Auto-generated commit

Author: stdlib-bot

.github/.keepalive

@@ -4,15 +4,25 @@
 
 <section class="release" id="unreleased">
 
-## Unreleased (2025-04-07)
+## Unreleased (2025-05-06)
+
+<section class="features">
+
+### Features
+
+-   [`736fe31`](https://github.com/stdlib-js/stdlib/commit/736fe3118504faef9a2b6ac064debe426c8f9a24) - add C implementation for `stats/base/dists/lognormal/skewness` [(#4166)](https://github.com/stdlib-js/stdlib/pull/4166)
+
+</section>
+
+<!-- /.features -->
 
 <section class="issues">
 
 ### Closed Issues
 
-This release closes the following issue:
+A total of 2 issues were closed in this release:
 
-[#4979](https://github.com/stdlib-js/stdlib/issues/4979)
+[#3757](https://github.com/stdlib-js/stdlib/issues/3757), [#4979](https://github.com/stdlib-js/stdlib/issues/4979)
 
 </section>
 
@@ -24,6 +34,7 @@ This release closes the following issue:
 
 <details>
 
+-   [`736fe31`](https://github.com/stdlib-js/stdlib/commit/736fe3118504faef9a2b6ac064debe426c8f9a24) - **feat:** add C implementation for `stats/base/dists/lognormal/skewness` [(#4166)](https://github.com/stdlib-js/stdlib/pull/4166) _(by Manvith M, Philipp Burckhardt, stdlib-bot)_
 -   [`ae08a29`](https://github.com/stdlib-js/stdlib/commit/ae08a29eb928357ae97532f0c3f398b0fef58ebd) - **bench:** refactor random number generation in `stats/base/dists/lognormal` [(#5164)](https://github.com/stdlib-js/stdlib/pull/5164) _(by Saurabh Singh)_
 -   [`4a70790`](https://github.com/stdlib-js/stdlib/commit/4a707903dfef7c2b56216000165706497d19a251) - **style:** add missing spaces _(by Philipp Burckhardt)_
 
@@ -37,8 +48,9 @@ This release closes the following issue:
 
 ### Contributors
 
-A total of 2 people contributed to this release. Thank you to the following contributors:
+A total of 3 people contributed to this release. Thank you to the following contributors:
 
+-   Manvith M
 -   Philipp Burckhardt
 -   Saurabh Singh
 

CHANGELOG.md

@@ -51,15 +51,18 @@ Dorrin Sotoudeh <dorrinsotoudeh123@gmail.com>
 EuniceSim142 <77243938+EuniceSim142@users.noreply.github.com>
 Frank Kovacs <fran70kk@gmail.com>
 GK Bishnoi <gkishan1kyt@gmail.com>
+GURU PRASAD SHARMA <168292003+GURUPRASADSHARMA@users.noreply.github.com>
 Gaurav <gaurav70380@gmail.com>
 Gautam sharma <gautamkrishnasharma1@gmail.com>
+Girish Garg <garggirish2020@gmail.com>
 Golden Kumar <103646877+AuenKr@users.noreply.github.com>
 Gunj Joshi <gunjjoshi8372@gmail.com>
 Gururaj Gurram <gururajgurram1512@gmail.com>
 Haroon Rasheed <51189276+haroon26@users.noreply.github.com>
-Harsh <149176984+hrshya@users.noreply.github.com>
+Harsh <harshyadav6078@gmail.com>
 HarshaNP <96897754+GittyHarsha@users.noreply.github.com>
 Harshita Kalani <harshitakalani02@gmail.com>
+Hemang Choudhary <coehemang@gmail.com>
 Hemant M Mehta <92446645+hemantmm@users.noreply.github.com>
 Hridyanshu <124202756+HRIDYANSHU054@users.noreply.github.com>
 Jaimin Godhani <112328542+Jai0401@users.noreply.github.com>
@@ -77,15 +80,18 @@ Joris Labie <joris.labie1@gmail.com>
 Justin Dennison <justin1dennison@gmail.com>
 Justyn Shelby <96994781+ShelbyJustyn@users.noreply.github.com>
 Karan Anand <anandkarancompsci@gmail.com>
+Karan Yadav <77043443+karanBRAVO@users.noreply.github.com>
 Karthik Prakash <116057817+skoriop@users.noreply.github.com>
 Kaushikgtm <162317291+Kaushikgtm@users.noreply.github.com>
 Kavyansh-Bagdi <153486713+Kavyansh-Bagdi@users.noreply.github.com>
 Kohantika Nath <145763549+kohantikanath@users.noreply.github.com>
 Krishnam Agarwal <83017176+888krishnam@users.noreply.github.com>
 Krishnendu Das <86651039+itskdhere@users.noreply.github.com>
 Kshitij-Dale <152467202+Kshitij-Dale@users.noreply.github.com>
+Lalit Narayan Yadav <162928571+LalitNarayanYadav@users.noreply.github.com>
 Lovelin Dhoni J B <100030865+lovelindhoni@users.noreply.github.com>
 MANI <77221000+Eternity0207@users.noreply.github.com>
+Mahfuza Humayra Mohona <mhmohona@gmail.com>
 Manik Sharma <maniksharma.rke@gmail.com>
 Manvith M <148960168+manvith2003@users.noreply.github.com>
 Marcus Fantham <mfantham@users.noreply.github.com>
@@ -103,6 +109,7 @@ Naveen Kumar <stupiddint@gmail.com>
 Neeraj Pathak <neerajrpathak710@gmail.com>
 NirvedMishra <139633597+NirvedMishra@users.noreply.github.com>
 Nishant Shinde <97207366+nishant-s7@users.noreply.github.com>
+Nishant singh <38534128+Nishantsingh11@users.noreply.github.com>
 Nishchay Rajput <121144841+NishchayRajput@users.noreply.github.com>
 Nithin Katta <88046362+nithinkatta@users.noreply.github.com>
 Nourhan Hasan <109472010+TheNourhan@users.noreply.github.com>
@@ -118,6 +125,7 @@ Prashant Kumar Yadav <144602492+0PrashantYadav0@users.noreply.github.com>
 PrathamBhamare <164445568+PrathamBhamare@users.noreply.github.com>
 Pratik Singh <97464067+Pratik772846@users.noreply.github.com>
 Pratyush Kumar Chouhan <pratyushkumar0308@gmail.com>
+Pravesh Kunwar <praveshkunwar04@gmail.com>
 Priyansh Prajapati <88396544+itsspriyansh@users.noreply.github.com>
 Priyanshu Agarwal <113460573+AgPriyanshu18@users.noreply.github.com>
 Pulkit Gupta <65711278+pulkitgupta2@users.noreply.github.com>
@@ -174,12 +182,15 @@ Yaswanth Kosuru <116426380+yaswanthkosuru@users.noreply.github.com>
 Yernar Yergaziyev <yernar.yergaziyev@erg.kz>
 Yugal Kaushik <yugalkaushik14@gmail.com>
 Yuvi Mittal <128018763+yuvi-mittal@users.noreply.github.com>
+devshree-bhati <147095250+devshree-bhati@users.noreply.github.com>
 ditsu <170345142+ditsus@users.noreply.github.com>
 ekambains <bainsinbusiness@gmail.com>
 fadiothman22 <48636283+fadiothman22@users.noreply.github.com>
+iraandrushko <71790513+iraandrushko@users.noreply.github.com>
 lohithganni <116790357+lohithganni@users.noreply.github.com>
 olenkabilonizhka <62379231+olenkabilonizhka@users.noreply.github.com>
 pranav-1720 <123018993+pranav-1720@users.noreply.github.com>
 rahulrangers <127782777+rahulrangers@users.noreply.github.com>
 rainn <88160429+AmCodesLame@users.noreply.github.com>
 rei2hu <reimu@reimu.ws>
+zhanggy <geodaoyu@foxmail.com>

CONTRIBUTORS

@@ -167,13 +167,100 @@ for ( i = 0; i < 10; i++ ) {
 
 <!-- /.examples -->
 
-<!-- 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. -->
+<!-- C interface documentation. -->
 
-<section class="references">
+* * *
+
+<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/lognormal/skewness.h"
+```
+
+#### stdlib_base_dists_lognormal_skewness( mu, sigma )
+
+Returns the skewness for a lognormal distribution with location `mu` and scale `sigma`.
+
+```c
+double out = stdlib_base_dists_lognormal_skewness( 0.0, 1.0 );
+// returns ~6.185
+```
+
+The function accepts the following arguments:
+
+-   **mu**: `[in] double` location parameter.
+-   **sigma**: `[in] double` scale parameter.
+
+```c
+double stdlib_base_dists_lognormal_skewness( const double mu, const double sigma );
+```
+
+</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/lognormal/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 sigma;
+    double mu;
+    double y;
+    int i;
+
+    for ( i = 0; i < 10; i++ ) {
+        mu = random_uniform( -5.0, 5.0 );
+        sigma = random_uniform( 0.1, 20.0 );
+        y = stdlib_base_dists_lognormal_skewness( mu, sigma );
+        printf("µ: %.4f, σ: %.4f, skew(X;µ,σ): %.4f\n", mu, sigma, y);
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
 
 </section>
 
-<!-- /.references -->
+<!-- /.c -->
 
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 

README.md

@@ -0,0 +1,70 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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-harness' );
+var Float64Array = require( '@stdlib/array-float64' );
+var uniform = require( '@stdlib/random-base-uniform' );
+var isnan = require( '@stdlib/math-base-assert-is-nan' );
+var tryRequire = require( '@stdlib/utils-try-require' );
+var EPS = require( '@stdlib/constants-float64-eps' );
+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 sigma;
+	var len;
+	var mu;
+	var y;
+	var i;
+
+	len = 100;
+	mu = new Float64Array( len );
+	sigma = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		mu[ i ] = uniform( -50.0, 50.0 );
+		sigma[ i ] = uniform( EPS, 20.0 );
+	}
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = skewness( mu[ i % len ], sigma[ 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();
+});