https://github.com/stdlib-js/math-base-special-pdiff
Return the positive difference between `x` and `y`.
https://github.com/stdlib-js/math-base-special-pdiff
dbl diff difference dim double double-precision fdim javascript math mathematics node node-js nodejs pos positive stdlib
Last synced: 4 days ago
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Return the positive difference between `x` and `y`.
- Host: GitHub
- URL: https://github.com/stdlib-js/math-base-special-pdiff
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-14T16:37:22.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2025-03-31T00:40:20.000Z (about 2 months ago)
- Last Synced: 2025-05-14T15:48:38.506Z (6 days ago)
- Topics: dbl, diff, difference, dim, double, double-precision, fdim, javascript, math, mathematics, node, node-js, nodejs, pos, positive, stdlib
- Language: Python
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 420 KB
- Stars: 2
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
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# pdiff
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Return the positive difference between `x` and `y`.
## Installation
```bash
npm install @stdlib/math-base-special-pdiff
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var pdiff = require( '@stdlib/math-base-special-pdiff' );
```
#### pdiff( x, y )
Returns the positive difference between `x` and `y` if `x < y`; otherwise, returns `0`.
```javascript
var v = pdiff( 4.2, 3.14 );
// returns 1.06
v = pdiff( 3.14, 4.2 );
// returns +0.0
v = pdiff( -0.0, +0.0 );
// returns +0.0
```
If any argument is `NaN`, the function returns `NaN`.
```javascript
var v = pdiff( 4.2, NaN );
// returns NaN
v = pdiff( NaN, 3.14 );
// returns NaN
v = pdiff( NaN, NaN );
// returns NaN
```
## Notes
- This function is the equivalent of [`fdim`][fdim] in the C/C++ standard library.
## Examples
```javascript
var minstd = require( '@stdlib/random-base-minstd-shuffle' );
var pdiff = require( '@stdlib/math-base-special-pdiff' );
var x;
var y;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = minstd();
y = minstd();
v = pdiff( x, y );
console.log( 'pdiff(%d,%d) = %d', x, y, v );
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/math/base/special/pdiff.h
```
#### stdlib_base_pdiff( x, y )
Returns the positive difference between `x` and `y`.
```c
double v = stdlib_base_pdiff( 4.0, 3.0 );
// returns 1.0
```
The function accepts the following arguments:
- **x**: `[in] double` input value.
- **y**: `[in] double` input value.
```c
double stdlib_base_pdiff( const double x, const double y );
```
### Examples
```c
#include "stdlib/math/base/special/pdiff.h"
#include
int main( void ) {
const double x[] = { 3.0, 4.0, 6.0, 5.0 };
double y;
int i;
for ( i = 0; i < 4; i += 2 ) {
y = stdlib_base_pdiff( x[ i ], x[ i+1 ] );
printf( "pdiff(%lf, %lf) = %lf\n", x[ i ], x[ i+1 ], y );
}
}
```
* * *
## Notice
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/math-base-special-pdiff.svg
[npm-url]: https://npmjs.org/package/@stdlib/math-base-special-pdiff
[test-image]: https://github.com/stdlib-js/math-base-special-pdiff/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/math-base-special-pdiff/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-special-pdiff/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-pdiff?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/math-base-special-pdiff/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-pdiff/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-pdiff/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-pdiff/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-pdiff/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-pdiff/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-pdiff/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-special-pdiff/main/LICENSE
[fdim]: http://en.cppreference.com/w/cpp/numeric/math/fdim