Perpendicular distance beween two 3D points

Hi All,

I have two 3D points in space with x, y, and z coordinates (1 and 2, red dots in the image). I want to calcuate "d". I know a bit about euclidean distances and pdist2 but not sure if this is what I need. Can someone help me?

Thanks in advance!

Answer 1

[Chunru]

d = sqrt((x1-x2).^2 + (y1-y2).^2);  % it does not depend on z

[PPM]

Thanks for your answer. Sorry but I am very obtuse in geometry. In terms of the attached image, what its inside of the parenthesis means "the square of the x coordinate of 1 + the square of the y coordinate of 2" is this correct?

[Chunru]

The square of the distance/difference along x direction between the two points + The square of the distance/difference along y direction between the two points