ffbase (version 0.6-2)

condSum: Fast conditional sum

Description

condSum works like a very fast version of tapply with FUN=sum.

Usage

condSum(x, index, na.rm = FALSE, ...)

Arguments

x

numeric vector to be summed

index

(list of) factor(s) for which the sum will be calculated

na.rm

logical If TRUE NA values will be removed

...

not used

Value

• array with dimensions of index