kjetil brinchmann halvorsen
kjetil at entelnet.bo
Fri Jan 17 13:25:05 CET 2003
On 16 Jan 2003 at 22:15, Yan Yu wrote:
> 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.
> Error in match.call(definition, call, expand.dots) :
> .Primitive... is not a function
> Any idea on what is the problem?
> many thanks,
> R-help at stat.math.ethz.ch mailing list
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