R help - Aug 2009 - delete duplicated conditional

Hi,

have anybody a hint, how i could keep the duplicated with a condition in 
a second column,
i.e. maximum in column 620.
nodups <- apos[!duplicated(apos[,1]),c(1,620)]

many thanks
Christian

i get it.

aposSorted <- apos[order(apos[,620],decreasing=TRUE),]
nodups <- aposSorted[!duplicated(aposSorted[,1]),c(1,620)]

> Hi,
>
> have anybody a hint, how i could keep the duplicated with a condition 
> in a second column,
> i.e. maximum in column 620.
> nodups <- apos[!duplicated(apos[,1]),c(1,620)]
>
> many thanks
> Christian
>
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