https://github.com/bertcarnell/rational

An R rational number class using a variety of class systems
https://github.com/bertcarnell/rational

r

Last synced: 17 days ago
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An R rational number class using a variety of class systems

• Host: GitHub
• URL: https://github.com/bertcarnell/rational
• Owner: bertcarnell
• License: gpl-2.0
• Created: 2015-06-29T00:42:01.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2024-07-28T20:37:29.000Z (10 months ago)
• Last Synced: 2024-07-29T14:38:55.972Z (10 months ago)
• Topics: r
• Language: R
• Size: 162 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# rational

A rational number class using a variety of class systems

[![R-CMD-CHECK](https://github.com/bertcarnell/rational/actions/workflows/r-cmd-check.yml/badge.svg)](https://github.com/bertcarnell/rational/actions/workflows/r-cmd-check.yml)

[![Coverage status](https://codecov.io/gh/bertcarnell/rational/branch/master/graph/badge.svg)](https://codecov.io/github/bertcarnell/rational?branch=master)

[Rational Website](https://bertcarnell.github.io/rational/)

## Why a Rational Package?

This package serves 2 purposes:

- Demonstrates the creation of the same classes in S3, S4, and R6 class systems

- Demonstrates one way to solve some numerical accuracy problems that people struggle with

```r

> # expectations dashed

> (0.1 + 0.2) == 0.3

[1] FALSE

> # what?

> print(0.1 + 0.2, digits = 20)

[1] 0.30000000000000004

> # what am I supposed to do in R? (or any other floating point arithmetic system)

> all.equal(0.1 + 0.2, 0.3, tolerance = 1E-9)

[1] TRUE

> abs(0.1 + 0.2 - 0.3) < 1E-9

[1] TRUE

> # is there another way?  Yes, rational numbers

> #   NOTE: the "L" notation indicates an integer

> rational(1L, 10L) + rational(2L, 10L) == rational(3L, 10L)

[1] TRUE

```