Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Move point x towards point y
Replies: 11   Last Post: Oct 17, 2012 6:54 PM

 Messages: [ Previous | Next ]
 Bruce Elliott Posts: 127 Registered: 11/9/07
Re: Move point x towards point y
Posted: Oct 17, 2012 4:07 PM

dpb <none@non.net> wrote in message <k5mvig\$q67\$1@speranza.aioe.org>...
> On 10/17/2012 12:48 PM, Bruce Elliott wrote:
> > dpb <none@non.net> wrote in message <k5mmg1\$19k\$1@speranza.aioe.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.

Date Subject Author
10/17/12 Pascal
10/17/12 Bruce Elliott
10/17/12 Pascal
10/17/12 Txuko
10/17/12 dpb
10/17/12 Bruce Elliott
10/17/12 dpb
10/17/12 Bruce Elliott
10/17/12 dpb
10/17/12 Steven Lord
10/17/12 dpb
10/17/12 Matt J