R: Fast conditional sum

condSum {ffbase}

R Documentation

Fast conditional sum

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

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

`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

array with dimensions of index

[Package ffbase version 0.12.8 Index]