@stdlib/stats-iter-cugmean

Create an iterator which iteratively computes a cumulative geometric mean.

Usage no npm install needed!

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README

itercugmean

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Create an iterator which iteratively computes a cumulative geometric mean.

The geometric mean is defined as the nth root of a product of n numbers.

Equation for the geometric mean.

Installation

npm install @stdlib/stats-iter-cugmean

Usage

var itercugmean = require( '@stdlib/stats-iter-cugmean' );

itercugmean( iterator )

Returns an iterator which iteratively computes a cumulative geometric mean.

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

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

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

v = it.next().value;
// returns ~1.41

v = it.next().value;
// returns ~1.82

v = it.next().value;
// returns ~2.55

v = it.next().value;
// returns ~2.91

Notes

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

Examples

var runif = require( '@stdlib/random-iter-uniform' );
var itercugmean = require( '@stdlib/stats-iter-cugmean' );

// Create an iterator for generating uniformly distributed pseudorandom numbers:
var rand = runif( 0.0, 10.0, {
    'seed': 1234,
    'iter': 100
});

// Create an iterator for iteratively computing a cumulative geometric mean:
var it = itercugmean( rand );

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

See Also

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.

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License

See LICENSE.

Copyright

Copyright © 2016-2022. The Stdlib Authors.