[R] nls

[kjetil brinchmann halvorsen]

On 16 Jan 2003 at 22:15, Yan Yu wrote:

> HI,
> i have some prob when i try to use nls().
> my data is 1D vector, I tried to use a polynomial function(order is 3) to
> fit it.
> the data series is stored in x.
> the a0, a1, a2, a3 below is coefficient, which i  hope i can get from
> calls "nls"
> 
> > z <-  nls(  ~ a0 + a1 * x + a2 * x * x + a3 * x * x * x, data = x )

You haven't given a response in the formula? nls could possibly give 
a more informative error message.

Kjetil Halvorsen



> Error in match.call(definition, call, expand.dots) :
> 	.Primitive... is not a function
> 
> Any idea on what is the problem?
> 
> many thanks,
> yan
> 
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