Note

Project is retired and not under active development.

YASMIJ.js

Purpose:

YASMIJ stands for Yet Another Simplex Method Library for Javascript. The purpose of this project is to provide a simple Simplex Method library for Javascript. The simplex method is a popular algorithm for linear programming. It is used to solve optimization by using of artifical variables and/or branch and bound.

Notes:

• Yasmij.js is a small side project that I work on in my spare time.
• CommonJS bundlers will place a global YASMIJ onto the window Please feel free to contribute.

Version

BETA 0.2.5 - (unstable)

Dependencies

None

Installation

• require('yasmij'), or
• include <script src="./dist/yasmij.js"></script> from this repo

Environment

Run the test cases to determine support. In general, yasmij.js should be supported in Javascript ES5 environments. Ex. Chrome 10+, Firefox 12+, IE9+ and Node.js

Documentation

Refer to the docs folder

Please read the test cases to understand how everything works.

Change Log

Refer to history.md

Issues / Help

Please raise a ticket for help.

Example:

Maximize x1 + 2x2 - x3

Subject to
2x1 + x2 + x3 <= 14,
4x1 + 2x2 + 3x3 <= 28,
2x1 + 5x2 + 5x3 <= 30

where 0 <= x1, x2, x3

Input

var input = {
	type: "maximize",
	objective : "x1 + 2x2 - x3",
	constraints : [
		"2x1 + x2 + x3 <= 14",
		"4x1 + 2x2 + 3x3 <= 28",
		"2x1 + 5x2 + 5x3 <= 30"
	]
};
var output = YASMIJ.solve( input );

Output

JSON.stringify(output, null, 2)
// returns
"{
  "result": {
	"slack1": 0,
	"slack2": 0,
	"slack3": 0,
	"x1": 5,
	"x2": 4,
	"x3": 0,
	"z": 13
  }
}"

Roadmap

Version 0.3:

• Add support for Minimization (Standard and Non-standard)
• Add documentation.
• Add build script

Version 0.4:

• Add support for unrestricted variables.