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https://github.com/dannyben/datamix
DSL for manipulating tabular data
https://github.com/dannyben/datamix
csv data data-analysis data-engineering gem ruby tabular-data
Last synced: 29 days ago
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DSL for manipulating tabular data
- Host: GitHub
- URL: https://github.com/dannyben/datamix
- Owner: DannyBen
- License: mit
- Created: 2017-03-03T16:00:33.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2024-01-09T09:01:14.000Z (10 months ago)
- Last Synced: 2024-10-06T05:20:06.096Z (about 1 month ago)
- Topics: csv, data, data-analysis, data-engineering, gem, ruby, tabular-data
- Language: Ruby
- Size: 101 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
DataMix - DSL for manipulating tabular data
==================================================
[](https://badge.fury.io/rb/datamix)
[](https://github.com/DannyBen/datamix/actions?query=workflow%3ATest)
[](https://codeclimate.com/github/DannyBen/datamix/maintainability)
---
This library refines Ruby's [`CSV::Table`][1] and `Array` objects to provide
a DSL for manipulating tabular data.
---
Install
--------------------------------------------------
```
$ gem install datamix
```
Or with bundler:
```ruby
gem 'datamix'
```
Example Usage
--------------------------------------------------
```ruby
require 'datamix'
using DataMix
# Load data (this is a shortcut to load a CSV::Table object)
sp500 = file 'sp500.csv'
vix = file 'vix.csv'
# Keep only desired columns, rename and round data
sp500.keep :date, :adjusted_close
sp500.rename :adjusted_close, to: :close
sp500.round :close, decimals: 2
# Calculate a Change column, based on the Close column and round
sp500[:change] = sp500[:close] - sp500[:close].prev
sp500.round :change, decimals: 2
# Keep only desired columns and rename
vix.keep :date, :adjusted_close
vix.rename :adjusted_close, to: :vix
# Join the two tables
sp500.join vix, on: :date
# Remove all rows that have any empty value
sp500.delete_empty_rows
# Save and preview
sp500.save_as 'output.csv'
sp500.preview
# Output
# +------------+---------+--------+-------+
# | date | close | change | vix |
# +------------+---------+--------+-------+
# | 2015-03-12 | 2065.95 | 25.71 | 15.42 |
# | 2015-03-13 | 2053.4 | -12.55 | 16.0 |
# | 2015-03-16 | 2081.19 | 27.79 | 15.61 |
# | 2015-03-17 | 2074.28 | -6.91 | 15.66 |
# | 2015-03-18 | 2099.5 | 25.22 | 13.97 |
# | 2015-03-19 | 2089.27 | -10.23 | 14.07 |
# | 2015-03-20 | 2108.1 | 18.83 | 13.02 |
# | 2015-03-23 | 2104.42 | -3.68 | 13.41 |
# | 2015-03-24 | 2091.5 | -12.92 | 13.62 |
# | 2015-03-25 | 2061.05 | -30.45 | 15.44 |
# +------------+---------+--------+-------+
```
Examples
--------------------------------------------------
See the [examples index][2] for more examples.
[1]: https://ruby-doc.org/stdlib-2.3.1/libdoc/csv/rdoc/CSV/Table.html
[2]: https://github.com/DannyBen/datamix/tree/master/examples#examples-index