Haversine
Compute the half-value versed sine.
The half-value versed sine is defined as
Usage
var haversin = require( '@stdlib/math/base/special/haversin' );
haversin( x )
Computes the half-value versed sine (in radians).
var v = haversin( 0.0 );
// returns 0.0
v = haversin( 3.141592653589793/2.0 );
// returns ~0.5
v = haversin( -3.141592653589793/6.0 );
// returns ~0.06699
Examples
var linspace = require( '@stdlib/array/base/linspace' );
var TWO_PI = require( '@stdlib/constants/float64/two-pi' );
var haversin = require( '@stdlib/math/base/special/haversin' );
var x = linspace( 0.0, TWO_PI, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( haversin( x[ i ] ) );
}