math-expression-evaluator

What is math-expression-evaluator?

The math-expression-evaluator is an npm package that allows for parsing and evaluating mathematical expressions. It can handle various mathematical operations, including basic arithmetic, logical operations, and functions.

What are math-expression-evaluator's main functionalities?

Evaluating Mathematical Expressions

This feature allows for the evaluation of a string-based mathematical expression, including support for functions like square root.

var mexp = require('math-expression-evaluator');
var result = mexp.eval('2+3*sqrt(4)');

Support for Variables in Expressions

This feature enables the evaluation of expressions with variables, where the values of the variables can be provided as an object.

var mexp = require('math-expression-evaluator');
var result = mexp.eval('x^2 + y', {x: 3, y: 4});

Custom Functions

This feature allows users to add custom functions to the evaluator, which can then be used in expressions.

var mexp = require('math-expression-evaluator');
mexp.addToken([
  {type: 3, token: 'sum', show: 'sum', value: function(a, b) { return a + b; }}
]);
var result = mexp.eval('sum(1,2)');

Logical Operations

This feature supports logical operations within expressions, enabling the evaluation of expressions that include logical comparisons.

var mexp = require('math-expression-evaluator');
var result = mexp.eval('1 < 2 && 3 > 2');

Other packages similar to math-expression-evaluator

mathjs

Math.js is an extensive math library for JavaScript and Node.js. It provides a wide range of features including support for units, complex numbers, matrices, and a large number of mathematical functions. Math.js is more feature-rich and can be considered more advanced than math-expression-evaluator.

algebra.js

Algebra.js allows you to define algebraic expressions and equations and perform operations on them. It is more focused on algebraic structures like fractions and equations compared to math-expression-evaluator, which is more about evaluating general mathematical expressions.

nerdamer

Nerdamer is a JavaScript library for symbolic mathematics. It is capable of handling symbolic expressions, calculus, algebra, and solving equations. Nerdamer provides more advanced features for symbolic computation compared to math-expression-evaluator.

README

Introduction

An extremely efficient, flexible and amazing evaluator with a smart parser for Math expression using Javascript.It has all the basic functions supported with extensive support for new functions, variable etc. Plus it supports Sigma and Pi notations too. Also, any human readable math expression like sincostan90 is also readable by this evaluator.

##Demonstration

#Topics

• Features
  • Supported symbols
  • Amazing support for Sigma and Pi
  • Parenthesis less expressions
• Installation
  • Node JS
  • Browser
• Test
• Documentation

Installation

Node JS

Using npm

npm install math-expression-evaluator

Browser

Using bower

bower install math-expression-evaluator

Features

##Supported symbols

+ Addition Operator eg. 2+3 results 5
- Subtraction Operator eg. 2-3 results -1
/ Division operator eg 3/2 results 1.5
* Multiplication Operator eg. 2*3 results 6
Mod Modulus Operator eg. 3 Mod 2 results 1
( Opening Parenthesis
) Closing Parenthesis
Sigma Summation eg. Sigma(1,100,n) results 5050
Pi Product eg. Pi(1,10,n) results 3628800
n Variable for Summation or Product
pi Math constant pi returns 3.14
e Math constant e returns 2.71
C Combination operator eg. 4C2 returns 6
P Permutation operator eg. 4P2 returns 12
! factorial operator eg. 4! returns 24
log logarithmic function with base 10 eg. log 1000 returns 3
ln natural log function with base e eg. ln 2 returns .3010
pow power function with two operator pow(2,3) returns 8
^ power operator eg. 2^3 returns 8
root underroot function root 4 returns 2
Trigonometric function
sin
cos
tan
asin
acos
atan
sinh
cosh
tanh
asinh
acosh
atanh

##Amazing support for Sigma and Pi
This is a fantastic feature of this calculator that it is capable of evaluating expressions containing Sigma and Pi.
Passing Sigma(1,100,n) will evaluate to 5050 as n is summationed from 1 to 100. and Pi(1,15,n) will evaluate to 1307674368000 as n is multiplied from 1 to 15 which is equal to 15!

##Parenthesis less expression If a expression is readable by human then it is readable by this evaluator. There is no need to wrap every function inside parenthesis. For eg. sin90 will work totally fine instead of sin(90)

Test

npm test