feat: add C implementation for `math/base/special/rising-factorial` #4455

DhruvArvindSingh · 2025-01-02T09:39:17Z

Progresses #649 .

Description

What is the purpose of this pull request?

This pull request:

adds C implementation for math/base/special/rising-factorial.

double stdlib_base_rising_factorial( const double x, const int32_t n )

Related Issues

Does this pull request have any related issues?

This pull request:

progresses [RFC]: Add C implementations to base special math functions (tracking issue) #649

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

Read, understood, and followed the contributing guidelines.

@stdlib-js/reviewers

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stdlib-bot · 2025-01-02T09:41:53Z

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/rising-factorial	$\color{green}229/229$ $\color{green}+100.00\%$	$\color{green}25/25$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}229/229$ $\color{green}+100.00\%$

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

--- 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: na - task: lint_typescript_tests status: na - task: lint_license_headers status: passed --- --- type: pre_push_report description: Results of running various checks prior to pushing changes. report: - task: run_javascript_examples status: na - task: run_c_examples status: na - task: run_cpp_examples status: na - task: run_javascript_readme_examples status: passed - task: run_c_benchmarks status: na - task: run_cpp_benchmarks status: na - task: run_fortran_benchmarks status: na - task: run_javascript_benchmarks status: na - task: run_julia_benchmarks status: na - task: run_python_benchmarks status: na - task: run_r_benchmarks status: na - task: run_javascript_tests status: na ---

Signed-off-by: Karan Anand <[email protected]>

anandkaranubc · 2025-05-11T07:52:23Z

/stdlib merge

anandkaranubc · 2025-05-11T07:57:52Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+*
+* ## Notice
+*
+* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified according to project conventions.


Suggested change

* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified according to project conventions.

* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified according to stdlib conventions.

anandkaranubc · 2025-05-11T08:08:32Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+	double xc;
+	bool inv;
+
+	if ( stdlib_base_is_nan( x ) || !stdlib_base_is_integer( n ) ) {


Suggested change

if ( stdlib_base_is_nan( x ) || !stdlib_base_is_integer( n ) ) {

if ( stdlib_base_is_nan( x ) ) {

n is already and integer.

anandkaranubc · 2025-05-11T08:09:20Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+#include "stdlib/math/base/assert/is_integer.h"
+#include "stdlib/math/base/assert/is_nan.h"
+#include "stdlib/math/base/special/gamma_delta_ratio.h"
+#include "stdlib/math/base/special/falling_factorial.h"


Suggested change

#include "stdlib/math/base/special/falling_factorial.h"

#include <stdint.h>

anandkaranubc · 2025-05-11T08:09:56Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+#include "stdlib/math/base/assert/is_integer.h"
+#include "stdlib/math/base/assert/is_nan.h"
+#include "stdlib/math/base/special/gamma_delta_ratio.h"
+#include "stdlib/math/base/special/falling_factorial.h"


Suggested change

#include "stdlib/math/base/special/falling_factorial.h"

#include <stdbool.h>

anandkaranubc · 2025-05-11T08:12:33Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+	nc = n;
+	xc = x;
+	inv = false;
+	if ( xc < 0.0 ) {


Suggested change

if ( xc < 0.0 ) {

// For `x < 0`, we really have a falling factorial, modulo a possible change of sign. Note that the falling factorial isn't defined for negative `n`, so we'll get rid of that case first:

anandkaranubc · 2025-05-11T08:13:37Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+			nc = -nc;
+			inv = true;
+		}
+		result = ( ( nc & 1 ) ? -1.0 : 1.0 ) * stdlib_base_falling_factorial( -xc, nc );


Suggested change

result = ( ( nc & 1 ) ? -1.0 : 1.0 ) * stdlib_base_falling_factorial( -xc, nc );

result = ( (nc&1) ? -1.0 : 1.0 ) * stdlib_base_falling_factorial( -xc, nc );

Following the same negative spacing in main.js

anandkaranubc · 2025-05-11T08:14:16Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+	xc = x;
+	inv = false;
+	if ( xc < 0.0 ) {
+		if ( nc < 0.0 ) {


Suggested change

if ( nc < 0.0 ) {

if ( nc < 0 ) {

nc is int32_t

anandkaranubc · 2025-05-11T08:15:11Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+		}
+		return 0.0;
+	}
+	if ( ( xc < 1.0 ) && ( xc + nc < 0.0 ) ) {


Suggested change

if ( ( xc < 1.0 ) && ( xc + nc < 0.0 ) ) {

if ( ( xc < 1.0 ) && ( xc+nc < 0.0 ) ) {

anandkaranubc · 2025-05-11T08:15:40Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

+	}
+	if ( ( xc < 1.0 ) && ( xc + nc < 0.0 ) ) {
+		result = stdlib_base_gamma_delta_ratio( 1.0 - xc, -nc );
+		return ( nc & 1 ) ? -result : result;


Suggested change

return ( nc & 1 ) ? -result : result;

return ( nc&1 ) ? -result : result;

anandkaranubc · 2025-05-11T08:19:14Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/src/addon.c

+#include "stdlib/math/base/special/rising_factorial.h"
+#include "stdlib/math/base/napi/binary.h"
+
+// cppcheck-suppress shadowFunction


Suggested change

// cppcheck-suppress shadowFunction

anandkaranubc · 2025-05-11T08:21:54Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/lib/native.js

+*
+*
+* ## Notice
+*
+* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified for JavaScript.
+*
+* ```text
+* (C) Copyright John Maddock 2006, 2010.
+*
+* Use, modification and distribution are subject to the
+* Boost Software License, Version 1.0. (See accompanying file
+* LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
+* ```
+*/


Suggested change

*

*

* ## Notice

*

* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified for JavaScript.

*

* ```text

* (C) Copyright John Maddock 2006, 2010.

*

* Use, modification and distribution are subject to the

* Boost Software License, Version 1.0. (See accompanying file

* LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)

* ```

*/

This is not needed in native.js as there isn't anything derived from the Boost library.

anandkaranubc · 2025-05-11T08:23:14Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/lib/native.js

+*
+* ## Notes
+*
+* -   The rising factorial is defined as
+*
+*     ```tex
+*     \operatorname{risingFactorial}(x, n) = x (x-1) (x-2) (x-3) \ldots (x-n+1)
+*     ```
+*
+*     or equivalently
+*
+*     ```tex
+*     \operatorname{risingFactorial}(x, n) = \frac{ \Gamma(x + n) }{ \Gamma(x) };
+*     ```
+*


Suggested change

*

* ## Notes

*

* - The rising factorial is defined as

*

* ```tex

* \operatorname{risingFactorial}(x, n) = x (x-1) (x-2) (x-3) \ldots (x-n+1)

* ```

*

* or equivalently

*

* ```tex

* \operatorname{risingFactorial}(x, n) = \frac{ \Gamma(x + n) }{ \Gamma(x) };

* ```

*

anandkaranubc · 2025-05-11T08:23:38Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/lib/native.js

+*     ```tex
+*     \operatorname{risingFactorial}(x, n) = \frac{ \Gamma(x + n) }{ \Gamma(x) };
+*     ```
+*


Suggested change

*

* @private

anandkaranubc · 2025-05-11T08:25:04Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/manifest.json

+      "libraries": [],
+      "libpath": [],
+      "dependencies": [
+        "@stdlib/math/base/assert/is-integer",


Suggested change

"@stdlib/math/base/assert/is-integer",

anandkaranubc · 2025-05-11T08:30:11Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/c/native/benchmark.c

+
+	t = tic();
+	for ( i = 0; i < ITERATIONS; i++ ) {
+		y = stdlib_base_rising_factorial( x[ i % 100 ], n[ i % 100 ] );


Suggested change

y = stdlib_base_rising_factorial( x[ i % 100 ], n[ i % 100 ] );

y = stdlib_base_rising_factorial( x[ i%100 ], n[ i%100 ] );

anandkaranubc · 2025-05-11T08:30:39Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/c/native/benchmark.c

+
+	for ( i = 0; i < 100; i++ ) {
+		x[ i ] = ( 40.0 * rand_double() ) + 1.0;
+		n[ i ] = (int32_t)( 41.0 * rand_double() );


Suggested change

n[ i ] = (int32_t)( 41.0 * rand_double() );

x[ i ] = ( 100.0*rand_double() ) - 50.0;

Using similar values used in cpp benchmarks, for consistency.

anandkaranubc · 2025-05-11T08:30:57Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/c/native/benchmark.c

+
+	for ( i = 0; i < 100; i++ ) {
+		x[ i ] = ( 40.0 * rand_double() ) + 1.0;
+		n[ i ] = (int32_t)( 41.0 * rand_double() );


Suggested change

n[ i ] = (int32_t)( 41.0 * rand_double() );

n[ i ] = (int32_t)( 50.0*rand_double() );

Same comment.

anandkaranubc · 2025-05-11T08:32:18Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/benchmark.native.js

+
+// MAIN //
+
+bench( pkg, opts, function benchmark( b ) {


Suggested change

bench( pkg, opts, function benchmark( b ) {

bench( pkg+'::native', opts, function benchmark( b ) {

anandkaranubc · 2025-05-11T08:33:00Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/benchmark.native.js

+	var i;
+
+	x = randu( 100, 1.0, 41.0 );
+	n = discreteUniform( 100, 0, 40 );


Suggested change

n = discreteUniform( 100, 0, 40 );

x = uniform( 100, -50.0, 50.0 );

anandkaranubc · 2025-05-11T08:33:08Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/benchmark.native.js

+	var i;
+
+	x = randu( 100, 1.0, 41.0 );
+	n = discreteUniform( 100, 0, 40 );


Suggested change

n = discreteUniform( 100, 0, 40 );

n = discreteUniform( 100, -50, 50 );

anandkaranubc · 2025-05-11T08:33:16Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/benchmark.native.js

+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = risingFactorial( x[ i % x.length ], n[ i % n.length ] );


Suggested change

y = risingFactorial( x[ i % x.length ], n[ i % n.length ] );

y = risingFactorial( x[ i%x.length ], n[ i%n.length ] );

anandkaranubc · 2025-05-11T08:35:07Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/examples/c/example.c

+	int i;
+	for ( i = 0; i < 10; i++ ) {
+		v = stdlib_base_rising_factorial( x[ i ], n[ i ] );
+		printf( "x: %lf, n: %d, rising_factorial(x,n): %lf\n", x[ i ], n[ i ], v );


Suggested change

printf( "x: %lf, n: %d, rising_factorial(x,n): %lf\n", x[ i ], n[ i ], v );

printf( "risingFactorial(%lf, %d) = %lf\n", x[ i ], n[ i ], v );

Following the JS equivalent example file.

anandkaranubc · 2025-05-11T08:35:37Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/benchmark/c/native/benchmark.c

+*/
+
+#include "stdlib/math/base/special/rising_factorial.h"
+#include <stdlib.h>


Suggested change

#include <stdlib.h>

#include <stdint.h>

anandkaranubc · 2025-05-11T08:40:28Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/examples/index.js

This file needs to be revisited using logEachMap

anandkaranubc · 2025-05-11T08:44:57Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/test/test.native.js

+
+tape( 'the function returns `1` if provided `n = 0` and a nonnegative `x`', opts, function test( t ) {
+	var val = risingFactorial( 2.0, 0 );
+	t.equal( val, 1.0, 'returns expected value' );


Suggested change

t.equal( val, 1.0, 'returns expected value' );

t.strictEqual( val, 1.0, 'returns expected value' );

Applies here and elsewhere.

anandkaranubc · 2025-05-11T08:46:37Z

lib/node_modules/@stdlib/math/base/special/rising-factorial/README.md

+
+#### stdlib_base_rising_factorial( x, n )
+
+Evaluates the rising factorial of `x` and `n`.


Suggested change

Evaluates the rising factorial of `x` and `n`.

Evaluates the [rising factorial][falling-and-rising-factorials] of `x` and `n`.

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lib/node_modules/@stdlib/math/base/special/rising-factorial/src/main.c

Signed-off-by: Philipp Burckhardt <[email protected]>

stdlib-bot added Math Issue or pull request specific to math functionality. Needs Review A pull request which needs code review. labels Jan 2, 2025

DhruvArvindSingh changed the title ~~feat: add C implementation for math/base/special/rising-factorial~~ feat: add C implementation for math/base/special/rising-factorial Jan 2, 2025

DhruvArvindSingh mentioned this pull request Apr 7, 2025

[RFC]: Add support for string arrays in stdlib stdlib-js/google-summer-of-code#144

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anandkaranubc self-requested a review May 11, 2025 07:50

Merge branch 'develop' into feat/rising-factorial_develop

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Signed-off-by: Karan Anand <[email protected]>

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feat: add C implementation for `math/base/special/rising-factorial` #4455

feat: add C implementation for `math/base/special/rising-factorial` #4455

DhruvArvindSingh commented Jan 2, 2025

stdlib-bot commented Jan 2, 2025 •

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	* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified according to project conventions.
	* The original C++ code and copyright notice are from the [Boost library]{@link http://www.boost.org/doc/libs/1_64_0/boost/math/special_functions/factorials.hpp}. The implementation has been modified according to stdlib conventions.

	if ( stdlib_base_is_nan( x ) \|\| !stdlib_base_is_integer( n ) ) {
	if ( stdlib_base_is_nan( x ) ) {

	#include "stdlib/math/base/special/falling_factorial.h"
	#include <stdint.h>

	#include "stdlib/math/base/special/falling_factorial.h"
	#include <stdbool.h>

	if ( xc < 0.0 ) {
	// For `x < 0`, we really have a falling factorial, modulo a possible change of sign. Note that the falling factorial isn't defined for negative `n`, so we'll get rid of that case first:

	result = ( ( nc & 1 ) ? -1.0 : 1.0 ) * stdlib_base_falling_factorial( -xc, nc );
	result = ( (nc&1) ? -1.0 : 1.0 ) * stdlib_base_falling_factorial( -xc, nc );

	if ( ( xc < 1.0 ) && ( xc + nc < 0.0 ) ) {
	if ( ( xc < 1.0 ) && ( xc+nc < 0.0 ) ) {

	return ( nc & 1 ) ? -result : result;
	return ( nc&1 ) ? -result : result;

	y = stdlib_base_rising_factorial( x[ i % 100 ], n[ i % 100 ] );
	y = stdlib_base_rising_factorial( x[ i%100 ], n[ i%100 ] );

	n[ i ] = (int32_t)( 41.0 * rand_double() );
	x[ i ] = ( 100.0*rand_double() ) - 50.0;

	n[ i ] = (int32_t)( 41.0 * rand_double() );
	n[ i ] = (int32_t)( 50.0*rand_double() );

	bench( pkg, opts, function benchmark( b ) {
	bench( pkg+'::native', opts, function benchmark( b ) {

	n = discreteUniform( 100, 0, 40 );
	x = uniform( 100, -50.0, 50.0 );

	n = discreteUniform( 100, 0, 40 );
	n = discreteUniform( 100, -50, 50 );

	y = risingFactorial( x[ i % x.length ], n[ i % n.length ] );
	y = risingFactorial( x[ i%x.length ], n[ i%n.length ] );

	printf( "x: %lf, n: %d, rising_factorial(x,n): %lf\n", x[ i ], n[ i ], v );
	printf( "risingFactorial(%lf, %d) = %lf\n", x[ i ], n[ i ], v );

	t.equal( val, 1.0, 'returns expected value' );
	t.strictEqual( val, 1.0, 'returns expected value' );


		#### stdlib_base_rising_factorial( x, n )

		Evaluates the rising factorial of `x` and `n`.

	Evaluates the rising factorial of `x` and `n`.
	Evaluates the [rising factorial][falling-and-rising-factorials] of `x` and `n`.

feat: add C implementation for math/base/special/rising-factorial #4455

feat: add C implementation for math/base/special/rising-factorial #4455

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DhruvArvindSingh commented Jan 2, 2025

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feat: add C implementation for `math/base/special/rising-factorial` #4455

feat: add C implementation for `math/base/special/rising-factorial` #4455

stdlib-bot commented Jan 2, 2025 •

edited

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