Delete the dimensions of an array which have only one level.

`drop(x)`

x

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
`drop`

directly.

`drop1`

which is used for dropping terms in models.

# NOT RUN { 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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