# sinpi
> Compute the [sine][@stdlib/math/base/special/sin] of a number times [π][@stdlib/constants/float64/pi].
## Usage
```javascript
var sinpi = require( '@stdlib/math/base/special/sinpi' );
```
#### sinpi( x )
Computes `sin(πx)` more accurately than `sin(pi*x)`, especially for large `x`.
```javascript
var y = sinpi( 0.0 );
// returns 0.0
y = sinpi( 0.5 );
// returns 1.0
y = sinpi( 0.9 );
// returns ~0.309
y = sinpi( NaN );
// returns NaN
```
## Examples
```javascript
var linspace = require( '@stdlib/array/linspace' );
var sinpi = require( '@stdlib/math/base/special/sinpi' );
var x = linspace( -100.0, 100.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( sinpi( x[ i ] ) );
}
```
[@stdlib/math/base/special/sin]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/sin
[@stdlib/constants/float64/pi]: https://www.npmjs.com/package/@stdlib/constants-float64-pi