Re: [Haskell-cafe] Re: Haskell Speed

Paul Moore wrote:

On 12/26/05, Branimir Maksimovic wrote:

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Paul Moore wrote:

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Dunno. It's certainly not a bad (executable!) definition of the problem. My point is that Haskell allows me to write *very* clear "executable pseudocode", but that code is not a good starting point for writing production-quality code.

this program counts two times length of lists of strings formed by lines, and words and third time counts again length of file. This is not just word counting program, it creates two additional lists, which are not used anywhere but to count :) While it is certainly expressive, in terms of programing is pointless. No one would write such a code for word counting.

Here is what I would write in Haskell, same logic as in C++ (i don;t know standard lib ):

Yes, that is a very reasonable way of improving performance. The original algorithm, as you say, does 3 passes through the file, and this does one, computing the 3 values "in parallel". So it does seem a sensible next step. I must try timings to see how much this improves the timings, and how much further there is to go :-)

Thanks, Paul. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe