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- # math-expression-evaluator
- An extremely efficient, flexible and amazing evaluator for Math expression in Javascript.([Documentation](http://bugwheels94.github.io/math-expression-evaluator/))
- ## Use cases
- |Input|Result|Explanation|
- |:---:|:---:| --- |
- |**2+3-1**|4| Addition and Subtraction operator |
- |**2\*5/10**|1| Multiplication and Division operator |
- |**tan45** *or* **tan(45)**|1| Trigonometric Function (tan in Degree mode) |
- |**tan45** *or* **tan(45)**|1.619775190543862| Trigonometric Function (tan in Radian mode) |
- |**Pi1,15,n** *or* **Pi(1,15,n)**|1307674368000| Product of Sequence |
- |**Sigma1,15,n** *or* **Sigma(1,15,n)**|120| Sum of Sequence (also called summation) |
- |**2^3**|8| Exponent (note this operator is left associative like MS Office) |
- |**5P3**|60| Permutaion Method to calculate all the permutaions |
- |**sincostan90** *or* **sin(cos(tan(90)))**|0.017261434031253| Multiple functions with or without parenthesis (both works) |
- ### [Fiddle Yourself](https://jsbin.com/romatuc/edit?html,output)
- ## Installation
- ### Node JS
- **Using npm**
- npm install math-expression-evaluator
- ### Browser
- **Using bower**
- bower install math-expression-evaluator
- ### How to run test
- npm test
- ## Supported symbols
- |Symbol|Explanation|
- |:---:|:---:|
- |**+**| 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 |
- |**&**| Bitwise AND eg. 3&1 results 1 |
- |**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 |
- |**sin**| Sine function |
- |**cos**| Cosine function |
- |**tan**| Tangent function |
- |**asin**| Inverse Sine function |
- |**acos**| Inverse Cosine function |
- |**atan**| Inverse Tangent function |
- |**sinh**| Hyperbolic Sine function |
- |**cosh**| Hyperbolic Cosine function |
- |**tanh**| Hyperbolic Tangent function |
- |**asinh**| Inverse Hyperbolic Sine function |
- |**acosh**| Inverse Hyperbolic Cosine function |
- |**atanh**| Inverse Hyperbolic Tangent function |
- ## Features
- ### 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)
- ##Changelog
- ### Removed lodash.indexof and used native Array.prototype.indexOf hence dropping suppports for IE8 and below.
- This will reflect in next release named v1.2.16
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