[R] spline interpolation

[Claudia Beleites]

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?

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