npm package: @stdlib/math-base-special-pdiff
Description: Return the positive difference between `x` and `y`.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
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</details>

# pdiff

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Return the positive difference between `x` and `y`.

<!-- 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 -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-special-pdiff
```

</section>

<section class="usage">

## 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
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   This function is the equivalent of [`fdim`][fdim] in the C/C++ standard library.

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```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 );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### 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 );
```

</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/math/base/special/pdiff.h"
#include <stdio.h>

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 );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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<section class="references">

</section>

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<section class="related">

</section>

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<section class="main-repo" >

* * *

## 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 &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[umd]: https://github.com/umdjs/umd
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[deno-url]: https://github.com/stdlib-js/math-base-special-pdiff/tree/deno
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[fdim]: http://en.cppreference.com/w/cpp/numeric/math/fdim

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