# @stdlib/stats-iter-cumidrange

0.1.1 • Public • Published

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# itercumidrange

Create an iterator which iteratively computes a cumulative mid-range.

The mid-range, or mid-extreme, is the arithmetic mean of maximum and minimum values. Accordingly, the mid-range is the midpoint of the range and a measure of central tendency.

## Installation

`npm install @stdlib/stats-iter-cumidrange`

## Usage

`var itercumidrange = require( '@stdlib/stats-iter-cumidrange' );`

#### itercumidrange( iterator )

Returns an iterator which iteratively computes a cumulative mid-range.

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

var arr = array2iterator( [ 2.0, 1.0, 3.0, -7.0, -5.0 ] );
var it = itercumidrange( arr );

var v = it.next().value;
// returns 2.0

v = it.next().value;
// returns 1.5

v = it.next().value;
// returns 2.0

v = it.next().value;
// returns -2.0

v = it.next().value;
// returns -2.0```

## Notes

• If an iterated value is non-numeric (including `NaN`), the function returns `NaN` for all future iterations. If non-numeric iterated values are possible, you are advised to provide an `iterator` which type checks and handles non-numeric values accordingly.

## Examples

```var runif = require( '@stdlib/random-iter-uniform' );
var itercumidrange = require( '@stdlib/stats-iter-cumidrange' );

// Create an iterator for generating uniformly distributed pseudorandom numbers:
var rand = runif( -10.0, 10.0, {
'seed': 1234,
'iter': 100
});

// Create an iterator for iteratively computing a cumulative mid-range:
var it = itercumidrange( rand );

// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( typeof v.value === 'number' ) {
console.log( 'mid-range: %d', v.value );
}
if ( v.done ) {
break;
}
}```

## Notice

This package is part of 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, see the main project repository.

## Package Sidebar

### Install

`npm i @stdlib/stats-iter-cumidrange`

### Repository

github.com/stdlib-js/stats-iter-cumidrange

stdlib.io

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