@stdlib/math-base-special-avercos
v0.3.0
Published
Compute the inverse versed cosine.
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Arcvercosine
Compute the inverse versed cosine.
The inverse versed cosine is defined as
Installation
npm install @stdlib/math-base-special-avercos
Usage
var avercos = require( '@stdlib/math-base-special-avercos' );
avercos( x )
Computes the inverse versed cosine.
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
.
var v = avercos( 1.0 );
// returns NaN
v = avercos( -3.14 );
// returns NaN
v = avercos( NaN );
// returns NaN
Examples
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 APIs
Usage
#include "stdlib/math/base/special/avercos.h"
stdlib_base_avercos( x )
Compute the inverse versed cosine of a double-precision floating-point number (in radians).
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
.
double out = stdlib_base_avercos( -3.141592653589793 );
// returns NaN
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_avercos( const double x );
Examples
#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 );
}
}
See Also
@stdlib/math-base/special/aversin
: compute the inverse versed sine.@stdlib/math-base/special/versin
: compute the versed sine.
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 © 2016-2024. The Stdlib Authors.