Calculating distance between two points from a matrix in 2d and 3d

Hi everyone!

I am new to MatLab and coding. I have a set of points in x and y coordinates, and they are sorted in a 701*14 matrix called 'rawdata'. The first two column are x and y coordinate for point#1 and the next two are the x and y coordinates for point#2 (as shown in screenshot). I want to calculate the distance between point#1 and point#2 for each row and have the resulted distance in matrix. I think I'd calculate distance by sqrt((x2 - x1) ^ 2 + (y2 - y1) ^ 2) in 2d or sqrt((x2 - x1) ^ 2 + (y2 - y1) ^ 2 + (z2 - z1) ^ 2)in 3d? But how do I write in a formatt that matlab can read and calculate?

Sorry I am a coding newb. And thank you very much for your help in advance!

Answer 1

[waqas]

This would be the implementation of your formula. But, NaN would be a problem for you since 3rd and 4th columns are NaN and would make the output distance NaN too.

dist = sqrt(((A(:,3)-A(:,1)).^2 + (A(:,4)-A(:,1)).^2))

[lisa Liang]

Thank you very much!

[paul harder]

just to clarify a minor typo, the last 1 should be a 2

dist = sqrt(((A(:,3)-A(:,1)).^2 + (A(:,4)-A(:,2)).^2))