Drop Redundant Extent Information

Usage

drop(x)

Value

If x is an object with a dim attribute (e.g. a matrix or array), then drop returns an object like x, but with any extents of length one removed. Any accompanying dimnames attribute is adjusted and returned with x.

Array subsetting ([) performs this reduction unless used with drop = FALSE, but sometimes it is useful to invoke drop directly.

See Also

drop1 which is used for dropping terms in models.

Examples

dim(drop(array(1:12, dim=c(1,3,1,1,2,1,2))))# = 3 2 2
drop(1:3 %*% 2:4)# scalar product