# Absolute Difference
> Compute the [absolute difference][absolute-difference] of two real numbers.
The [absolute difference][absolute-difference] of two real `numbers` is defined as the absolute value of their difference.
## Usage
```javascript
var absdiff = require( '@stdlib/math/base/utils/absolute-difference' );
```
#### absdiff( x, y )
Computes the [absolute difference][absolute-difference] of two real numbers.
```javascript
var d = absdiff( 2.0, 5.0 );
// returns 3.0
d = absdiff( -1.0, 3.14 );
// returns ~4.14
d = absdiff( 10.1, -2.05 );
// returns ~12.15
d = absdiff( -0.0, 0.0 );
// returns +0.0
d = absdiff( NaN, 5.0 );
// returns NaN
d = absdiff( 5.0, NaN );
// returns NaN
d = absdiff( Infinity, Infinity );
// returns NaN
d = absdiff( -Infinity, -Infinity );
// returns NaN
d = absdiff( Infinity, -Infinity );
// returns Infinity
d = absdiff( -Infinity, Infinity );
// returns Infinity
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var absdiff = require( '@stdlib/math/base/utils/absolute-difference' );
var x;
var y;
var d;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*1.0e4) - 1.0e2;
y = (randu()*1.0e4) - 1.0e2;
d = absdiff( x, y );
console.log( 'x = %d. y = %d. |x-y| = %d.', x, y, d );
}
```
[absolute-difference]: https://en.wikipedia.org/wiki/Absolute_difference
