sincos

Simultaneously compute the sine and cosine of a number.

Installation

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

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 );
    }
}

See Also

• @stdlib/math-base/special/cos: compute the cosine of a number.
• @stdlib/math-base/special/sin: compute the sine of a number.
• @stdlib/math-base/special/sincospi: simultaneously compute the sine and cosine of a number times π.

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.

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Copyright

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