Dear Ramya
On 18 February 2011 05:08, Ramya <ramya.victory at gmail.com>
wrote:>
> http://r.789695.n4.nabble.com/file/n3312061/x_and_y_values.txt
> x_and_y_values.txt
>
>
> I have the absorbance values form HPLC Chromatogram. I need to find the
> peaks in datapoints and area under each peak.
>
> I am not sure how how to find the peaks, I tried couple of libraries and
> peak function but they return me a list of values which when computed from
> area turns out to be huge nnumbers. In the dataset I know there are 4 peaks
> but i couldnt find through R.
Using DrawChromatogram from OrgMassSpecR [1] for the main peak:
> library(OrgMassSpecR)
> dd <- read.csv("x_and_y_values.txt",sep="\t")
>
DrawChromatogram(dd$x,dd$y,range=list(start="490",stop="580"))
retentionTime peakArea apexIntensity
1 528.5 1276508 65845
seems to work fine for me.
[1] http://orgmassspecr.r-forge.r-project.org/
> getPeaks method was kind of promising but i am not sure how to use it.
Which getPeak do you mean? sessionInfo() would have given us some hints.
Hope this helps,
Laurent
> Any help would be appreciated.
>
> Thanks
> Ramya
> --
> View this message in context:
http://r.789695.n4.nabble.com/Find-peaks-in-dataset-x-y-and-area-for-each-peak-tp3312061p3312061.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>
--
[ Laurent Gatto | slashhome.be ]