[R] information about a function

[Petr Pikal]

Hi

seems to me like you are looking for lm or nls.

If not you shall be more specific.

HTH
Petr


On 17 Jul 2006 at 13:05, Holger Flick wrote:

Date sent:      	Mon, 17 Jul 2006 13:05:37 +0200
From:           	"Holger Flick" <hflick at gmail.com>
To:             	R-help at stat.math.ethz.ch
Subject:        	[R] information about a function

> Hi people,
> 
> I am new in this list and could not find a FAQ for it in particular,
> furthermore I could not find my question answered in the official R
> FAQ or docs.
> 
> I have simply something like this:
> 
> > f<-approxfun(data[,1],data[,2])
> 
> and f is:
> 
> > f
> function (v)
> .C("R_approx", as.double(x), as.double(y), as.integer(n), xout =
> as.double(v),
>     as.integer(length(v)), as.integer(method), as.double(yleft),
>     as.double(yright), as.double(f), NAOK = TRUE, PACKAGE =
>     "base")$xout
> <environment: 02106C24>
> 
> I also used "locPoly".
> 
> Both yield either a function or a data frame of values.
> 
> Is there a way to get a mathematical representation of the function,
> e.g. a polynomial of any order? Something like
>  ax^3+bx^2+cx^1+d or similar if it is of degree 3?
> 
> Basically, I want to create functions of measured values.
> 
> Thanks in advance for any hints.
> 
> --
> Holger
> 
> 
> 
> -- 
> Holger
> 
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Petr Pikal
petr.pikal at precheza.cz