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https://github.com/stdlib-js/math-iter-special-expit

Create an iterator which evaluates the standard logistic function for each iterated value.
https://github.com/stdlib-js/math-iter-special-expit

expit inverse iterable iterate iterator javascript log-odds logistic logit math mathematics node node-js nodejs proportion sigmoid special stdlib

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Create an iterator which evaluates the standard logistic function for each iterated value.

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README 

        



  

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# iterExpit



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



> Create an [iterator][mdn-iterator-protocol] which evaluates the [standard logistic][@stdlib/math/base/special/expit] function for each iterated value.



## Installation



```bash

npm install @stdlib/math-iter-special-expit

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.



To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.



## Usage



```javascript

var iterExpit = require( '@stdlib/math-iter-special-expit' );

```



#### iterExpit( iterator )



Returns an [iterator][mdn-iterator-protocol] which iteratively evaluates the [standard logistic][@stdlib/math/base/special/expit] function.



```javascript

var array2iterator = require( '@stdlib/array-to-iterator' );



var it = iterExpit( array2iterator( [ 0.0, 1.0 ] ) );

// returns 



var v = it.next().value;

// returns 0.5



v = it.next().value;

// returns ~0.731



// ...

```



The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:



-   **next**: function which returns an [iterator][mdn-iterator-protocol] protocol-compliant object containing the next iterated value (if one exists) assigned to a `value` property and a `done` property having a `boolean` value indicating whether the iterator is finished.

-   **return**: function which closes an [iterator][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.



## Notes



-   If an iterated value is non-numeric (including `NaN`), the returned [iterator][mdn-iterator-protocol] returns `NaN`. If non-numeric iterated values are possible, you are advised to provide an [`iterator`][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly.

-   If an environment supports `Symbol.iterator` **and** a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.



## Examples



```javascript

var uniform = require( '@stdlib/random-iter-uniform' );

var iterExpit = require( '@stdlib/math-iter-special-expit' );



// Create a seeded iterator for generating pseudorandom numbers:

var rand = uniform( 0.0, 1.0, {

    'seed': 1234,

    'iter': 10

});



// Create an iterator which consumes the pseudorandom number iterator:

var it = iterExpit( rand );



// Perform manual iteration...

var v;

while ( true ) {

    v = it.next();

    if ( v.done ) {

        break;

    }

    console.log( v.value );

}

```



* * *



## See Also



-   [`@stdlib/math-base/special/expit`][@stdlib/math/base/special/expit]: standard logistic function.

-   [`@stdlib/math-iter/special/exp`][@stdlib/math/iter/special/exp]: create an iterator which evaluates the natural exponential function for each iterated value.

-   [`@stdlib/math-iter/special/logit`][@stdlib/math/iter/special/logit]: create an iterator which evaluates the logit function for each iterated value.



* * *



## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/math-iter-special-expit.svg

[npm-url]: https://npmjs.org/package/@stdlib/math-iter-special-expit



[test-image]: https://github.com/stdlib-js/math-iter-special-expit/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/math-iter-special-expit/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-iter-special-expit/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/math-iter-special-expit?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[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/math-iter-special-expit/tree/deno

[deno-readme]: https://github.com/stdlib-js/math-iter-special-expit/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/math-iter-special-expit/tree/umd

[umd-readme]: https://github.com/stdlib-js/math-iter-special-expit/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/math-iter-special-expit/tree/esm

[esm-readme]: https://github.com/stdlib-js/math-iter-special-expit/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/math-iter-special-expit/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-iter-special-expit/main/LICENSE



[mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol



[@stdlib/math/base/special/expit]: https://github.com/stdlib-js/math-base-special-expit



[@stdlib/math/iter/special/exp]: https://github.com/stdlib-js/math-iter-special-exp



[@stdlib/math/iter/special/logit]: https://github.com/stdlib-js/math-iter-special-logit