MATLAB: Need help with finding distances in a matrix program

Question

I have an A matrix, in which I need to find the distances between the points. I have the formulas, but I need help to translate this into matlab.

Lets say that a is equal to:

A=

0 1 0 0 1 0

1 0 0 0 0 0

0 0 0 0 1 0

I have a program to create a new matrix called B,finding this points in which the first column is the number of point, the second column is the x coordinate of the point and the third column is the y coordinate. In this case will be:

B=

1 2 1

2 5 1

3 1 2

4 5 3

Here is the code for this program:

clear z

p=1;

[row,col] = size(A);

for i = 1:row

    for j=1:col
        if(A(i,j)>0)
            z(p,:)=[j,i];
            p=p+1;
        end
    end

end

B=[(1:p-1)',z] %B matrix 1 col is #of point, 2 col is xcoord,3 col is ycoord

I need to find the distances between these points, in this case will be dijx(x distance) and dijy (y distance). For this matrix these will be the distances(absolute value from one point to another point):

dijx=

0 3 1 3

3 0 4 0

1 4 0 4

3 0 4 0

dijy=

0 0 1 2

0 0 1 2

1 1 0 1

2 2 1 0

Can you help me to create a for loop code to find those distances? Thank you!!

Answer 1

[r,c]=find(A');
dij = dist([r,c]'); % dist from Neural Network Toolbox

or

[r,c]=find(A');
dijx = bsxfun(@minus,r,r');
dijy = bsxfun(@minus,c,c');
dij = hypot(dijx,dijy);