@stdlib/stats-iter-cuhmean NPM

itercuhmean

Create an iterator which iteratively computes a cumulative harmonic mean.

The harmonic mean of positive real numbers x_0, x_1, ..., x_{n-1} is defined as

Installation

npm install @stdlib/stats-iter-cuhmean

Usage

var itercuhmean = require( '@stdlib/stats-iter-cuhmean' );

itercuhmean( iterator )

Returns an iterator which iteratively computes a cumulative harmonic mean.

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

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

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

v = it.next().value;
// returns ~1.33

v = it.next().value;
// returns ~1.64

v = it.next().value;
// returns ~2.02

v = it.next().value;
// returns ~2.30

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 such values accordingly.

Examples

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

// 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 harmonic mean:
var it = itercuhmean( rand );

// Perform manual iteration...
var v;
while ( true ) {
    v = it.next();
    if ( typeof v.value === 'number' ) {
        console.log( 'hmean: %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.