sinpif

Compute the sine of a number times π.

Installation

npm install @stdlib/math-base-special-sinpif

Usage

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.

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

Examples

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 APIs

Usage

#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.

float y = stdlib_base_sinpif( 0.5f );
// returns 1.0f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_sinpif( const float x );

Examples

#include "stdlib/math/base/special/sinpif.h"
#include <stdio.h>

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 );
    }
}

Notice

This package is part of 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, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.