29 May
2007
29 May
'07
12:19 p.m.
On Tue, May 29, 2007 at 12:15:23PM +0200, Vincent Kraeutler wrote:
Donald Bruce Stewart wrote:
P.S. Have some cute code:
Control.Monad.Fix.fix ((1:) . scanl (+) 1)
this is cute indeed! (do you keep an emergency reserve of those around for situations like this? ;-))
ever the interested amateur, i admittedly remain stumped by fix (there's evidence i'm not the only one [1])
The above code is equivalent to let l = 1 : scanl (+) 1 l in l which is a bit easier to decipher. The rest is maths and the subtleties of lazy evaluation. Best regards Tomek