stdlib-js
<summary>
About stdlib...
</summary>
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
Arcvercosine
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
Compute the [inverse versed cosine][inverse-versed-cosine].
bash
npm install @stdlib/math-base-special-avercos
javascript
var avercos = require( '@stdlib/math-base-special-avercos' );
#### avercos( x )
Computes the [inverse versed cosine][inverse-versed-cosine].
javascript
var v = avercos( 0.0 );
// returns 0.0
v = avercos( -3.141592653589793/2.0 );
// returns ~2.1783
v = avercos( -3.141592653589793/6.0 );
// returns ~1.0742
If x < -2, x > 0, or x is NaN, the function returns NaN.
javascript
var v = avercos( 1.0 );
// returns NaN
v = avercos( -3.14 );
// returns NaN
v = avercos( NaN );
// returns NaN
javascript
var linspace = require( '@stdlib/array-base-linspace' );
var avercos = require( '@stdlib/math-base-special-avercos' );
var x = linspace( -2.0, 0.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( avercos( x[ i ] ) );
}
c
#include "stdlib/math/base/special/avercos.h"
#### stdlib_base_avercos( x )
Compute the [inverse versed cosine][inverse-versed-cosine] of a double-precision floating-point number (in radians).
c
double out = stdlib_base_avercos( -3.141592653589793/2.0 );
// returns ~2.1783
If x < -2, x > 0, or x is NaN, the function returns NaN.
c
double out = stdlib_base_avercos( -3.141592653589793 );
// returns NaN
The function accepts the following arguments:
- x: [in] double input value.
c
double stdlib_base_avercos( const double x );
c
#include "stdlib/math/base/special/avercos.h"
#include <stdio.h>
int main( void ) {
const double x[] = { -2.5, -2.0, -1.5, -1.0, -0.5, 0.5, 1.0, 1.5, 2.0, 2.5 };
double v;
int i;
for ( i = 0; i < 10; i++ ) {
v = stdlib_base_avercos( x[ i ] );
printf( "avercos(%lf) = %lf\n", x[ i ], v );
}
}
@stdlib/math-base/special/aversin][@stdlib/math/base/special/aversin]: compute the inverse versed sine.
- [@stdlib/math-base/special/versin][@stdlib/math/base/special/versin]: compute the versed sine.
