ahaversinf

Compute the inverse half-value versed sine of a single-precision floating-point number.

The inverse half-value versed sine is defined as

Installation

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

Usage

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

ahaversinf( x )

Computes the inverse half-value versed sine of a single-precision floating-point number.

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

v = ahaversinf( 1.0 );
// returns ~3.1416

v = ahaversinf( 0.5 );
// returns ~1.5708

If x < 0, x > 1, or x is NaN, the function returns NaN.

var v = ahaversinf( 1.5 );
// returns NaN

v = ahaversinf( -3.14 );
// returns NaN

v = ahaversinf( NaN );
// returns NaN

Examples

var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var ahaversinf = require( '@stdlib/math-base-special-ahaversinf' );

var x = uniform( 100, 0.0, 1.0, {
    'dtype': 'float32'
});

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

C APIs

Usage

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

stdlib_base_ahaversinf( x )

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

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

If x < 0, x > 1, or x is NaN, the function returns NaN.

float out = stdlib_base_ahaversinf( -3.14f );
// returns NaN

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_ahaversinf( const float x );

Examples

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

int main( void ) {
    const float x[] = { -2.0f, -1.6f, -1.2f, -0.8f, -0.4f, 0.4f, 0.8f, 1.2f, 1.6f, 2.0f };

    float v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_ahaversinf( x[ i ] );
        printf( "ahaversin(%f) = %f\n", x[ i ], v );
    }
}

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.