Types as Interfaces
For the past few days, I have been toying with an idea for a board game. To test it out, I wanted to write a simple implementation of it. Here’s an example of a type we might need in a critical phase of the game. -- | A quote for a proposal. data Quote = Quote { _proposal :: Proposal , _premium :: Int , _share :: Int } In that phase, values of this type need to be communicated back and forth betwe
Failing at Combinatorics with Haskell
I stumbled across Jezen Thomas article on Solving a Maths Riddle with Bad Haskell recently. The challenge is described as With the digits 123456789, make them add up to 100. They must stay in the same order but you can use addition, subtraction, multiplication, division, and parentheses. All digits must be used exactly once. and Thomas, after showing his code and reasoning, concludes that Running
Inventing Fisher's Exact Test
In a previous article, we needed a way to measure how well readers could tell apart the logistic distribution from the normal distribution, to have something to sort the scoreboard by. In coming up with such a metric, I accidentally re-invented Fisher’s exact test. Here’s how it happened. Distilling the problem to its essence The situation is that we have some pictures of random distributions, whi
Huffman Codes – How Do They Work?
Tomorrow, you (a corporate spy!) will be in the office across the street and I want to signal to you what I’ve been doing throughout the day. I will do so by putting up post-it notes on a window. I have three colours of post-its: 🟥, 🟨 and 🟩.11 If a lot of people have problem with their fonts not rendering these unicode characters as coloured squares, let me know. We have just three colours, so
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Generating Almost Normally Distributed Values