time-to-botec/squiggle/node_modules/@stdlib/math/base/special/pdifff/README.md

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# pdifff

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

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## Usage

```javascript
var pdifff = require( '@stdlib/math/base/special/pdifff' );
```

#### pdifff( x, y )

Returns the positive difference between `x` and `y` if `x < y`; otherwise, returns `0`.

```javascript
var v = pdifff( 4.15, 3.15 );
// returns 1.0

v = pdifff( 3.14, 4.2 );
// returns +0.0

v = pdifff( -0.0, +0.0 );
// returns +0.0
```

If any argument is `NaN`, the function returns `NaN`.

```javascript
var v = pdifff( 4.2, NaN );
// returns NaN

v = pdifff( NaN, 3.14 );
// returns NaN

v = pdifff( NaN, NaN );
// returns NaN
```

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## Notes

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

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## Examples

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

```javascript
var minstd = require( '@stdlib/random/base/minstd-shuffle' );
var pdifff = require( '@stdlib/math/base/special/pdifff' );

var x;
var y;
var v;
var i;

for ( i = 0; i < 100; i++ ) {
    x = minstd();
    y = minstd();
    v = pdifff( x, y );
    console.log( 'pdifff(%d,%d) = %d', x, y, v );
}
```

</section>

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* * *

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## C APIs

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### Usage

```c
#include "stdlib/math/base/special/pdifff.h
```

#### stdlib_base_pdifff( x, y )

Returns the positive difference between `x` and `y` (single-precision).

```c
float v = stdlib_base_pdifff( 4.0f, 3.0f );
// returns 1.0f
```

The function accepts the following arguments:

-   **x**: `[in] float` input value.
-   **y**: `[in] float` input value.

```c
float stdlib_base_pdifff( const float x, const float y );
```

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### Examples

```c
#include "stdlib/math/base/special/pdifff.h"
#include <stdio.h>

int main() {
    float x[] = { 3.0f, 4.0f, 6.0f, 5.0f };

    float y;
    int i;
    for ( i = 0; i < 4; i += 2 ) {
        y = stdlib_base_pdifff( x[ i ], x[ i+1 ] );
        printf( "pdifff(%f, %f) = %f\n", x[ i ], x[ i+1 ], y );
    }
}
```

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</section>

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[fdim]: http://en.cppreference.com/w/cpp/numeric/math/fdim

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