[Haskell-cafe] help with musical data structures

Michael Mossey mpm at alumni.caltech.edu
Sun Nov 15 09:20:21 EST 2009

Hi Stephen,

I will need a function that computes prime (normal?) form, of course, and 
it is just begging to be memoized. I wonder if that is possible with 
Data.Set, or whether it would be much faster using the bit vector 


Stephen Tetley wrote:
> Postscript...
> Hi Mike
> I rather overlooked your efficiency concerns, however I wouldn't be so
> concerned. By the nature of what they represent I wouldn't expect
> pitch classes to grow to a size where a bit representation out weighs
> the convenience of a list or Data.Set.
> By the same reason - I'd only use an array for the pitch matrix if I
> felt an interface favouring index-lookup was most 'comfortable'.
> Best wishes
> Stephen
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