[R] spline interpolation
David Winsemius
dwinsemius at comcast.net
Sat Feb 5 16:24:04 CET 2011
On Feb 5, 2011, at 9:29 AM, 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.
?spline
> (2)How can I interpolation,say 1000 point from 0nM-100nM and store
> this as a
> data frame of concentration,fluorescence
?approxfun
> (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.
?which.min #(although I would be using "[" rather than subset for
that purpose.)
>
> subset(df,fluorescence==200.3456,select=concentration)
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
David Winsemius, MD
West Hartford, CT
More information about the R-help
mailing list