Neutrino Packing Machine

# npm

## calculator

0.1.12 • Public • Published

# calculator

### Install

`````` npm install calculator
cd calculator
npm start
``````

or

``````npm install -g calculator
node-calc
``````

### API

When starting calculator, it starts a node repl with all of the following properties set as properties of the `GLOBAL` object. All Math properties are replaced with `Math.(prop)` so you can write `var f = func('f(x) = sin(x)')` instead of `var f = func('f(x) = Math.sin(x)')`

#### func

``````var f = func('f(x) = x*10 - 20')
f(3) //returns 10

f = func('f(x, t) = Math.pow(x, 2) + t + 1')
f(2, 4) // returns 9
``````

#### derive

params `([string|function], point to evaluate function)` `derive('f(x) = x*x', 2) //evaluate derivative @ x = 2; returns 4`

#### integrate

params `([string|function], lower limit, upper limit)` `derive('f(x) = x*x', 0, 1) //evaluate definite integral from x = 0 to x = 1; returns .333 = 1/3`

#### accuracy

Set this property to determine how accurate the definite integral will be. Essentialy the "dx" in f(x)dx. Default is `1/1000000`

#### roundAccuracy

Set this property to determine the distance between an estimated answer and a whole number that you wish cli calc to return the rounded number. This is useful when you know the answer is a whole number and you don't want something like `1.99999999998384` returned instead of `2`

## Keywords

### Install

`npm i calculator`

### Repository

github.com/saambarati/node-calculator