Havercosine

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

The half-value versed cosine is defined as

Installation

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

Usage

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

havercosf( x )

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

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

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

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

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

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

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

C APIs

Usage

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

stdlib_base_havercosf( x )

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

float out = stdlib_base_havercosf( 0.0f );
// returns 1.0f

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

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_havercosf( const float x );

Examples

#include "stdlib/math/base/special/havercosf.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_havercosf( x[ i ] );
        printf( "havercosf(%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.