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Compute a sum of squared absolute values incrementally, ignoring
NaNvalues.
The sum of squared absolute values is defined as
To use in Observable,
incrnansumabs2 = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/stats-incr-nansumabs2@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var incrnansumabs2 = require( 'path/to/vendor/umd/stats-incr-nansumabs2/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/stats-incr-nansumabs2@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.incrnansumabs2;
})();
</script>Returns an accumulator function which incrementally computes a sum of squared absolute values, ignoring NaN values.
var accumulator = incrnansumabs2();If provided an input value x, the accumulator function returns an updated sum. If not provided an input value x, the accumulator function returns the current sum.
var accumulator = incrnansumabs2();
var sum = accumulator( 2.0 );
// returns 4.0
sum = accumulator( -1.0 );
// returns 5.0
sum = accumulator( NaN );
// returns 5.0
sum = accumulator( -3.0 );
// returns 14.0
sum = accumulator();
// returns 14.0- Input values are not type checked. If non-numeric inputs are possible, you are advised to type check and handle accordingly before passing the value to the accumulator function.
- For long running accumulations or accumulations of large numbers, care should be taken to prevent overflow.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/stats-incr-nansumabs2@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var accumulator;
var v;
var i;
// Initialize an accumulator:
accumulator = incrnansumabs2();
// For each simulated datum, update the sum...
for ( i = 0; i < 100; i++ ) {
v = ( randu()*100.0 ) - 50.0;
accumulator( v );
}
console.log( accumulator() );
})();
</script>
</body>
</html>@stdlib/stats-incr/nansum: compute a sum incrementally, ignoring NaN values.@stdlib/stats-incr/nansumabs: compute a sum of absolute values incrementally, ignoring NaN values.@stdlib/stats-incr/sumabs2: compute a sum of squared absolute values incrementally.
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.
See LICENSE.
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