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209 changes: 209 additions & 0 deletions base/special/rcbrtf/README.md
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<!--
@license Apache-2.0
Copyright (c) 2024 The Stdlib Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

# rcbrtf

> Compute the reciprocal of the principal [cube root][cube-root] of a single-precision floating-point number.
<section class="intro">

The reciprocal of the principal [cube root][cube-root] is defined as

<!-- <equation class="equation" label="eq:reciprocal_cube_root" align="center" raw="\operatorname{rcbrt}(x)=\frac{1}{\sqrt[3]{x}}" alt="Reciprocal cube root"> -->

```math
\mathop{\mathrm{rcbrt}}(x)=\frac{1}{\sqrt[3]{x}}
```

<!-- <div class="equation" align="center" data-raw-text="\operatorname{rcbrt}(x)=\frac{1}{\sqrt[3]{x}}" data-equation="eq:reciprocal_cube_root">
<img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@b569df0e375cb7d535781320bf5e2299a0fbff25/lib/node_modules/@stdlib/math/base/special/rcbrt/docs/img/equation_reciprocal_cube_root.svg" alt="Reciprocal cube root">
<br>
</div> -->

<!-- </equation> -->

</section>

<!-- /.intro -->

<section class="usage">

## Usage

```javascript
var rcbrtf = require( '@stdlib/math/base/special/rcbrtf' );
```

#### rcbrtf( x )

Computes the reciprocal cube root of a single-precision floating-point number.

```javascript
var v = rcbrtf( 1.0 );
// returns 1.0

v = rcbrtf( 8.0 );
// returns 0.5

v = rcbrtf( 1000.0 );
// returns ~0.1

v = rcbrtf( 0.0 );
// returns Infinity

v = rcbrtf( NaN );
// returns NaN

v = rcbrtf( Infinity );
// returns 0.0
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var rcbrtf = require( '@stdlib/math/base/special/rcbrtf' );

var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = discreteUniform( 0.0, 100.0 );
console.log( 'rcbrtf(%d) = %d', x, rcbrtf( x ) );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/math/base/special/rcbrtf.h"
```

#### stdlib_base_rcbrtf( x )

Computes the reciprocal [cube root][cube-root] of a single-precision floating-point number.

```c
float y = stdlib_base_rcbrtf( 8.0f );
// returns 0.5f
```

The function accepts the following arguments:

- **x**: `[in] float` input value.

```c
float stdlib_base_rcbrtf( const float x );
```
</section>
<!-- /.usage -->
<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
<section class="notes">
</section>
<!-- /.notes -->
<!-- C API usage examples. -->
<section class="examples">
### Examples
```c
#include "stdlib/math/base/special/rcbrtf.h"
#include <stdio.h>
int main( void ) {
const float x[] = { 3.14f, 9.0f, 0.0f, 0.0f / 0.0f };
float y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_rcbrtf( x[ i ] );
printf( "rcbrt(%f) = %f\n", x[ i ], y );
}
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

[cube-root]: https://en.wikipedia.org/wiki/Cube_root

<!-- <related-links> -->

<!-- </related-links> -->

</section>

<!-- /.links -->
51 changes: 51 additions & 0 deletions base/special/rcbrtf/benchmark/benchmark.js
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/**
* @license Apache-2.0
*
* Copyright (c) 2024 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var bench = require( '@stdlib/bench' );
var randu = require( '@stdlib/random/base/randu' );
var isnanf = require( './../../../../base/assert/is-nanf' );
var pkg = require( './../package.json' ).name;
var rcbrtf = require( './../lib' );


// MAIN //

bench( pkg, function benchmark( b ) {
var x;
var y;
var i;

b.tic();
for ( i = 0; i < b.iterations; i++ ) {
x = ( randu() * 100000.0 ) - 0.0;
y = rcbrtf( x );
if ( isnanf( y ) ) {
b.fail( 'should not return NaN' );
}
}
b.toc();
if ( isnanf( y ) ) {
b.fail( 'should not return NaN' );
}
b.pass( 'benchmark finished' );
b.end();
});
60 changes: 60 additions & 0 deletions base/special/rcbrtf/benchmark/benchmark.native.js
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/**
* @license Apache-2.0
*
* Copyright (c) 2024 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var resolve = require( 'path' ).resolve;
var bench = require( '@stdlib/bench' );
var randu = require( '@stdlib/random/base/randu' );
var isnanf = require( './../../../../base/assert/is-nanf' );
var tryRequire = require( '@stdlib/utils/try-require' );
var pkg = require( './../package.json' ).name;


// VARIABLES //

var rcbrtf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
var opts = {
'skip': ( rcbrtf instanceof Error )
};


// MAIN //

bench( pkg+'::native', opts, function benchmark( b ) {
var x;
var y;
var i;

b.tic();
for ( i = 0; i < b.iterations; i++ ) {
x = ( randu() * 100000.0 ) - 0.0;
y = rcbrtf( x );
if ( isnanf( y ) ) {
b.fail( 'should not return NaN' );
}
}
b.toc();
if ( isnanf( y ) ) {
b.fail( 'should not return NaN' );
}
b.pass( 'benchmark finished' );
b.end();
});
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