Compute sin(πx) in single-precision floating-point format.
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> Compute the [sine][@stdlib/math/base/special/sinf] of a number times [π][@stdlib/constants/float32/pi].
``bash`
npm install @stdlib/math-base-special-sinpif
`javascript`
var sinpif = require( '@stdlib/math-base-special-sinpif' );
#### sinpif( x )
Computes sin(πx) in single-precision floating-point format more accurately than sin(pi*x), especially for large x.
`javascript
var y = sinpif( 0.0 );
// returns 0.0
y = sinpif( 0.5 );
// returns 1.0
y = sinpif( 0.9 );
// returns ~0.309
y = sinpif( NaN );
// returns NaN
`
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var sinpif = require( '@stdlib/math-base-special-sinpif' );
var opts = {
'dtype': 'float32'
};
var x = uniform( 100, -100.0, 100.0, opts );
logEachMap( 'sin( π * %0.4f ) = %0.4f', x, sinpif );
`
*
`c`
#include "stdlib/math/base/special/sinpif.h"
#### stdlib_base_sinpif( x )
Computes sin(πx) in single-precision floating-point format more accurately than sin(pi*x), especially for large x.
`c`
float y = stdlib_base_sinpif( 0.5f );
// returns 1.0f
The function accepts the following arguments:
- x: [in] float input value.
`c`
float stdlib_base_sinpif( const float x );
`c
#include "stdlib/math/base/special/sinpif.h"
#include
int main( void ) {
const float x[] = { 0.0f, 0.523f, 0.785f, 1.047f, 3.14f };
float y;
int i;
for ( i = 0; i < 5; i++ ) {
y = stdlib_base_sinpif( x[ i ] );
printf( "sin( π * %f ) = %f\n", x[ i ], y );
}
}
`
*
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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[@stdlib/math/base/special/sinf]: https://www.npmjs.com/package/@stdlib/math-base-special-sinf
[@stdlib/constants/float32/pi]: https://www.npmjs.com/package/@stdlib/constants-float32-pi