# expm1
> Compute `exp(x) - 1`.
## Usage
```javascript
var expm1 = require( '@stdlib/math/base/special/expm1' );
```
#### expm1( x )
Computes `exp(x) - 1`, where `exp(x)` is the natural [exponential function][exponential-function].
```javascript
var v = expm1( 0.2 );
// returns ~0.221
v = expm1( -9.0 );
// returns ~-1.0
v = expm1( 0.0 );
// returns 0.0
v = expm1( NaN );
// returns NaN
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var expm1 = require( '@stdlib/math/base/special/expm1' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*10.0) - 5.0;
console.log( 'e^%d - 1 = %d', x, expm1( x ) );
}
```
[exponential-function]: https://en.wikipedia.org/wiki/Exponential_function