npm package: @stdlib/math-base-assert-is-negative-finite
Description: Test if a double-precision floating-point numeric value is a negative finite number.
Author: The Stdlib Authors
Latest version: 0.3.2

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# isNegativeFinite

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

> Test if a double-precision floating-point numeric value is a negative finite number.

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-assert-is-negative-finite
```

</section>

<section class="usage">

## Usage

```javascript
var isNegativeFinite = require( '@stdlib/math-base-assert-is-negative-finite' );
```

#### isNegativeFinite( x )

Tests if a double-precision floating-point `numeric` value is a negative finite number.

```javascript
var bool = isNegativeFinite( -3.14 );
// returns true

bool = isNegativeFinite( 2.0 );
// returns false
```

</section>

<!-- /.usage -->

<section class="notes">

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isNegativeFinite = require( '@stdlib/math-base-assert-is-negative-finite' );

var bool = isNegativeFinite( -3.14 );
// returns true

bool = isNegativeFinite( 3.14 );
// returns false

bool = isNegativeFinite( 0.0 );
// returns false

bool = isNegativeFinite( -0.0 );
// returns false

bool = isNegativeFinite( NaN );
// returns false
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

<!-- 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 -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/math/base/assert/is_negative_finite.h"
```

#### stdlib_base_is_negative_finite( x )

Tests if a double-precision floating-point numeric value is a negative finite number.

```c
#include <stdbool.h>

bool out = stdlib_base_is_negative_finite( 1.0 );
// returns false

out = stdlib_base_is_negative_finite( -4.0 );
// returns true
```

The function accepts the following arguments:

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

```c
bool stdlib_base_is_negative_finite( const double x );
```

</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/assert/is_negative_finite.h"
#include "stdlib/constants/float64/ninf.h"
#include <stdio.h>
#include <stdbool.h>

int main( void ) {
    const double x[] = { 5.0, -5.0, 3.14, -3.14, 0.0/0.0, STDLIB_CONSTANT_FLOAT64_NINF };

    bool b;
    int i;
    for ( i = 0; i < 6; i++ ) {
        b = stdlib_base_is_negative_finite( x[ i ] );
        printf( "x = %lf, is_negative_finite(x) = %s\n", x[ i ], ( b ) ? "True" : "False" );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/math-base/assert/is-positive-finite`][@stdlib/math/base/assert/is-positive-finite]</span><span class="delimiter">: </span><span class="description">test if a double-precision floating-point numeric value is a positive finite number.</span>
-   <span class="package-name">[`@stdlib/math-base/assert/is-nonnegative-finite`][@stdlib/math/base/assert/is-nonnegative-finite]</span><span class="delimiter">: </span><span class="description">test if a numeric value is a nonnegative finite number.</span>
-   <span class="package-name">[`@stdlib/math-base/assert/is-nonpositive-finite`][@stdlib/math/base/assert/is-nonpositive-finite]</span><span class="delimiter">: </span><span class="description">test if a numeric value is a nonpositive finite number.</span>

</section>

<!-- /.related -->

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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].

</section>

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<!-- <related-links> -->

[@stdlib/math/base/assert/is-positive-finite]: https://www.npmjs.com/package/@stdlib/math-base-assert-is-positive-finite

[@stdlib/math/base/assert/is-nonnegative-finite]: https://www.npmjs.com/package/@stdlib/math-base-assert-is-nonnegative-finite

[@stdlib/math/base/assert/is-nonpositive-finite]: https://www.npmjs.com/package/@stdlib/math-base-assert-is-nonpositive-finite

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