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# sinpi

> Compute the [sine][@stdlib/math/base/special/sin] of a number times [π][@stdlib/constants/float64/pi].

<section class="usage">

## 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
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```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 ] ) );
}
```

</section>

<!-- /.examples -->

<section class="links">

[@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

</section>

<!-- /.links -->