Drop Redundant Extent Information
Delete the dimensions of an array which have only one level.
- an array (including a matrix).
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: if the result is a vector the names are taken from
the dimnames (if any). If the result is a length-one vector,
the names are taken from the first dimension with a dimname.Array subsetting ([) performs this reduction unless used
with drop = FALSE, but sometimes it is useful to invoke
drop1 which is used for dropping terms in models.
dim(drop(array(1:12, dim = c(1,3,1,1,2,1,2)))) # = 3 2 2 drop(1:3 %*% 2:4) # scalar product
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