R: Extension of 'rowsum'

groupsum {arrayhelpers}

R Documentation

Extension of `rowsum`

groupsum extends rowsum: it allows group to be an array of the same shape as x.

groupsum(x, group = NULL, dim = 1L, reorder = TRUE, na.rm = FALSE, ...,
  drop = !is.array(x))

`x`	array to be `rowsum`med
`group`	grouping variable (integer or factor) indicating groups of samples.
`dim`	along which dimension should the group sums be taken? (default: rows)
`reorder`	should the groups be ordered? see `rowsum`
`na.rm`	shoud `NA`s be removed?
`...`	ignored
`drop`	should 1d arrays drop to vectors?

like rowsum, but further dimensions of the array are preserved.

Claudia Beleites