Hi
r-help-boun...@r-project.org napsal dne 28.07.2009 17:34:35:
> I am currently summarising a data set by collapsing data based on common
> identifiers in a column. I am using the 'aggregate' function to
summarise
> numeric columns, i.e. "aggregate(dat[,3], list(dat$gene), mean)". I
also wish
> to summarise text columns e.g. by concatenating values in a comma
separated
> list, but the aggregate function can only return scalar values and so
> something like "aggregate(dat[,3], list(dat$gene), cat)" will not work.
Is
> there a simple function like aggregate that works for strings in R?
Try
aggregate(dat[,3], list(dat$gene), paste, collapse=",")
Regards
Petr
>
>
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