OK, thank you very much. I would just swear that I had already tried that. Cheers, Hebert.
2011/1/8 Keshav Rao Kini <krk...@ntu.edu.sg> > Hello, > > Each time you use Add, it adds perm as a new list entry in out. It does NOT > add the current value of perm as a new list entry in out, but rather inserts > a reference to the list perm. The list perm is added to the list out three > times, and by the time the function returns, perm = [1,2,3], so out consists > of three [1,2,3]. > > If you want to remember previous states of a list, you'll always need to > make a copy, because this is not done automatically when using functions > like Add. Try using for example the ShallowCopy function. > > Hope that helps. > > Yours, > Keshav > > Disclaimer: the boilerplate text at the foot of this email has been added > automatically by my mail server. This was not done by my request (rather the > opposite) so please disregard it. > > > > 2011/1/8 Hebert Pérez-Rosés <hebert.pe...@gmail.com> > >> Dear all, >> >> I'm embarrased to say this, but I'm very puzzled by the behaviour of the >> Add >> function. I have this simple test code: >> >> -------------------------------------- >> TestFun:= function(n) >> local perm, out, i; >> >> out:= []; >> perm:= []; >> for i in [1..n] do >> perm[i]:=0; >> od; >> for i in [1..n] do >> perm[i]:= i; >> Add(out, perm); >> od; >> return out; >> end; >> ---------------------------------- >> >> If I now make a call to Test(3), I should get [ [1,0,0], [1,2,0], [1,2,3] >> ], >> right? However, I'm getting [ [1,2,3], [1,2,3], [1,2,3] ]. Do you get the >> same thing? Can anybody explain to me what's happening here? >> >> Thank you very much in advance, >> >> Hebert Perez-Roses >> The University of Newcastle, Australia >> _______________________________________________ >> Forum mailing list >> Forum@mail.gap-system.org >> http://mail.gap-system.org/mailman/listinfo/forum >> > > > ------------------------------ > CONFIDENTIALITY: This email is intended solely for the person(s) named and > may be confidential and/or privileged. If you are not the intended > recipient, please delete it, notify us and do not copy, use, or disclose its > content. Thank you. > > Towards A Sustainable Earth: Print Only When Necessary > _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
