R help - Sep 2010 - nlinfit equivalent in R

Hi,

Is there a function in R that's equivalent of nlinfit in Matlab? I'd
like to find parameters in a pre-determined form: x(t) ~
sum(beta1/beta2^i*x(t-i)) where i = 1,2,3....n (n could be large)

Thanks,

Yingmei


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