[Haskell-cafe] Re: [Haskell] What's up with this Haskell runtime error message:

Michael Goodrich michael.goodrich at gmail.com
Thu Apr 6 15:26:33 EDT 2006

Thank you all for your excellent comments.

I was aware of Hughe's technique and the 'whyfp' paper.

I had often thought that some kind of iteration would be necessary to reolve
this, and to overcome initially this I was cheating and using one of the
values one step late in order to break the closed cycle of references, in my
C and Prolog protype versions.

This cheat bothered me to the extent that I decided to fix it and that is
when I decided that I might be missing the boat, and Haskell might have a
built in solution to closed sets of references.

But I see now in retrospect that this was a misguided (could I say silly ?
;-)   notion and that indeed some kind of numerical algorithm will have to
be effected to get the 'pure' solution.

Again, many thanks to all, and I learned something valuable.

My faith in Haskell and FP has been restored (assuming it ever did actually



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