Calculate components of a vector along a line

hello, i have 2 planes A and B, 2 points P1 (on plane A) and P2 (on plane B) and a vector v on plane B starting from point P2. I'm interested in calculating the components of the vector v along the line that passes by P1 and P2. Here is an image that could explain the situation:

How can I do this in Matlab? thanks!

Answer 1

[Chad Greene]

Do you have the x,y,z components of the two points? If yes, you could say that x2-x1 is the x component. You could then normalize this by dividing by the hypotenuse from point 1 to point 2.

Answer 2

[Matt J]

dot(v,(P1-P2)/norm(P1-P2))