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‎CHANGELOG.md‎

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<!-- /.package -->
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<section class="package" id="stats-base-dists-f-skewness-unreleased">
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#### [@stdlib/stats/base/dists/f/skewness](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/f/skewness)
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<details>
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<section class="features">
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##### Features
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- [`9c225d9`](https://github.com/stdlib-js/stdlib/commit/9c225d9d649ffd725037384783d67f9dddee87a4) - add C implementation for `stats/base/dists/f/skewness` [(#4041)](https://github.com/stdlib-js/stdlib/pull/4041)
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</section>
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<!-- /.features -->
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<section class="issues">
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##### Closed Issues
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This release closes the following issue:
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[#3601](https://github.com/stdlib-js/stdlib/issues/3601)
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</section>
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<!-- /.issues -->
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</details>
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</section>
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<!-- /.package -->
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<section class="package" id="stats-base-dists-f-variance-unreleased">
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#### [@stdlib/stats/base/dists/f/variance](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/f/variance)
@@ -2406,9 +2440,9 @@ A total of 3 issues were closed in this release:
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### Closed Issues
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A total of 72 issues were closed in this release:
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A total of 73 issues were closed in this release:
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2411-
[#1619](https://github.com/stdlib-js/stdlib/issues/1619), [#1632](https://github.com/stdlib-js/stdlib/issues/1632), [#1633](https://github.com/stdlib-js/stdlib/issues/1633), [#3236](https://github.com/stdlib-js/stdlib/issues/3236), [#3237](https://github.com/stdlib-js/stdlib/issues/3237), [#3238](https://github.com/stdlib-js/stdlib/issues/3238), [#3378](https://github.com/stdlib-js/stdlib/issues/3378), [#3384](https://github.com/stdlib-js/stdlib/issues/3384), [#3385](https://github.com/stdlib-js/stdlib/issues/3385), [#3401](https://github.com/stdlib-js/stdlib/issues/3401), [#3402](https://github.com/stdlib-js/stdlib/issues/3402), [#3410](https://github.com/stdlib-js/stdlib/issues/3410), [#3414](https://github.com/stdlib-js/stdlib/issues/3414), [#3417](https://github.com/stdlib-js/stdlib/issues/3417), [#3421](https://github.com/stdlib-js/stdlib/issues/3421), [#3431](https://github.com/stdlib-js/stdlib/issues/3431), [#3434](https://github.com/stdlib-js/stdlib/issues/3434), [#3435](https://github.com/stdlib-js/stdlib/issues/3435), [#3436](https://github.com/stdlib-js/stdlib/issues/3436), [#3438](https://github.com/stdlib-js/stdlib/issues/3438), [#3445](https://github.com/stdlib-js/stdlib/issues/3445), [#3446](https://github.com/stdlib-js/stdlib/issues/3446), [#3447](https://github.com/stdlib-js/stdlib/issues/3447), [#3480](https://github.com/stdlib-js/stdlib/issues/3480), [#3494](https://github.com/stdlib-js/stdlib/issues/3494), [#3501](https://github.com/stdlib-js/stdlib/issues/3501), [#3510](https://github.com/stdlib-js/stdlib/issues/3510), [#3548](https://github.com/stdlib-js/stdlib/issues/3548), [#3582](https://github.com/stdlib-js/stdlib/issues/3582), [#3585](https://github.com/stdlib-js/stdlib/issues/3585), [#3588](https://github.com/stdlib-js/stdlib/issues/3588), [#3591](https://github.com/stdlib-js/stdlib/issues/3591), [#3592](https://github.com/stdlib-js/stdlib/issues/3592), [#3595](https://github.com/stdlib-js/stdlib/issues/3595), [#3596](https://github.com/stdlib-js/stdlib/issues/3596), [#3597](https://github.com/stdlib-js/stdlib/issues/3597), [#3598](https://github.com/stdlib-js/stdlib/issues/3598), [#3603](https://github.com/stdlib-js/stdlib/issues/3603), [#3656](https://github.com/stdlib-js/stdlib/issues/3656), [#3671](https://github.com/stdlib-js/stdlib/issues/3671), [#3701](https://github.com/stdlib-js/stdlib/issues/3701), [#3709](https://github.com/stdlib-js/stdlib/issues/3709), [#3721](https://github.com/stdlib-js/stdlib/issues/3721), [#3738](https://github.com/stdlib-js/stdlib/issues/3738), [#3739](https://github.com/stdlib-js/stdlib/issues/3739), [#3741](https://github.com/stdlib-js/stdlib/issues/3741), [#3744](https://github.com/stdlib-js/stdlib/issues/3744), [#3746](https://github.com/stdlib-js/stdlib/issues/3746), [#3759](https://github.com/stdlib-js/stdlib/issues/3759), [#3783](https://github.com/stdlib-js/stdlib/issues/3783), [#3789](https://github.com/stdlib-js/stdlib/issues/3789), [#3797](https://github.com/stdlib-js/stdlib/issues/3797), [#3798](https://github.com/stdlib-js/stdlib/issues/3798), [#3799](https://github.com/stdlib-js/stdlib/issues/3799), [#3801](https://github.com/stdlib-js/stdlib/issues/3801), [#3803](https://github.com/stdlib-js/stdlib/issues/3803), [#3806](https://github.com/stdlib-js/stdlib/issues/3806), [#3807](https://github.com/stdlib-js/stdlib/issues/3807), [#3811](https://github.com/stdlib-js/stdlib/issues/3811), [#3817](https://github.com/stdlib-js/stdlib/issues/3817), [#3819](https://github.com/stdlib-js/stdlib/issues/3819), [#3826](https://github.com/stdlib-js/stdlib/issues/3826), [#3833](https://github.com/stdlib-js/stdlib/issues/3833), [#3837](https://github.com/stdlib-js/stdlib/issues/3837), [#3843](https://github.com/stdlib-js/stdlib/issues/3843), [#3865](https://github.com/stdlib-js/stdlib/issues/3865), [#3866](https://github.com/stdlib-js/stdlib/issues/3866), [#3871](https://github.com/stdlib-js/stdlib/issues/3871), [#3873](https://github.com/stdlib-js/stdlib/issues/3873), [#3874](https://github.com/stdlib-js/stdlib/issues/3874), [#3879](https://github.com/stdlib-js/stdlib/issues/3879), [#3880](https://github.com/stdlib-js/stdlib/issues/3880)
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[#1619](https://github.com/stdlib-js/stdlib/issues/1619), [#1632](https://github.com/stdlib-js/stdlib/issues/1632), [#1633](https://github.com/stdlib-js/stdlib/issues/1633), [#3236](https://github.com/stdlib-js/stdlib/issues/3236), [#3237](https://github.com/stdlib-js/stdlib/issues/3237), [#3238](https://github.com/stdlib-js/stdlib/issues/3238), [#3378](https://github.com/stdlib-js/stdlib/issues/3378), [#3384](https://github.com/stdlib-js/stdlib/issues/3384), [#3385](https://github.com/stdlib-js/stdlib/issues/3385), [#3401](https://github.com/stdlib-js/stdlib/issues/3401), [#3402](https://github.com/stdlib-js/stdlib/issues/3402), [#3410](https://github.com/stdlib-js/stdlib/issues/3410), [#3414](https://github.com/stdlib-js/stdlib/issues/3414), [#3417](https://github.com/stdlib-js/stdlib/issues/3417), [#3421](https://github.com/stdlib-js/stdlib/issues/3421), [#3431](https://github.com/stdlib-js/stdlib/issues/3431), [#3434](https://github.com/stdlib-js/stdlib/issues/3434), [#3435](https://github.com/stdlib-js/stdlib/issues/3435), [#3436](https://github.com/stdlib-js/stdlib/issues/3436), [#3438](https://github.com/stdlib-js/stdlib/issues/3438), [#3445](https://github.com/stdlib-js/stdlib/issues/3445), [#3446](https://github.com/stdlib-js/stdlib/issues/3446), [#3447](https://github.com/stdlib-js/stdlib/issues/3447), [#3480](https://github.com/stdlib-js/stdlib/issues/3480), [#3494](https://github.com/stdlib-js/stdlib/issues/3494), [#3501](https://github.com/stdlib-js/stdlib/issues/3501), [#3510](https://github.com/stdlib-js/stdlib/issues/3510), [#3548](https://github.com/stdlib-js/stdlib/issues/3548), [#3582](https://github.com/stdlib-js/stdlib/issues/3582), [#3585](https://github.com/stdlib-js/stdlib/issues/3585), [#3588](https://github.com/stdlib-js/stdlib/issues/3588), [#3591](https://github.com/stdlib-js/stdlib/issues/3591), [#3592](https://github.com/stdlib-js/stdlib/issues/3592), [#3595](https://github.com/stdlib-js/stdlib/issues/3595), [#3596](https://github.com/stdlib-js/stdlib/issues/3596), [#3597](https://github.com/stdlib-js/stdlib/issues/3597), [#3598](https://github.com/stdlib-js/stdlib/issues/3598), [#3601](https://github.com/stdlib-js/stdlib/issues/3601), [#3603](https://github.com/stdlib-js/stdlib/issues/3603), [#3656](https://github.com/stdlib-js/stdlib/issues/3656), [#3671](https://github.com/stdlib-js/stdlib/issues/3671), [#3701](https://github.com/stdlib-js/stdlib/issues/3701), [#3709](https://github.com/stdlib-js/stdlib/issues/3709), [#3721](https://github.com/stdlib-js/stdlib/issues/3721), [#3738](https://github.com/stdlib-js/stdlib/issues/3738), [#3739](https://github.com/stdlib-js/stdlib/issues/3739), [#3741](https://github.com/stdlib-js/stdlib/issues/3741), [#3744](https://github.com/stdlib-js/stdlib/issues/3744), [#3746](https://github.com/stdlib-js/stdlib/issues/3746), [#3759](https://github.com/stdlib-js/stdlib/issues/3759), [#3783](https://github.com/stdlib-js/stdlib/issues/3783), [#3789](https://github.com/stdlib-js/stdlib/issues/3789), [#3797](https://github.com/stdlib-js/stdlib/issues/3797), [#3798](https://github.com/stdlib-js/stdlib/issues/3798), [#3799](https://github.com/stdlib-js/stdlib/issues/3799), [#3801](https://github.com/stdlib-js/stdlib/issues/3801), [#3803](https://github.com/stdlib-js/stdlib/issues/3803), [#3806](https://github.com/stdlib-js/stdlib/issues/3806), [#3807](https://github.com/stdlib-js/stdlib/issues/3807), [#3811](https://github.com/stdlib-js/stdlib/issues/3811), [#3817](https://github.com/stdlib-js/stdlib/issues/3817), [#3819](https://github.com/stdlib-js/stdlib/issues/3819), [#3826](https://github.com/stdlib-js/stdlib/issues/3826), [#3833](https://github.com/stdlib-js/stdlib/issues/3833), [#3837](https://github.com/stdlib-js/stdlib/issues/3837), [#3843](https://github.com/stdlib-js/stdlib/issues/3843), [#3865](https://github.com/stdlib-js/stdlib/issues/3865), [#3866](https://github.com/stdlib-js/stdlib/issues/3866), [#3871](https://github.com/stdlib-js/stdlib/issues/3871), [#3873](https://github.com/stdlib-js/stdlib/issues/3873), [#3874](https://github.com/stdlib-js/stdlib/issues/3874), [#3879](https://github.com/stdlib-js/stdlib/issues/3879), [#3880](https://github.com/stdlib-js/stdlib/issues/3880)
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</section>
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<details>
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- [`9c225d9`](https://github.com/stdlib-js/stdlib/commit/9c225d9d649ffd725037384783d67f9dddee87a4) - **feat:** add C implementation for `stats/base/dists/f/skewness` [(#4041)](https://github.com/stdlib-js/stdlib/pull/4041) _(by Vivek maurya, Philipp Burckhardt)_
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- [`0cab817`](https://github.com/stdlib-js/stdlib/commit/0cab817744fa607bd863eadf32204b36e668d31c) - **feat:** add C implementation for `stats/base/dists/f/variance` [(#4042)](https://github.com/stdlib-js/stdlib/pull/4042) _(by Vivek maurya, Philipp Burckhardt)_
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- [`724d581`](https://github.com/stdlib-js/stdlib/commit/724d58131a5f47d333a0f062e56d489ce1605aa6) - **feat:** add C implementation for `stats/base/dists/exponential/mean` [(#4046)](https://github.com/stdlib-js/stdlib/pull/4046) _(by Prashant Kumar Yadav)_
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- [`ed04d90`](https://github.com/stdlib-js/stdlib/commit/ed04d90cd3540e5a3b0b5cb49f623c62935edd1e) - **feat:** add C implementation for `stats/base/dists/rayleigh/mode` [(#4024)](https://github.com/stdlib-js/stdlib/pull/4024) _(by Prashant Kumar Yadav)_

‎base/dists/f/skewness/README.md‎

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<!-- /.examples -->
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<!-- C interface documentation. -->
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* * *
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<section class="c">
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## C APIs
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- C usage documentation. -->
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<section class="usage">
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### Usage
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```c
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#include "stdlib/stats/base/dists/f/skewness.h"
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```
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#### stdlib_base_dists_f_skewness( d1, d2 )
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Evaluates the [skewness][skewness] of a [F][f-distribution] distribution with parameters `d1` (numerator degrees of freedom) and `d2` (denominator degrees of freedom).
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```c
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double out = stdlib_base_dists_f_skewness( 3.0, 7.0 );
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// returns 11.0
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```
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The function accepts the following arguments:
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- **d1**: `[in] double` numerator degrees of freedom.
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- **d2**: `[in] double` denominator degrees of freedom.
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```c
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double stdlib_base_dists_f_skewness( const double d1, const double d2 );
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```
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</section>
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<!-- /.usage -->
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<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- C API usage examples. -->
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<section class="examples">
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### Examples
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```c
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#include "stdlib/stats/base/dists/f/skewness.h"
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#include "stdlib/constants/float64/eps.h"
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#include <stdlib.h>
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#include <stdio.h>
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static double random_uniform( const double min, const double max ) {
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double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
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return min + ( v*(max-min) );
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}
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int main( void ) {
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double d1;
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double d2;
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double y;
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int i;
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for ( i = 0; i < 25; i++ ) {
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d1 = random_uniform( 0.0, 10.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
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d2 = random_uniform( 0.0, 20.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
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y = stdlib_base_dists_f_skewness( d1, d2 );
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printf( "d1: %lf, d2: %lf, skew(X;d1,d2): %lf\n", d1, d2, y );
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}
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}
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.c -->
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<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="references">

‎base/dists/f/skewness/benchmark/benchmark.js‎

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var bench = require( '@stdlib/bench' );
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var randu = require( '@stdlib/random/base/randu' );
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var Float64Array = require( '@stdlib/array/float64' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var EPS = require( '@stdlib/constants/float64/eps' );
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var pkg = require( './../package.json' ).name;
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// MAIN //
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bench( pkg, function benchmark( b ) {
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var len;
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var d1;
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var d2;
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var y;
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var i;
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len = 100;
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d1 = new Float64Array( len );
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d2 = new Float64Array( len );
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for ( i = 0; i < len; i++ ) {
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d1[ i ] = ( randu() * 10.0 ) + EPS;
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d2[ i ] = ( randu() * 10.0 ) + 6.0 + EPS;
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}
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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d1 = ( randu()*10.0 ) + EPS;
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d2 = ( randu()*10.0 ) + 6.0 + EPS;
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y = skewness( d1, d2 );
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y = skewness( d1[ i % len ], d2[ i % len ] );
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if ( isnan( y ) ) {
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b.fail( 'should not return NaN' );
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}

‎base/dists/f/skewness/benchmark/benchmark.native.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var resolve = require( 'path' ).resolve;
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var bench = require( '@stdlib/bench' );
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var Float64Array = require( '@stdlib/array/float64' );
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var randu = require( '@stdlib/random/base/randu' );
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var isnan = require( '@stdlib/math/base/assert/is-nan' );
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var EPS = require( '@stdlib/constants/float64/eps' );
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var tryRequire = require( '@stdlib/utils/try-require' );
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var pkg = require( './../package.json' ).name;
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// VARIABLES //
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var skewness = tryRequire( resolve( __dirname, './../lib/native.js' ) );
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var opts = {
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'skip': ( skewness instanceof Error )
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};
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// MAIN //
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bench( pkg+'::native', opts, function benchmark( b ) {
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var len;
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var d1;
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var d2;
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var y;
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var i;
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len = 100;
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d1 = new Float64Array( len );
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d2 = new Float64Array( len );
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for ( i = 0; i < len; i++ ) {
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d1[ i ] = ( randu() * 10.0 ) + EPS;
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d2[ i ] = ( randu() * 10.0 ) + 6.0 + EPS;
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}
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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y = skewness( d1[ i % len ], d2[ i % len ] );
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if ( isnan( y ) ) {
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b.fail( 'should not return NaN' );
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}
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}
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b.toc();
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if ( isnan( y ) ) {
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b.fail( 'should not return NaN' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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});

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