@rmath/rmathjs

Architecture

Examples

Init / Basic Ops

const rmath = require("@rmath/rmathjs")
// undefined

// Decimal
> a = rmath.decimal(12.212)
// BigDecimal { n: 12212n, b: 10n, e: 3n }
> a.toString()
// '12.212'

> b = rmath.decimal("12121291029102910291092.90192012909120381121")
> b.toString()
// '12121291029102910291092.90192012909120381121'

// Fraction
> c = rmath.fraction("12/19")
> c.toString()
// 12/19

// Complex 
> d = rmath.complex("1+2i")
> d.toString()
// 1+2i

Basic Operations

const {decimal} = require("@rmath/rmathjs")

> decimal("121021929102910290194803948309.02910980924808409809380198309810923810928").powz(3).toString()
'1772524366559130330423516606044188242503094282693570981567002894721938643539260475274094.63818437406854206813360000829142'

const {fraction} = require("@rmath/rmathjs")
// add two fractions
> fraction("12/19").add("1/2").toString()
// '43/38'

// multiply two complex numbers
> complex("1+i").mul("4+12i").toString()
// '-8.0+16.0i'

Arithmetic

This has couple of arithmetic function

const {u, I, mu, phi, mangoldt} = require("@rmath/rmathjs")
> phi(10)
// 4n
> mu(11)
// -1n

Primes

Implemented few operation with primes

const {primes, is_prime, pi} = require("@rmath/rmathjs")
// prime counting function
> pi(10000)
1229
> pi(100)
25
> pi(1000)
168

// primes less than 100
> primes(100)
// [
//    2,  3,  5,  7, 11, 13, 17, 19,
//   23, 29, 31, 37, 41, 43, 47, 53,
//   59, 61, 67, 71, 73, 79, 83, 89,
//   97
// ]

// prime checker, determines probable prime
> is_prime(11111111111111111111777777777n)
// true
> is_prime(111111111111111111117777777777n)
// false

Factors

Factors has functions implementation for factorize the numbers. Currently all implementation uses trial and division. Need to implement for more optimize algos.

> const {factorize, factors} = require("@rmath/rmathjs")
// returns factorization of number using trial and division
> factorize(111111111111111111117777777777n) // 111111111111111111117777777777 = 1 * 3 ^ 2 * 11 * 41 * 43 * 103 * 271 * 463 * 499 * 9091 * 10858510951
// [
//   { k: 1, p: 1 },
//   { p: 3n, k: 2 },
//   { p: 11n, k: 1 },
//   { p: 41n, k: 1 },
//   { p: 43n, k: 1 },
//   { p: 103n, k: 1 },
//   { p: 271n, k: 1 },
//   { p: 463n, k: 1 },
//   { p: 499n, k: 1 },
//   { p: 9091n, k: 1 },
//   { p: 10858510951n, k: 1 }
// ]

// removes specified factor from number. 
> factor_out(1000, 2) // 1000 = 2 ^ 2 * 125
{ f: { p: 2n, k: 3n }, d: 125n }

Convections

Naming Convections

1. Class / Interface / types should be in CapitalCammelCase.
2. Variable name should be in flatcase / snake_case
3. Constants should be in UPPER_CASE.

Motivation

Motivation is to create libary able to do any mathematical task in js efficiently.

Mentions

Below software / tools helped rmathjs to get is struture.

1. Regex helper -> https://regex101.com/r
2. decimal.js -> https://github.com/MikeMcl/decimal.js/