[Haskell-beginners] evaluation of expressions [was Re: eval command?]

Andrew Sackville-West andrew at swclan.homelinux.org
Wed Oct 29 10:48:59 EDT 2008

On Wed, Oct 29, 2008 at 07:02:46AM -0700, Andrew Sackville-West wrote:
> On Wed, Oct 29, 2008 at 09:27:32AM +0100, Tillmann Rendel wrote:

> > Since Haskell features algebraic data types, and a reasonable flexible  
> > syntax, you do not need to do any parsing. Instead, you can write down  
> > the AST of the embedded language directly as part of your Haskell  
> > program. But you have to write an evaluator. With pattern matching, that  
> > is often very easy, though.
> looks like I'm off to read about Template Haskell.

And it looks like:


is a pretty good starting point. To write a symbolic differentiator in
haskell, with evaluable results, this looks to be the way to start.

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