I know this isn't exactly "advanced" or "applied" maths, but I can't think where to put it...

How would I write down the vector through the two points and ?

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- Nov 30th 2009, 01:47 AMSwlabrVector through two points
I know this isn't exactly "advanced" or "applied" maths, but I can't think where to put it...

How would I write down the vector through the two points and ? - Nov 30th 2009, 01:48 AMMoo
Hello,

Well, isn't it just ?

depending on the orientation of the vector... This one is if the vector starts at point 1 and goes to point 2. - Nov 30th 2009, 01:52 AMSwlabr
Okay...my next question is then "What does this mean?" Are the points on the vector just scalar products of that vector? I.e. , the set of points on the vector, if there exists an such that , and ?

Because then, for instance, the vector through the points (1, 1, 2) and (2, 3, 4) is (1, 2, 2), and neither of the points is a scalar multiple of the vector coordinates... - Nov 30th 2009, 01:57 AMMoo
The vector calculates the variations between the two points.

Suppose you're moving along the vector. If you increase the abscissa by , then the ordinate will be increased by and the third coordinate by

If you want to describe the points that are moving along the line passing through the two points, then they're in the form (note the difference with what you noted)

I hope this is clear... Maybe a sketch would help ya - Nov 30th 2009, 01:59 AMSwlabr