[R] spline interpolation

[Mike Marchywka]

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> Date: Sat, 5 Feb 2011 18:08:43 +0100
> From: cbeleites at units.it
> To: r-help at r-project.org
> Subject: Re: [R] spline interpolation
>
> Hi,
>
> Just pure curiosity:
> may I ask why you want to do spline interplation on fluorescence intensity as
> function of concentration?
> Particularly as it looks quite typical for an unknown problem's calibration plot?


I would mention of course the suggestions given are not typically the end of the story.
Instead of a bunch of splines, you may get a better result by writing a differential
equation for the kinetics of the system you have, setting time derivatives to zero, and try to
estimate things like lifetime-concentration combinations. Is that your point or you
think this is a homework problem LOL? 



>
> Claudia
>
>
>
>
>
>
> On 02/05/2011 03:29 PM, Asan Ramzan wrote:
> > Hello R-help
> > I have the following data for a standard curve
> > concentration(nM),fluorescence
> > 0,48.34
> > 2,58.69
> > 5,70.83
> > 10,94.73
> > 20,190.8
> > 50,436.0
> > 100,�957.9
> > �
> > (1)Is there function in R�to plot a spline.
> > (2)How can I interpolation,say 1000 point from 0nM-100nM and store this as a
> > data frame of concentration,fluorescence
> > (3)How can I modify�the code below so that instead of retrieving a concentration
> > with the exact value of fluorescence, it gives me concentration for the value
> > that is closest to that fluorescence.
> > �
> > subset(df,fluorescence==200.3456,select=concentration)
> >
> >
> >
> > [[alternative HTML version deleted]]
> >
> >
> >
> >
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>
>
> --
> Claudia Beleites
> Dipartimento dei Materiali e delle Risorse Naturali
> Università degli Studi di Trieste
> Via Alfonso Valerio 6/a
> I-34127 Trieste
>
> phone: +39 0 40 5 58-37 68
> email: cbeleites at units.it
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.