Auto-generated commit

Author: stdlib-bot

CHANGELOG.md

@@ -714,6 +714,40 @@ This release closes the following issue:
 
 <!-- /.package -->
 
+<section class="package" id="stats-base-dists-chisquare-skewness-unreleased">
+
+#### [@stdlib/stats/base/dists/chisquare/skewness](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/chisquare/skewness)
+
+<details>
+
+<section class="features">
+
+##### Features
+
+-   [`118284b`](https://github.com/stdlib-js/stdlib/commit/118284b97293f409c1769047675bed85ddf4dd20) - add C implementation for `stats/base/dists/chisquare/skewness` [(#4005)](https://github.com/stdlib-js/stdlib/pull/4005)
+
+</section>
+
+<!-- /.features -->
+
+<section class="issues">
+
+##### Closed Issues
+
+This release closes the following issue:
+
+[#3510](https://github.com/stdlib-js/stdlib/issues/3510)
+
+</section>
+
+<!-- /.issues -->
+
+</details>
+
+</section>
+
+<!-- /.package -->
+
 <section class="package" id="stats-base-dists-gumbel-variance-unreleased">
 
 #### [@stdlib/stats/base/dists/gumbel/variance](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dists/gumbel/variance)
@@ -1590,9 +1624,9 @@ A total of 3 issues were closed in this release:
 
 ### Closed Issues
 
-A total of 48 issues were closed in this release:
+A total of 49 issues were closed in this release:
 
-[#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), [#3656](https://github.com/stdlib-js/stdlib/issues/3656), [#3671](https://github.com/stdlib-js/stdlib/issues/3671), [#3721](https://github.com/stdlib-js/stdlib/issues/3721), [#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), [#3807](https://github.com/stdlib-js/stdlib/issues/3807), [#3811](https://github.com/stdlib-js/stdlib/issues/3811), [#3833](https://github.com/stdlib-js/stdlib/issues/3833), [#3837](https://github.com/stdlib-js/stdlib/issues/3837), [#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)
+[#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), [#3656](https://github.com/stdlib-js/stdlib/issues/3656), [#3671](https://github.com/stdlib-js/stdlib/issues/3671), [#3721](https://github.com/stdlib-js/stdlib/issues/3721), [#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), [#3807](https://github.com/stdlib-js/stdlib/issues/3807), [#3811](https://github.com/stdlib-js/stdlib/issues/3811), [#3833](https://github.com/stdlib-js/stdlib/issues/3833), [#3837](https://github.com/stdlib-js/stdlib/issues/3837), [#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)
 
 </section>
 
@@ -1630,6 +1664,7 @@ A total of 15 people contributed to this release. Thank you to the following con
 
 <details>
 
+-   [`118284b`](https://github.com/stdlib-js/stdlib/commit/118284b97293f409c1769047675bed85ddf4dd20) - **feat:** add C implementation for `stats/base/dists/chisquare/skewness` [(#4005)](https://github.com/stdlib-js/stdlib/pull/4005) _(by Vivek maurya, Philipp Burckhardt)_
 -   [`7a87244`](https://github.com/stdlib-js/stdlib/commit/7a872442e344e03a69d987f0f7b89d1344d5547c) - **feat:** add C implementation for `stats/base/dists/chisquare/entropy` [(#4007)](https://github.com/stdlib-js/stdlib/pull/4007) _(by Vivek maurya, Philipp Burckhardt)_
 -   [`7550aab`](https://github.com/stdlib-js/stdlib/commit/7550aabe1fa42666821032ad60b42437ee7e304e) - **feat:** add C implementation for `stats/base/dists/normal/stdev` [(#4003)](https://github.com/stdlib-js/stdlib/pull/4003) _(by Manvith M, Philipp Burckhardt)_
 -   [`8bf8285`](https://github.com/stdlib-js/stdlib/commit/8bf8285aba0ecbd00ae145c4c5c098cd28135814) - **chore:** minor clean-up _(by Philipp Burckhardt)_

base/dists/chisquare/skewness/README.md

@@ -116,6 +116,98 @@ for ( i = 0; i < 10; i++ ) {
 
 <!-- /.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/stats/base/dists/chisquare/skewness.h"
+```
+
+#### stdlib_base_dists_chisquare_skewness( k )
+
+Evaluates the [skewness][skewness] of a [chi-squared][chisquare-distribution] distribution with degrees of freedom `k`.
+
+```c
+double out = stdlib_base_dists_chisquare_skewness( 9.0 );
+// returns ~0.943
+```
+
+The function accepts the following arguments:
+
+-   **k**: `[in] double` degrees of freedom.
+
+```c
+double stdlib_base_dists_chisquare_skewness( const double k );
+```
+
+</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/stats/base/dists/chisquare/skewness.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+static double random_uniform( const double min, const double max ) {
+    double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+    return min + ( v*(max-min) );
+}
+
+int main( void ) {
+    double k;
+    double y;
+    int i;
+
+    for ( i = 0; i < 25; i++ ) {
+        k = random_uniform( 0.0, 20.0 );
+        y = stdlib_base_dists_chisquare_skewness( k );
+        printf( "k: %lf, skew(X,k): %lf\n", k, y );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- 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. -->
 
 <section class="references">

base/dists/chisquare/skewness/benchmark/benchmark.js

@@ -22,6 +22,7 @@
 
 var bench = require( '@stdlib/bench' );
 var randu = require( '@stdlib/random/base/randu' );
+var Float64Array = require( '@stdlib/array/float64' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var pkg = require( './../package.json' ).name;
@@ -31,14 +32,20 @@ var skewness = require( './../lib' );
 // MAIN //
 
 bench( pkg, function benchmark( b ) {
+	var len;
 	var k;
 	var y;
 	var i;
 
+	len = 100;
+	k = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		k[ i ] = ( randu() * 20.0 ) + EPS;
+	}
+
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		k = ( randu()*20.0 ) + EPS;
-		y = skewness( k );
+		y = skewness( k[ i % len ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

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

@@ -0,0 +1,68 @@
+/**
+* @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 Float64Array = require( '@stdlib/array/float64' );
+var EPS = require( '@stdlib/constants/float64/eps' );
+var randu = require( '@stdlib/random/base/randu' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var skewness = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( skewness instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var len;
+	var k;
+	var y;
+	var i;
+
+	len = 100;
+	k = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		k[ i ] = ( randu() * 20.0 ) + EPS;
+	}
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = skewness( k[ i % len ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});