MATLAB calculating distances in a loop

Question

I'm loading a .csv file to do a few calculations in matlab. The file itself has ~1600 lines, but I'm interested in only a subset.

load file.csv; %load file

for i = 400:1200  %rows I am interested in

  rh_x= file(i,60); % columns interested, in column 60 for the x, 61 for y
  rh_y= file(i,61);

  rh_x2 = file(i+1, 60); % next point (x,y)
  rh_y2 = file(i+1, 61);

  p1 = [rh_x, rh_y];
  p2 = [rh_x2, rh_y2];

  coord = [p1, p2]; 
  Distan = pdist(coord, 'euclidean');  ****
  disp(Distan);
end

Nothing is being stored in my Distan variable (distance formula), where I tried to input two points. Why is that the case? I'm just wanting to calculate the distance formula for all the pairs of points in rows 60 and 61 for frames 400-1200.

Thank you.

Yes, I changed it above and had it disp(coord) and it is correct. — user3295674, Nov 18 '14 at 03:38

score 2 · Accepted Answer · answered Nov 18 '14 at 03:36

2

Change your coord assignment to the following:

coord = [p1; p2];

The way you have it, it is storing all of the x, y pairs on the same row, as a 1x4 matrix. The above method stores it as a 2x2 matrix and pdist gives an answer.

answered Nov 18 '14 at 03:36

badjr

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Thank you so much, that was it! Had been a while since I had touched matlab. – user3295674 Nov 18 '14 at 03:39

MATLAB calculating distances in a loop

1 Answers1