groupsum: Extension of rowsum
Description
groupsum extends rowsum: it allows
group to be an array of the same shape as
x.Usage
groupsum(x, group = NULL, dim = 1L, reorder = TRUE,
na.rm = FALSE, ..., drop = !is.array(x))Arguments
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 NAs be removed?
drop
should 1d arrays drop to vectors?
Value
- like
rowsum, but further dimensions
of the array are preserved.