Compute sin(πx).
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> Compute the [sine][@stdlib/math/base/special/sin] of a number times [π][@stdlib/constants/float64/pi].
``bash`
npm install @stdlib/math-base-special-sinpi
`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
`
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var sinpi = require( '@stdlib/math-base-special-sinpi' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -100.0, 100.0, opts );
logEachMap( 'sin( π * %0.4f ) = %0.4f', x, sinpi );
`
*
`c`
#include "stdlib/math/base/special/sinpi.h"
#### stdlib_base_sinpi( x )
Computes sin(πx) more accurately than sin(pi*x), especially for large x.
`c`
double y = stdlib_base_sinpi( 0.5 );
// returns 1.0
The function accepts the following arguments:
- x: [in] double input value.
`c`
double stdlib_base_sinpi( const double x );
`c
#include "stdlib/math/base/special/sinpi.h"
#include
int main( void ) {
const double x[] = { 0.0, 0.523, 0.785, 1.047, 3.14 };
double y;
int i;
for ( i = 0; i < 5; i++ ) {
y = stdlib_base_sinpi( x[ i ] );
printf( "sinpi(%lf) = %lf\n", x[ i ], y );
}
}
`
*
- [@stdlib/math-base/special/sin][@stdlib/math/base/special/sin]: compute the sine of a number.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/math-base-special-sinpi/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-sinpi/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-sinpi/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-sinpi/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-sinpi/tree/esm
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[@stdlib/constants/float64/pi]: https://www.npmjs.com/package/@stdlib/constants-float64-pi
[@stdlib/math/base/special/sin]: https://www.npmjs.com/package/@stdlib/math-base-special-sin