drop {base} | R Documentation

## Drop Redundant Extent Information

### Description

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

### 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

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