time-to-botec/js/node_modules/@stdlib/math/base/special/havercos/README.md

Havercosine

Compute the half-value versed cosine.

The half-value versed cosine is defined as

Usage

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

havercos( x )

Computes the half-value versed cosine (in radians).

var v = havercos( 0.0 );
// returns 1.0

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

v = havercos( -3.141592653589793/6.0 );
// returns ~0.9330

Examples

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

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

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