Dear Ramya
On 18 February 2011 05:08, Ramya <ramya.vict...@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
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--
[ Laurent Gatto | slashhome.be ]
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