@stdlib/math-base-special-sinpi NPM

sinpi

$NPM version$ $Build Status$ $Coverage Status$

Compute the sine of a number times π.

Installation

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

Usage

var sinpi = require( '@stdlib/math-base-special-sinpi' );

sinpi( x )

Computes sin(πx) more accurately than sin(pi*x), especially for large x.

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

var linspace = require( '@stdlib/array-base-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 ] ) );
}

C APIs

Usage

#include "stdlib/math/base/special/sinpi.h"

stdlib_base_sinpi( x )

Computes sin(πx) more accurately than sin(pi*x), especially for large x.

double y = stdlib_base_sinpi( 0.5 );
// returns 1.0

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_sinpi( const double x );

Examples

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

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 );
    }
}

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.