[R] Algorythmic Question on Array Filtration

John Kane jrkrideau at yahoo.ca
Fri Jul 13 19:19:13 CEST 2007

I think we need a bit more information and perhaps a
small example data set to see what you want.  

I am not familiar with term mass window. Is this a
confidence interval around the mass value? 

--- Johannes Graumann <johannes_graumann at web.de>

> Dear All,
> I have a data frame with the columns "Mass" and
> "Intensity" (this is mass
> spectrometry stuff). Each of the mass values gives
> rise to a mass window of
> 5 ppm around the individual mass (from mass -
> mass/1E6*5 to mass +
> mass/1E5*5). I need to filter the array such that in
> case these mass
> windows overlap I retain the mass/intensity pair
> with the highest
> intensity.
> I apologize for this question, but I have no formal
> IT education and would
> value any nudges toward favorable algorithmic
> solutions highly.
> Thanks for any help,
> Joh
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