Category Archives: haskell

Diagrams 1.0

The diagrams team is very pleased to announce the 1.0 release of diagrams, a framework and embedded domain-specific language for declarative drawing in Haskell. Check out the gallery for some examples of what it can do. Diagrams can be used … Continue reading

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Catsters guide

tl;dr: http://byorgey.wordpress.com/catsters-guide-2/ In an attempt to solidify and extend my knowledge of category theory, I have been working my way through the excellent series of category theory lectures posted on Youtube by Eugenia Cheng and Simon Willerton, aka the Catsters. … Continue reading

Posted in haskell, math, teaching | Tagged | 1 Comment

Come visit the FARM!

Registration is now open for the first (!) ACM SIGPLAN Workshop on Functional Art, Music, Modeling and Design (FARM), to be held in Boston on September 28 (the day after ICFP). I’m really excited—it’s shaping up to be a really … Continue reading

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Monad transformers: a cautionary tale

When writing the code in my previous post, I wanted to have a monad which combined the ability to generate random numbers with the ability to fail. Naturally, I decided to use RandT Maybe. But when I tried to write … Continue reading

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Random binary trees with a size-limited critical Boltzmann sampler

Today I’d like to talk about generating random trees. First, some imports and such (this post is literate Haskell). > {-# LANGUAGE GeneralizedNewtypeDeriving #-} > > module BoltzmannTrees where > > import Control.Applicative > import Control.Arrow ((&&&)) > import Control.Lens … Continue reading

Posted in combinatorics, haskell, math, species | Tagged , , , , , | 7 Comments

Introducing diagrams-haddock

I am quite pleased to announce the release of diagrams-haddock, a tool enabling you to easily include programmatically generated diagrams in your Haddock documentation. Why might you want to do this? “A picture is worth a thousand words”—in many instances … Continue reading

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BlogLiterately 0.6

I’m very proud to announce the release of BlogLiterately version 0.6, a tool for formatting and uploading blog posts, including syntax highlighting, generation of ghci sessions, LaTeX support, automatic image uploading, and more. tl;dr: Instead of cumbersomely specifying all options … Continue reading

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