Book Image

Haskell Data Analysis Cookbook

By : Nishant Shukla
Book Image

Haskell Data Analysis Cookbook

By: Nishant Shukla

Overview of this book

Table of Contents (19 chapters)
Haskell Data Analysis Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Exporting data to a CSV file


Sometimes, it's more convenient to view data using a spreadsheet program such as LibreOffice, Microsoft Office Excel, or Apple Numbers. A standard way to export and import simple spreadsheet tables is through Comma Separated Values (CSVs).

In this recipe, we will use the cassava package to easily encode a CSV file out of a data structure.

Getting ready

Install the Cassava CSV package from cabal, using the following command line:

$ cabal install cassava

How to do it…

  1. Import the relevant packages using the following code:

    import Data.Csv
    import qualified Data.ByteString.Lazy as BSL
  2. Define an association list of data that will be exported as CSV. For this recipe, we will pair letters and numbers together, as shown in the following code:

    myData :: [(Char, Int)]
    myData = zip ['A'..'Z'] [1..]
  3. Run the encode function to convert the data structure into a lazy ByteString CSV representation, as shown in the following code:

    main = BSL.writeFile "letters.csv" $ encode myData

How it...