@stdlib/math-base-special-kernel-sin

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kernelSin

Compute the sine of a double-precision floating-point number on [-π/4, π/4].

Installation

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

Usage

var kernelSin = require( '@stdlib/math-base-special-kernel-sin' );

kernelSin( x, y )

Computes the sine of a double-precision floating-point number on [-π/4, π/4].

var v = kernelSin( 0.0, 0.0 );
// returns ~0.0

v = kernelSin( 3.141592653589793/6.0, 0.0 );
// returns ~0.5

v = kernelSin( 0.619, 9.279e-18 );
// returns ~0.58

v = kernelSin( NaN, 0.0 );
// returns NaN

v = kernelSin( 3.0, NaN );
// returns NaN

v = kernelSin( NaN, NaN );
// returns NaN

Notes

• For increased accuracy, the number for which the sine should be evaluated can be supplied as a double-double number (i.e., a non-evaluated sum of two double-precision floating-point numbers x and y).

• As components of a double-double number, the two double-precision floating-point numbers x and y must satisfy

  
  

  where ulp stands for units in the last place.

Examples

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

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

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

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C APIs

Usage

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

stdlib_base_kernel_sin( x, y )

Computes the sine of a double-precision floating-point number on [-π/4, π/4].

double out = stdlib_base_kernel_sin( 0.0, 0.0 );
// returns ~0.0

out = stdlib_base_kernel_sin( 0.619, 9.279e-18 );
// returns ~0.58

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.

double stdlib_base_kernel_sin( const double x, const double y );

Notes

• For increased accuracy, the number for which the sine should be evaluated can be supplied as a double-double number (i.e., a non-evaluated sum of two double-precision floating-point numbers x and y).

Examples

#include "stdlib/math/base/special/kernel_sin.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 out;
    int i;
    for ( i = 0; i < 10; i++ ) {
        out = stdlib_base_kernel_sin( x[ i ], 0.0 );
        printf ( "x: %lf, y: %lf, out: %lf\n", x[ i ], 0.0, out );
    }
}

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See Also

• @stdlib/math-base/special/kernel-cos: compute the cosine of a double-precision floating-point number on [-π/4, π/4].
• @stdlib/math-base/special/kernel-tan: compute the tangent of a double-precision floating-point number on [-π/4, π/4].
• @stdlib/math-base/special/sin: compute the sine of a number.

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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

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Copyright

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