It's OK...I'm still subscribed with another address. On Nov 26, 2016 9:13 PM, "Bruno Franco" <brunofrancosala...@gmail.com> wrote:
> I was trying out the diff function and I noticed something: > > : (diff '(1 2 3 4) '(3 4)) > -> (1 2) > > but > > : (diff '(3 4) '(1 2 3 4)) > -> NIL > > I think this means that there is an order to the arguments of diff, where > the second argument must be the shortest. > I wanted to ask if this was correct, and also why was it chosen to be > this way. > > I also tried this: > > : (diff (1 2 3 4) 2) > -> (1 3 4) > > So, why does diff work even if the second argument isn't a list? > > I ran (doc 'diff), and though it explained how diff worked, it didn't > answer either of my questions. I'd be grateful for any answers you can give > me, as well as pointers to any document or reference on the internet that > explains these issues. > > Thank you very much. >
