kernelSincos

Simultaneously compute the sine and cosine of an angle measured in radians on the interval [-π/4, π/4].

Installation

npm install @stdlib/math-base-special-kernel-sincos

Usage

var kernelSincos = require( '@stdlib/math-base-special-kernel-sincos' );

kernelSincos( x, y, out, stride, offset )

Simultaneously computes the sine and cosine of an angle measured in radians on the interval [-π/4, π/4].

var v = kernelSincos( 0.0, 0.0, [ 0.0, 0.0 ], 1, 0 );
// returns [ ~0.0, ~1.0 ]

v = kernelSincos( 3.141592653589793/2.0, 0.0, [ 0.0, 0.0 ], 1, 0 );
// returns [ ~1.0, ~0.0 ]

v = kernelSincos( -3.141592653589793/6.0, 0.0, [ 0.0, 0.0 ], 1, 0 );
// returns [ ~-0.5, ~0.866 ]

v = kernelSincos( NaN, 0.0, [ 0.0, 0.0 ], 1, 0 );
// returns [ NaN, NaN ]

Examples

var linspace = require( '@stdlib/array-base-linspace' );
var PI = require( '@stdlib/constants-float64-pi' );
var kernelSincos = require( '@stdlib/math-base-special-kernel-sincos' );

var x = linspace( -PI/4.0, PI/4.0, 100 );

var y;
var i;
for ( i = 0; i < x.length; i++ ) {
    y = kernelSincos( x[ i ], 0.0, [ 0.0, 0.0 ], 1, 0 );
    console.log( 'kernelSincos(%d) = [ %d, %d ]', x[ i ], y[ 0 ], y[ 1 ] );
}

C APIs

Usage

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

stdlib_base_kernel_sincos( x, y, &sine, &cosine )

Simultaneously computes the sine and cosine of an angle measured in radians on the interval [-π/4, π/4].

double cosine;
double sine;

stdlib_base_kernel_sincos( 0.0, 0.0, &sine, &cosine );

The function accepts the following arguments:

• x: [in] double input value (in radians, assumed to be bounded by ~pi/4 in magnitude).
• y: [in] double tail of x.
• sine: [out] double* destination for the sine.
• cosine: [out] double* destination for the cosine.

void stdlib_base_kernel_sincos( const double x, const double y, double* sine, double* cosine );

Examples

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

int main( void ) {
    const double x[] = { -0.7853981633974483, -0.6108652381980153, -0.4363323129985824, -0.26179938779914946, -0.08726646259971649, 0.08726646259971649, 0.26179938779914935, 0.43633231299858233, 0.6108652381980153, 0.7853981633974483 };

    double cosine;
    double sine;
    int i;
    for ( i = 0; i < 10; i++ ) {
        stdlib_base_kernel_sincos( x[ i ], 0.0, &sine, &cosine );
        printf( "x: %lf => sine: %lf, cosine: %lf\n", x[ i ], sine, cosine );
    }
}

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

Copyright

Copyright © 2016-2026. The Stdlib Authors.