Round Preserving Sum

A small package to round an array of numbers, whilst still preserving the sum of all numbers.

Relevant reading:

• How to round floats to integers while preserving their sum?
• Round vector of numerics to integer while preserving their sum
• Rounding numbers preserving their sum

Installation

npm install --save round-preserving-sum

Usage

const roundPreservingSum = require('round-preserving-sum')

console.log(roundPreservingSum([0.5, 0.5, 0.5, 0.5]))
// => [ 1, 1, 0, 0 ]

API

roundPreservingSum(input)

• input (number[] | Float32Array | Float64Array, required)
• returns number[] | Float32Array | Float64Array - a new array with the numbers rounded

Fuzzing

The library has been fuzzed to make sure that the following guarantees holds:

• The rounded sum of the input numbers is always equal to the sum of the output numbers
• Every value in the output is either the floored or ceiled value of the corresponding input
• The accumulated rounding error is never more than half of the input length