Re: [Haskell-beginners] Ambiguous type variables

I have another question, speaking of optimizing too soon. My data structures will be things like rows of musical notes, implementable easily as lists of lists. But I will often need to do things like replace one element in a list. Should I use Array's? As I see it, lists get me certain simplicity, and many operations using the natural syntax will be concise. But then I'll have to do searches or random access and replacement. What criteria does one use to make decisions like this? Do the easiest one first and optimize later? I'm not even sure which is easiest as I don't think there is a list element replacement function in the libraries. On Mon, Mar 17, 2014 at 3:56 PM, Dennis Raddle wrote:

On Mon, Mar 17, 2014 at 1:28 PM, Kim-Ee Yeoh wrote:

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On Tue, Mar 18, 2014 at 2:14 AM, Dennis Raddle wrote:

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class Bt d c memo | d -> c, d -> memo where

Could you also say something about the instances you intend to implement for this typeclass?

If there's only 1, which the statement of the problem suggests as much, you can dispense of the typeclass entirely and just work with plain functions!

Could be that you want something working first and generalize / polymorphize later.

I don't know yet how I want to represent the solution being searched for; i.e. I don't know how I want to represent musical structures, and I need the freedom to try different ones without rewriting my code. I also wanted to implement a few toy problems to do testing on my algorithm.

But, you are absolutely right that I am generalizing too quickly. I worked on a toy problem today and had several insights. I noticed that some problems have specifics that don't fit the same mold. -Dennis