# incrrange
> Compute a [range][range] incrementally.
The [**range**][range] is defined as the difference between the maximum and minimum values.
## Usage
```javascript
var incrrange = require( '@stdlib/stats/incr/range' );
```
#### incrrange()
Returns an accumulator `function` which incrementally computes a [range][range].
```javascript
var accumulator = incrrange();
```
#### accumulator( \[x] )
If provided an input value `x`, the accumulator function returns an updated [range][range]. If not provided an input value `x`, the accumulator function returns the current [range][range].
```javascript
var accumulator = incrrange();
var range = accumulator( -2.0 );
// returns 0.0
range = accumulator( 1.0 );
// returns 3.0
range = accumulator( 3.0 );
// returns 5.0
range = accumulator();
// returns 5.0
```
## Notes
- Input values are **not** type checked. If provided `NaN`, the accumulated value is `NaN` for **all** future invocations. If non-numeric inputs are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var incrrange = require( '@stdlib/stats/incr/range' );
var accumulator;
var v;
var i;
// Initialize an accumulator:
accumulator = incrrange();
// For each simulated datum, update the range...
for ( i = 0; i < 100; i++ ) {
v = randu() * 100.0;
accumulator( v );
}
console.log( accumulator() );
```
[range]: https://en.wikipedia.org/wiki/Range_%28statistics%29