(f=SS.fun,p=c(0.1/40,0.1,2),hessian = FALSE,N.measure=object,h=20) 
	Error in f(x, ...) : only 0's may mix with negative subscripts 
	Basically I know the three parameter values should all be positive numbers. So, how to select appropriate starting parameter values to prevent this kind of error message? 
	Thanks much 
	Sincerely, 
	Maggie Zhu


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