[R] Algorythmic Question on Array Filtration

Adaikalavan Ramasamy ramasamy at cancer.org.uk
Fri Jul 13 18:51:53 CEST 2007

Sorry, this sounds like a fairly basic question that can be resolved by 
which() and possible ifelse(). There is no details in your email.

I am afraid you have to learn the basics of R or ask question with more 
details (e.g. example data).

Or ask someone locally.

Regards, Adai

Johannes Graumann wrote:
> 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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