Hi Fred, thanks a lot. Now it works... but (maybe it's a stupid question) why that change? :-)
regards, Fausto 2015-04-15 22:37 GMT+02:00 Frederick H. Pitts <fred.pi...@comcast.net>: > Fausto, > > Try changing the fourth line to > > z←(m-1) ack (m ack (n-1))⋄ →0 > > Regards, > > Fred > > On Wed, 2015-04-15 at 21:03 +0200, Fausto Saporito wrote: > > Hello all, > > > > > > I'm trying to implement ackerman function, but I got no luck ... and I > > cannot understand why this code doesn't work: > > > > z←m ack n > > →(m=0)/∆1 > > →(n=0)/∆2 > > z←(m-1) ack (m ack (n-1)) > > ∆1: z←n+1 ⋄ →0 > > ∆2: z←(m-1) ack 1 > > > > > > is the double recursion permitted in APL2 ? > > > > > > thanks, > > > > fausto > > > > > > >
