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?
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