[Haskell-cafe] Haskell Cheat Sheet?
derek.a.elkins at gmail.com
Wed Sep 26 22:38:51 EDT 2007
On Wed, 2007-09-26 at 17:23 -0700, Dan Weston wrote:
> Not to beat a dead horse, but I wasn't suggesting to rename the fix
> function that everyone knows and loves:
> fix :: (a -> a) -> a
> fix f = let f' = f f' in f'
> I was merely trying to suggest that it would be wise to rename the
> function in http://haskell.org/haskellwiki/Reference_card that redefined
> fix to mean:
> fix :: Eq x => (x -> x) -> x -> x
> fix f x = if x == x' then x else fix f x'
> where x' = f x
> It is this latter function which I suggested to be renamed limit, since
> it returns the limit (converged value) of f^n x, where n -> inf, and
> doesn't even have the same type or arity as the standard fix function.
> Somehow this (admittedly minor) point got lost in the heat of battle.
How 'bout just 'fixpoint' or 'fixedpoint' or 'findFixedPoint'.
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