Re: [R] information about a function

From: Petr Pikal <petr.pikal_at_precheza.cz>
Date: Mon 17 Jul 2006 - 21:51:43 EST


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@gmail.com>
To:             	R-help@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@precheza.cz



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Jul 17 21:57:33 2006

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