feat: add `stats/base/ndarray/svariancech` by DivyanshuVortex · Pull Request #9683 · stdlib-js/stdlib

DivyanshuVortex · 2026-01-10T18:20:35Z

Resolves : none.

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feat: add stats/base/ndarray/svariancech

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--- type: pre_commit_static_analysis_report description: Results of running static analysis checks when committing changes. report: - task: lint_filenames status: passed - task: lint_editorconfig status: passed - task: lint_markdown status: passed - task: lint_package_json status: na - task: lint_repl_help status: na - task: lint_javascript_src status: na - task: lint_javascript_cli status: na - task: lint_javascript_examples status: na - task: lint_javascript_tests status: na - task: lint_javascript_benchmarks status: na - task: lint_python status: na - task: lint_r status: na - task: lint_c_src status: na - task: lint_c_examples status: na - task: lint_c_benchmarks status: na - task: lint_c_tests_fixtures status: na - task: lint_shell status: na - task: lint_typescript_declarations status: passed - task: lint_typescript_tests status: na - task: lint_license_headers status: passed ---

stdlib-bot · 2026-01-10T18:22:47Z

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/ndarray/svariancech	$\color{green}124/124$ $\color{green}+0.00%$	$\color{green}3/3$ $\color{green}+0.00%$	$\color{green}1/1$ $\color{green}+0.00%$	$\color{green}124/124$ $\color{green}+0.00%$

The above coverage report was generated for the changes in this PR.

Signed-off-by: Divyanshu <divyanshuchandra9027@gmail.com>

Planeshifter · 2026-01-13T06:23:31Z

+* var v = variancech( [ x, correction ] );
+* // returns 6.25
+*/
+function variancech( arrays ) {


The function name should be svariancech (not variancech) to match the package name and follow the stdlib naming convention for single-precision functions.

Planeshifter · 2026-01-13T06:23:32Z

+*
+* var correction = scalar2ndarray( 1.0, opts );
+*
+* var v = variancech( [ x, correction ] );


The JSDoc example also uses variancech but should use svariancech to match the function name.

Suggested change

* var v = variancech( [ x, correction ] );

* var v = svariancech( [ x, correction ] );

Planeshifter · 2026-01-13T06:23:33Z

+
+// EXPORTS //
+
+module.exports = variancech;


The export should also be updated to match the renamed function.

Suggested change

module.exports = variancech;

module.exports = svariancech;

Planeshifter · 2026-01-13T06:23:34Z

+
+/// <reference types="@stdlib/types"/>
+
+import { typedndarray } from '@stdlib/types/ndarray';


For single-precision packages, we should also import float32ndarray to use in the function signature. Looking at sstdevch, it imports both types.

Suggested change

import { typedndarray } from '@stdlib/types/ndarray';

import { float32ndarray, typedndarray } from '@stdlib/types/ndarray';

Planeshifter · 2026-01-13T06:23:35Z

+* var v = svariancech( [ x, correction ] );
+* // returns ~4.3333
+*/
+declare function svariancech<T extends typedndarray<number> = typedndarray<number>>( arrays: [ T, T ] ): number;


The first parameter should be float32ndarray (not generic T) to ensure type safety for this single-precision function. Looking at sstdevch, it uses [ float32ndarray, T ].

Suggested change

declare function svariancech<T extends typedndarray<number> = typedndarray<number>>( arrays: [ T, T ] ): number;

declare function svariancech<T extends typedndarray<number> = typedndarray<number>>( arrays: [ float32ndarray, T ] ): number;

--- type: pre_commit_static_analysis_report description: Results of running static analysis checks when committing changes. report: - task: lint_filenames status: passed - task: lint_editorconfig status: passed - task: lint_markdown status: na - task: lint_package_json status: na - task: lint_repl_help status: na - task: lint_javascript_src status: passed - task: lint_javascript_cli status: na - task: lint_javascript_examples status: na - task: lint_javascript_tests status: na - task: lint_javascript_benchmarks status: na - task: lint_python status: na - task: lint_r status: na - task: lint_c_src status: na - task: lint_c_examples status: na - task: lint_c_benchmarks status: na - task: lint_c_tests_fixtures status: na - task: lint_shell status: na - task: lint_typescript_declarations status: passed - task: lint_typescript_tests status: passed - task: lint_license_headers status: passed ---

DivyanshuVortex added 2 commits January 10, 2026 18:15

stdlib-bot added Statistics Issue or pull request related to statistical functionality. Needs Review A pull request which needs code review. labels Jan 10, 2026

DivyanshuVortex added 2 commits January 11, 2026 00:08

Update main.js

926df79

Signed-off-by: Divyanshu <divyanshuchandra9027@gmail.com>

chores

5404a5c

Planeshifter self-requested a review January 13, 2026 06:03

Planeshifter requested changes Jan 13, 2026

View reviewed changes

DivyanshuVortex requested a review from Planeshifter January 13, 2026 08:28

DivyanshuVortex closed this Jan 19, 2026

stdlib-bot removed the Needs Review A pull request which needs code review. label Jan 19, 2026

DivyanshuVortex deleted the svariancech branch January 19, 2026 07:40

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feat: add `stats/base/ndarray/svariancech`#9683

feat: add `stats/base/ndarray/svariancech`#9683
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DivyanshuVortex:svariancech

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	* var v = variancech( [ x, correction ] );
	* var v = svariancech( [ x, correction ] );


		/// <reference types="@stdlib/types"/>

		import { typedndarray } from '@stdlib/types/ndarray';

	import { typedndarray } from '@stdlib/types/ndarray';
	import { float32ndarray, typedndarray } from '@stdlib/types/ndarray';

	declare function svariancech<T extends typedndarray<number> = typedndarray<number>>( arrays: [ T, T ] ): number;
	declare function svariancech<T extends typedndarray<number> = typedndarray<number>>( arrays: [ float32ndarray, T ] ): number;

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DivyanshuVortex commented Jan 10, 2026

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