Haversine

Compute the half-value versed sine of a single-precision floating-point number (in radians).

The half-value versed sine is defined as

Installation

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

Usage

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

haversinf( x )

Computes the half-value versed sine of a single-precision floating-point number (in radians).

var v = haversinf( 0.0 );
// returns 0.0

v = haversinf( 3.141592653589793/2.0 );
// returns 0.5

v = haversinf( -3.141592653589793/6.0 );
// returns ~0.067

Examples

var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var TWO_PI = require( '@stdlib/constants-float32-two-pi' );
var haversinf = require( '@stdlib/math-base-special-haversinf' );

var opts = {
    'dtype': 'float32'
};
var x = uniform( 100, 0.0, TWO_PI, opts );

logEachMap( 'haversinf(%0.4f) = %0.4f', x, haversinf );

C APIs

Usage

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

stdlib_base_haversinf( x )

Computes the half-value versed sine of a single-precision floating-point number (in radians).

float out = stdlib_base_haversinf( 0.0f );
// returns 0.0f

out = stdlib_base_haversinf( 3.141592653589793f / 2.0f );
// returns 0.5f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_haversinf( const float x );

Examples

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

int main( void ) {
    const float x[] = { 0.0f, 0.523f, 0.785f, 1.047f, 3.14f };

    float y;
    int i;
    for ( i = 0; i < 5; i++ ) {
        y = stdlib_base_haversinf( x[ i ] );
        printf( "haversinf(%f) = %f\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.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.