stdlib-js
<summary>
About stdlib...
</summary>
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
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To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
incrsum
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
Compute a sum incrementally.
bash
npm install @stdlib/stats-incr-sum
javascript
var incrsum = require( '@stdlib/stats-incr-sum' );
#### incrsum()
Returns an accumulator function which incrementally computes a sum.
javascript
var accumulator = incrsum();
#### accumulator( [x] )
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.
javascript
var accumulator = incrsum();
var sum = accumulator( 2.0 );
// returns 2.0
sum = accumulator( 1.0 );
// returns 3.0
sum = accumulator( 3.0 );
// returns 6.0
sum = accumulator();
// returns 6.0
NaN or a value which, when used in computations, results in NaN, the accumulated value is NaN for all future invocations. 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.
javascript
var randu = require( '@stdlib/random-base-randu' );
var incrsum = require( '@stdlib/stats-incr-sum' );
var accumulator;
var v;
var i;
// Initialize an accumulator:
accumulator = incrsum();
// For each simulated datum, update the sum...
for ( i = 0; i < 100; i++ ) {
v = randu() * 100.0;
accumulator( v );
}
console.log( accumulator() );
@stdlib/stats-incr/count][@stdlib/stats/incr/count]: compute a count incrementally.
- [@stdlib/stats-incr/mean][@stdlib/stats/incr/mean]: compute an arithmetic mean incrementally.
- [@stdlib/stats-incr/msum][@stdlib/stats/incr/msum]: compute a moving sum incrementally.
- [@stdlib/stats-incr/prod][@stdlib/stats/incr/prod]: compute a product incrementally.
- [@stdlib/stats-incr/summary][@stdlib/stats/incr/summary]: compute a statistical summary incrementally.
