time-to-botec/squiggle/node_modules/@stdlib/stats/iter/sumabs2/README.md

itersumabs2

Compute the sum of squared absolute values for all iterated values.

The sum of squared absolute values is defined as

Usage

var itersumabs2 = require( '@stdlib/stats/iter/sumabs2' );

itersumabs2( iterator )

Computes the sum of squared absolute values for all iterated values.

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

var arr = array2iterator( [ -1.0, 2.0, -3.0, 4.0 ] );

var s = itersumabs2( arr );
// returns 30.0

Notes

• If an iterated value is non-numeric (including NaN), the returned iterator returns NaN. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
• For iterators which can generate many values or which may output large numbers, care should be taken to prevent overflow.

Examples

var runif = require( '@stdlib/random/iter/uniform' );
var itersumabs2 = require( '@stdlib/stats/iter/sumabs2' );

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

// Compute the sum of squared absolute values:
var s = itersumabs2( rand );
// returns <number>

console.log( 'sumabs2: %d.', s );