npm package: @stdlib/math-base-special-nanmax
Description: Return the maximum value, ignoring NaN.
Author: The Stdlib Authors
Latest version: 0.1.1

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# nanmax

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> Return the maximum value, ignoring NaN.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### nanmax( x, y )

Returns the maximum value.

```javascript
var v = nanmax( 4.2, 3.14 );
// returns 4.2

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

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

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

v = nanmax( NaN, 3.14 );
// returns 3.14
```

If both arguments are `NaN`, the function returns `NaN`.

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

</section>

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

<section class="notes">

</section>

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<section class="examples">

## Examples

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

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

var m = nanmax( 3.0, 4.0 );
console.log( m );
// => 4.0

m = nanmax( NaN, 4.0 );
console.log( m );
// => 4.0

m = nanmax( 4.0, NaN );
console.log( m );
// => 4.0

m = nanmax( NaN, NaN );
console.log( m );
// => NaN
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

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<section class="usage">

### Usage

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

#### stdlib_base_nanmax( x, y )

Returns the maximum value, ignoring NaN.

```c
double out = stdlib_base_nanmax( 4.2, 3.14 );
// returns 4.2

out = stdlib_base_nanmax( 4.14, 0.0 / 0.0 );
// returns 4.14
```

The function accepts the following arguments:

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

```c
double stdlib_base_nanmax( const double x, const double y );
```

</section>

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<section class="notes">

</section>

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<!-- C API usage examples. -->

<section class="examples">

### Examples

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

int main( void ) {
    const double x[] = { 1.0, 0.45, -0.89, 0.0 / 0.0, -0.78, -0.22, 0.66, 0.11, -0.55, 0.0 };
    const double y[] = { -0.22, 0.66, 0.0, -0.55, 0.33, 1.0, 0.0 / 0.0, 0.11, 0.45, -0.78 };

    double v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_nanmax( x[i], y[i] );
        printf( "x[ %d ]: %lf, y[ %d ]: %lf, nanmax( x[ %d ], y[ %d ] ): %lf\n", i, x[ i ], i, y[ i ], i, i, v );
    }
}
```

</section>

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</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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

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

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