@stdlib/stats-iter-mrange
v0.2.2
Published
Create an iterator which iteratively computes a moving range.
Downloads
114
Readme
itermrange
Create an iterator which iteratively computes a moving range.
The range is defined as the difference between the maximum and minimum values.
Installation
npm install @stdlib/stats-iter-mrange
Usage
var itermrange = require( '@stdlib/stats-iter-mrange' );
itermrange( iterator, W )
Returns an iterator which iteratively computes a moving range. The W
parameter defines the number of iterated values over which to compute the moving range.
var array2iterator = require( '@stdlib/array-to-iterator' );
var arr = array2iterator( [ 2.0, 1.0, 3.0, -7.0, -5.0 ] );
var it = itermrange( arr, 3 );
// Fill the window...
var v = it.next().value; // [2.0]
// returns 0.0
v = it.next().value; // [2.0, 1.0]
// returns 1.0
v = it.next().value; // [2.0, 1.0, 3.0]
// returns 2.0
// Window begins sliding...
v = it.next().value; // [1.0, 3.0, -7.0]
// returns 10.0
v = it.next().value; // [3.0, -7.0, -5.0]
// returns 10.0
Notes
- If an iterated value is non-numeric (including
NaN
), the function returnsNaN
for at leastW-1
future invocations. If non-numeric iterated values are possible, you are advised to provide aniterator
which type checks and handles non-numeric values accordingly. - As
W
values are needed to fill the window buffer, the firstW-1
returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all previously iterated values.
Examples
var runif = require( '@stdlib/random-iter-uniform' );
var itermrange = require( '@stdlib/stats-iter-mrange' );
// 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 moving range:
var it = itermrange( rand, 3 );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
if ( typeof v.value === 'number' ) {
console.log( 'range: %d', v.value );
}
}
See Also
@stdlib/stats-iter/mmax
: create an iterator which iteratively computes a moving maximum value.@stdlib/stats-iter/mmean
: create an iterator which iteratively computes a moving arithmetic mean.@stdlib/stats-iter/mmin
: create an iterator which iteratively computes a moving minimum value.@stdlib/stats-iter/range
: compute the range of all iterated values.
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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.