Monthly Archives: August 2007

Draft of my TMR article on multiset partitions

Posted on August 23, 2007 by Brent

Here’s a draft of the article I’m writing for hopeful inclusion in the upcoming issue of The Monad.Reader: [EDIT, 11/10/2007: I’ve removed the draft version since it seems that people are finding it from searches and reading it without realizing … Continue reading →

Posted in haskell, writing | 3 Comments

Mapping over a nested functor?

Posted on August 16, 2007 by Brent

The other day I had a triply-nested list of type [[[a]]], and found myself applying this function to it: sort . map sort . map (map sort) This annoyed me. I want a way to say, “map this function over … Continue reading →

Posted in haskell, learning | 5 Comments

Rationals!

Posted on August 13, 2007 by Brent

Inspired by this totally sweet paper by Calkin & Wilf (read it for more details, it’s very short and quite elegantly written) (no really, you should read it): import Data.Ratio buildHB (x1:x2:xs) = (x1 + x2) : x1 : buildHB … Continue reading →

Posted in haskell, math | Leave a comment