npm package: @stdlib/stats-strided-rangeabs
Description: Calculate the range of absolute values of a strided array.
Author: The Stdlib Authors
Latest version: 0.1.1

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<details>
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# rangeabs

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

> Calculate the range of absolute values of a strided array.

<section class="intro">

</section>

<!-- /.intro -->

<section class="installation">

## Installation

```bash
npm install @stdlib/stats-strided-rangeabs
```

</section>

<section class="usage">

## Usage

```javascript
var rangeabs = require( '@stdlib/stats-strided-rangeabs' );
```

#### rangeabs( N, x, strideX )

Computes the range of absolute values of a strided array.

```javascript
var x = [ 1.0, -2.0, 2.0 ];

var v = rangeabs( x.length, x, 1 );
// returns 1.0
```

The function has the following parameters:

-   **N**: number of indexed elements.
-   **x**: input [`Array`][mdn-array] or [`typed array`][mdn-typed-array].
-   **strideX**: stride length for `x`.

The `N` and stride parameters determine which elements in the strided array are accessed at runtime. For example, to compute the range of absolute values for every other element in `x`,

```javascript
var x = [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0 ];

var v = rangeabs( 4, x, 2 );
// returns 3.0
```

Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.

<!-- eslint-disable stdlib/capitalized-comments -->

```javascript
var Float64Array = require( '@stdlib/array-float64' );

var x0 = new Float64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element

var v = rangeabs( 4, x1, 2 );
// returns 3.0
```

#### rangeabs.ndarray( N, x, strideX, offsetX )

Computes the range of absolute values of a strided array using alternative indexing semantics.

```javascript
var x = [ 1.0, -2.0, 2.0 ];

var v = rangeabs.ndarray( x.length, x, 1, 0 );
// returns 1.0
```

The function has the following additional parameters:

-   **offsetX**: starting index for `x`.

While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, the offset parameter supports indexing semantics based on a starting index. For example, to calculate the range of absolute values for every other element in `x` starting from the second element

```javascript
var x = [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ];

var v = rangeabs.ndarray( 4, x, 2, 1 );
// returns 3.0
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   If `N <= 0`, both functions return `NaN`.
-   Depending on the environment, the typed versions ([`drangeabs`][@stdlib/stats/strided/drangeabs], [`srangeabs`][@stdlib/stats/strided/srangeabs], etc.) are likely to be significantly more performant.
-   Both functions support array-like objects having getter and setter accessors for array element access (e.g., [`@stdlib/array-base/accessor`][@stdlib/array/base/accessor]).

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var rangeabs = require( '@stdlib/stats-strided-rangeabs' );

var x = discreteUniform( 10, -50, 50, {
    'dtype': 'float64'
});
console.log( x );

var v = rangeabs( x.length, x, 1 );
console.log( v );
```

</section>

<!-- /.examples -->

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

<section class="related">

</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

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

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

</section>

<!-- /.stdlib -->

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<section class="links">

[npm-image]: http://img.shields.io/npm/v/@stdlib/stats-strided-rangeabs.svg
[npm-url]: https://npmjs.org/package/@stdlib/stats-strided-rangeabs

[test-image]: https://github.com/stdlib-js/stats-strided-rangeabs/actions/workflows/test.yml/badge.svg?branch=v0.1.1
[test-url]: https://github.com/stdlib-js/stats-strided-rangeabs/actions/workflows/test.yml?query=branch:v0.1.1

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/stats-strided-rangeabs/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/stats-strided-rangeabs?branch=main

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[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/stats-strided-rangeabs/tree/deno
[deno-readme]: https://github.com/stdlib-js/stats-strided-rangeabs/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/stats-strided-rangeabs/tree/umd
[umd-readme]: https://github.com/stdlib-js/stats-strided-rangeabs/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/stats-strided-rangeabs/tree/esm
[esm-readme]: https://github.com/stdlib-js/stats-strided-rangeabs/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/stats-strided-rangeabs/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/stats-strided-rangeabs/main/LICENSE

[mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

[@stdlib/array/base/accessor]: https://www.npmjs.com/package/@stdlib/array-base-accessor

[@stdlib/stats/strided/drangeabs]: https://www.npmjs.com/package/@stdlib/stats-strided-drangeabs

[@stdlib/stats/strided/srangeabs]: https://www.npmjs.com/package/@stdlib/stats-strided-srangeabs

</section>

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