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sum-product
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sum-product - npm Package Compare versions
Comparing version 0.0.3 to 1.0.0
47
index.js
@@ -1,19 +0,32 @@ | ||
| function sumProduct (array) { // can use any number of arrays | ||
| var sum = 0 | ||
| var N = Array.isArray(array) ? array.length : 0 | ||
| for (var i = 0, args = []; i < arguments.length; i++) { | ||
| // if arrays don't have the same length, we use the shortest one | ||
| if (!Array.isArray(arguments[i])) return NaN | ||
| args[i] = arguments[i] | ||
| if (args[i].length < N) N = args[i].length | ||
| } | ||
| module.exports = sumProduct | ||
| for (i = 0; i < N; i++) { | ||
| var prod = 1 | ||
| for (var j = 0; j < args.length; j++) prod *= args[j][i] | ||
| sum += prod | ||
| } | ||
| return Number(sum) | ||
| /** | ||
| * @param {array} array - first source array | ||
| * @param {array} [other] - any number of additional arrays | ||
| * @return {number} sum of the product | ||
| */ | ||
| function sumProduct (array /*other arrays*/) { | ||
| if (!arguments.length) return 0 | ||
| if (!Array.isArray(array)) return NaN | ||
| var dim = arguments.length, | ||
| len = array.length, | ||
| args = [array], | ||
| sum = 0, | ||
| err = 0, | ||
| tot = 0 | ||
| for (var i = 1; i < dim; ++i) { | ||
| if (!Array.isArray(arguments[i]) || arguments[i].length !== len) return NaN | ||
| args[i] = arguments[i] | ||
| } | ||
| //modified Kahan Sum | ||
| for (i = 0; i < len; ++i) { | ||
| var prod = 1 | ||
| for (var j = 0; j < args.length; ++j) prod *= args[j][i] | ||
| sum += prod | ||
| err += (sum - tot) - prod | ||
| tot = sum | ||
| } | ||
| return sum - err | ||
| } | ||
| module.exports = sumProduct |
| { | ||
| "name": "sum-product", | ||
| "version": "0.0.3", | ||
| "description": "classic spreadsheet sum of array item products", | ||
| "author": "Hugo Villeneuve", | ||
| "license": "MIT", | ||
| "keywords": [ | ||
| "spreadsheet", | ||
| "array", | ||
| "statistics", | ||
| "sum", | ||
| "product", | ||
| "sumproduct" | ||
| ], | ||
| "repository": { | ||
| "type": "git", | ||
| "url": "https://github.com/hville/sum-product.git" | ||
| }, | ||
| "main": "./index.js", | ||
| "dependencies": {}, | ||
| "devDependencies": { | ||
| "tt": "1.0.3", | ||
| "untap": "0.0.4" | ||
| }, | ||
| "engines": { | ||
| "node": ">= 0.10.0", | ||
| "npm": "2.x" | ||
| }, | ||
| "files": [ | ||
| "src/" | ||
| ], | ||
| "scripts": { | ||
| "test": "node test.js | untap" | ||
| } | ||
| "name": "sum-product", | ||
| "version": "1.0.0", | ||
| "description": "classic spreadsheet sum of array item products", | ||
| "author": "Hugo Villeneuve", | ||
| "license": "MIT", | ||
| "keywords": [ | ||
| "spreadsheet", | ||
| "array", | ||
| "statistics", | ||
| "sum", | ||
| "product", | ||
| "sumproduct" | ||
| ], | ||
| "repository": { | ||
| "type": "git", | ||
| "url": "https://github.com/hville/sum-product.git" | ||
| }, | ||
| "main": "./index.js", | ||
| "dependencies": {}, | ||
| "devDependencies": { | ||
| "cotest": "^1.0.1" | ||
| }, | ||
| "scripts": { | ||
| "test": "node test.js" | ||
| }, | ||
| "publishConfig": { | ||
| "registry": "https://registry.npmjs.org/" | ||
| } | ||
| } |
| # sum-product | ||
| 1. [Introduction](#introduction) | ||
| 1. [Installation](#installation) | ||
| 1. [Usage](#usage) | ||
| 1. [Test](#test) | ||
| 1. [License](#license) | ||
| • [Usage](#usage) • [Test](#test) • [License](#license) • | ||
| ## Introduction | ||
| Simple and small standalone function to calculate the sum of the product of array items. | ||
| `sumProduct([0,1], [2,3], [4,5]) // 0*2*4 + 1*3*5 = 15` | ||
| `sumProduct([0,1], [2,3], [4,5]) // 0*2*4 + 1*3*5 = 15` | ||
| ## Installation | ||
| Uses a modified Kahan sum to reduce floating point errors. | ||
| In node, from the root of your project folder type `npm install --save sum-product`. | ||
| ## Usage | ||
@@ -24,19 +14,12 @@ | ||
| ```javascript | ||
| var sumProduct = require('sum-product') | ||
| var result = sumProduct([0,1], [2,3], [4,5]) // 0*2*4 + 1*3*5 = 15 | ||
| result = sumProduct() // ==>0 | ||
| result = sumProduct([]) // ==>0 | ||
| result = sumProduct([a]) // ==>NaN | ||
| ``` | ||
| var sumProduct = require('sum-product') | ||
| var result = sumProduct([0,1], [2,3], [4,5]) // 0*2*4 + 1*3*5 = 15 | ||
| result = sumProduct() // ==>0 | ||
| result = sumProduct([]) // ==>0 | ||
| result = sumProduct([a]) // ==>NaN | ||
| ``` | ||
| ## Test | ||
| In node, from the root of your project folder type `npm test`. | ||
| ## License | ||
| Released under the [MIT License](http://www.opensource.org/licenses/MIT) |
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Improved metrics
- Total package byte prevSize
- increased by63.64%
3443
- Dev dependency count
- decreased by-50%
1
- Number of package files
- increased by66.67%
5
- Lines of code
- increased by223.53%
55
- Number of low quality alerts
- decreased by-50%
1
Worsened metrics
- Number of lines in readme file
- decreased by-40.48%
25
No dependency changes