dpb <email@example.com> wrote in message <firstname.lastname@example.org>... > On 10/17/2012 12:48 PM, Bruce Elliott wrote: > > dpb <email@example.com> wrote in message <firstname.lastname@example.org>... > >> > >> What's the definition of 1.0 unit(s)??? > ... > > > Presumably it's the same as the units for point 1 and point 2. > ... > > Well, that's one presumption, yes... > > But might not > > p2(1)=p2(1)-1*sign(p2(1)-p1(1)); > p2(2)=p2(2); > > Be as equally a valid definition if the point is on a grid???
Do you mean that P2 shifts by one unit in the x-direction, but doesn't move in the y-direction? I suppose the OP might have been asking that ... although I guess then it's completely ambiguous whether this motion should be in the x-direction or the y-direction (and why).
I just assumed that he wanted the point to move along the line between P1 and P2. Matt J's response is the best for that.
> > I was trying to get OP to think of what his problem statement really is > in more concrete detail. Which assessment might lead to either > > a) understanding the answer to his own question, or failing that, > b) at least getting closer to a definitive problem statement. > > Otherwise, it may be a correct answer to the wrong question... > Agreed - a little clearer explanation of what the problem is all about might help.