## Sign Function

## Usage

    sign(x)

## Arguments

`x` | a numeric vector

## Description

`sign` returns a vector with the signs of the corresponding elements of `x` (the sign of a real number is 1, 0, or -1 if the number is positive, zero, or negative, respectively).

Note that `sign` does not operate on complex vectors.

## See Also

`abs`

## Examples

    sign(pi) # == 1
    sign(-2:3)# -1 -1 0 1 1 1

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