I read this about automatic differentiation, and thought it would be fun to play around with the idea in Haskell. I was right, it was fun.
I used Parsec to parse expressions, including variables bound to scalar values. Those expressions are then evaluated or differentiated with respect to one of the variables, like in the article. I used HUnit to write some unit tests. I used cabal to build and test the project.
TODOs:
- More tests, this thing can't possibly work
- Ditch the
<var>@<scalar>syntax and accept a range of values to bind to each variable - Graph the resulting curves
- Learn more Haskell
Run the automatic differentiation unit tests with cabal test, or the stub app using the expression parser with cabal run.