finding the difference between two coordinates

[alessia...@gmail.com]

Hi,

this maya be a dumb question. I basically have two points in space a(1,2,3) and b(-2,4,7) and i want to find out what values i need to add to the 'a' coordinates to get to the 'b' coordinates. If i subtract then it would give me (1-(-2)),(2-4),(3-7) = (3,-2,-4).

but then if i add these difference values back on top of the 'a' coordinates i wont get (-2,4,7), i get (4,0,-1)

this is probably a simple maths thing but im not clever :/

any help would be great,
Sam

[Nicolas Chaverou]

Need to go the other way: vector from a to b is (b-a)  {-3, 2, 4}

Best,

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[f.michal]

W dniu 2016-12-07 o 09:58, alessia...@gmail.com pisze:

You want to find vector "dist", so that:

a + dist = b

then, subtracting 'a' from both sides of equation:

dist = b - a


verify:

a + dist = b ==> a + (b-a) = b ==> b=b

:)

[s...@weacceptyou.com]

cool thanks guys, was confusing me