itermminabs

Create an iterator which iteratively computes a moving minimum absolute value.

Installation

npm install @stdlib/stats-iter-mminabs

Usage

var itermminabs = require( '@stdlib/stats-iter-mminabs' );

itermminabs( iterator, W )

Returns an iterator which iteratively computes a moving minimum absolute value. The W parameter defines the number of iterated values over which to compute the moving minimum absolute value.

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

var arr = array2iterator( [ 2.0, 1.0, 3.0, -7.0, -5.0 ] );
var it = itermminabs( arr, 3 );

// Fill the window...
var m = it.next().value; // [2.0]
// returns 2.0

m = it.next().value; // [2.0, 1.0]
// returns 1.0

m = it.next().value; // [2.0, 1.0, 3.0]
// returns 1.0

// Window begins sliding...
m = it.next().value; // [1.0, 3.0, -7.0]
// returns 1.0

m = it.next().value; // [3.0, -7.0, -5.0]
// returns 3.0

Notes

• If an iterated value is non-numeric (including NaN), the function returns NaN for at least W-1 future invocations. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
• As W values are needed to fill the window buffer, the first W-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 itermminabs = require( '@stdlib/stats-iter-mminabs' );

// 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 minimum absolute value:
var it = itermminabs( rand, 3 );

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

See Also

• @stdlib/stats-iter/minabs: compute the minimum absolute value of all iterated values.
• @stdlib/stats-iter/mmaxabs: create an iterator which iteratively computes a moving maximum absolute value.
• @stdlib/stats-iter/mmin: create an iterator which iteratively computes a moving minimum value.

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.