Lazy Numerical Analysis

This takes Haskell code by John Hughes and translates it to Ruby to play around with using infinite sequences in an eagerly evaluated language. It is the companion code for a blog post on using infinite sequences in Haskell and Ruby.

Running the code

For Ruby, you need Ruby 2.0 or greater:

$ irb
require_relative 'numerical_analysis'
sqrt 1000
# => 31.622776601684336

I used Stack to install Haskell. Then you can run:

$ stack ghci
:load numerical_analysis.hs
*Main> sqrt 1000
31.622776601684336
*Main> deriv (**2) 5
10.00006103515625

Futher reading

• Why Functional Programming Matters
• Modular Code and Lazy Evaluation in Haskell
• Infinite Sequences in Ruby
• Exploring infinite sequences