MATLAB: Transpose Translation Vector for addresses

Question

Hi, I have G =

    -1    -1    -1    -1    -1    -1    -1    -1    -1    -1    -1    -1    -1
    -1     0     0     0     0     0     0     0     0     0     0     0     0
    -1     0     0     0     0     0     0     0     5     5     5     0     0
    -1     0     0     0     0     0     0     0     0     0     5     0     0
    -1     0     0     0     0     0     0     0     0     0     5     0     0

and have translation vector for X….

X = zeros(nx,2);

[r, c] = find(G == 0); % Fill (X) with free nodes from (G)

X = [r, c]

X =

     2     2
     3     2
     4     2
     5     2
     2     3
     3     3
     4     3
     5     3
     2     4
     3     4
     4     4
     5     4
     .     .
     .     .
     .     . 
which is reading columnswise.

I would like to sort in this order

X =

     2     2
     2     3
     2     4
     .     .
     3     2
     3     3
     3     4
     .     .
     4     2
     4     3
     4     4
     .     .
     5     2
     5     3
     5     4
I have tried

X(r,c) = reshape([X' 5], [], rows – 1)'

but get:

Error using horzcat Dimensions of matrices being concatenated are not consistent.

Answer 1

   Y=sortrows(X)