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README.md

mathjs-expression-parser

Just want to use the expression parser of mathjs for simple, numeric calculations? Here you go...

This custom build of mathjs contains just the expression parser and basic arithmetic functions for numbers. The expression parser contains full functionality for parsing, compiling, evaluating, and transforming expression trees. Support for Matrices, BigNumbers, Fractions, Complex numbers, Units, and all functions and constants that come with mathjs are excluded.

The size of mathjs-expression-parser is 30 KiB when minified and gzipped (about a quarter of the size of mathjs).

Install

npm install mathjs-expression-parser

Use

node.js

var math = require('mathjs-expression-parser')

var expr = '2.4 + sqrt(x)';
evaluate('result', math.eval(expr, {x : 16})); // 6.4

browser

<!DOCTYPE html>
<html>
<head>
  <title>mathjs-expression-parser | basic usage</title>
  <script src="../dist/mathjs-expression-parser.js"></script>
</head>
<body>

<script>
  var expr = '2.4 + sqrt(x)';
  evaluate('result', math.eval(expr, {x : 16})); // 6.4
</script>

</body>
</html>

See the examples folder for more examples

Test

To run unit tests, install dependencies, then run:

npm test

Build

To build the bundled and minified library, install dependencies, then run:

npm run build

Publish

  • Update version number in package.json
  • Describe changes in CHANGELOG.md
  • Commit changes to git
  • Publish npm publish
  • Add git tag for current version

Included functionality

Category Functions / operators
Core import, config
Expression parse, compile, eval
Operators +, -, *, /, %, mod, `
Arithmetic abs, exp, log, sqrt, ceil, floor, random, round
Trigonometry tan, sin, cos, acos, asin, atan, atan2
Statistics max, min
Constants pi, e, true, false, null
String format
Objects Creating objects and accessing properties

Note: on new browsers there are probably more functions available, since all functions and constants from Math are imported.

License

MIT

About

Just the expression parser of mathjs

Resources

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