On 10 February 2013 10:52, Gordon Royle <gordon.ro...@uwa.edu.au> wrote: > Well, thanks for the feedback, but I remain somewhat confused…
I think this is definitely a bug, and must be fixed ASAP... Best, Dima > > Firstly, why does GAP unilaterally choose to change the format .. .the > program is simply a recursive program with a single Print statement, and yet > the output changes format , and then changes back again, without me asking it > to... > > [ 1, 5, 51 ] > [ 1, 6 .. 11 ] > [ 1, 6, 12 ] > > > > > Secondly, why is > > 6 .. 11 > > the "range representation" for > > 6, 11 > > In most languages that support it, the ".." means "everything from the first > to the last (or perhaps the first to the last-minus-one)" > > > Actually, it means the same in GAP too: > > gap> for x in [6 .. 11] do >> Print(x," "); >> od; > 6 7 8 9 10 11 > > So, naively I would expect > > [1, 6 .. 11] > > to be a fancy way of saying > > [1, 6, 7, 8, 9, 10, 11] > > > But it's not: > > gap> for x in [1, 6 .. 11] do >> Print(x," "); >> od; > 1 6 11 > > > It seems dangerous to me to have the expression a .. b mean something > different to (a) other uses in the same language, (b) mathematical usage and > (c ) other programming languages. > > > Thirdly, why has this happened RIGHT NOW, when I've been using this program > for years without ever seeing anything like this before… > > > Thanks again > > Gordon > > > > Professor Gordon Royle > School of Mathematics and Statistics > University of Western Australia > gordon.ro...@uwa.edu.au<mailto:gordon.ro...@uwa.edu.au> > > > > > > > > > > > > > > _______________________________________________ > 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. Towards A Sustainable Earth:Print Only When Necessary.Thank you. _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
