sincos

Simultaneously compute the sine and cosine of a number.

Usage

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

sincos( x )

Simultaneously computes the sine and cosine of a number (in radians).

var v = sincos( 0.0 );
// returns [ ~0.0, ~1.0 ]

v = sincos( 3.141592653589793/2.0 );
// returns [ ~1.0, ~0.0 ]

v = sincos( -3.141592653589793/6.0 );
// returns [ ~-0.5, ~0.866 ]

sincos.assign( x, out, stride, offset )

Simultaneously computes the sine and cosine of a number (in radians) and assigns results to a provided output array.

var Float64Array = require( '@stdlib/array/float64' );

var out = new Float64Array( 2 );

var v = sincos.assign( 0.0, out, 1, 0 );
// returns <Float64Array>[ ~0.0, ~1.0 ]

var bool = ( v === out );
// returns true

Examples

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

var x = linspace( 0.0, TWO_PI, 100 );

var i;
for ( i = 0; i < x.length; i++ ) {
    console.log( sincos( x[ i ] ) );
}

C APIs

Usage

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

stdlib_base_sincos( x, &sine, &cosine )

Simultaneously computes the sine and cosine of a number (in radians).

double cosine;
double sine;

stdlib_base_sincos( 4.0, &sine, &cosine );

The function accepts the following arguments:

x: [in] double input value.
sine: [out] double* destination for the sine.
cosine: [out] double* destination for the cosine.

void stdlib_base_sincos( const double x, double *sine, double *cosine );

Examples

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

int main( void ) {
    const double x[] = { 0.0, 1.57, 3.14, 6.28 };

    double cosine;
    double sine;
    int i;
    for ( i = 0; i < 4; i++ ) {
        stdlib_base_sincos( x[ i ], &sine, &cosine );
        printf( "x: %lf => sine: %lf, cosine: %lf\n", x[ i ], sine, cosine );
    }
}