MATLAB: Difference matrix?

cross difference by rowMATLAB

I'm not sure what this is called, but I want to calculate the cross-differences?? of values in a matrix such that:
f(  
  1 5 8
  3 6 7
  4 5 2
  6 8 1  
)
produces:
    [
       0   4  7
      -4   0  3
      -7  -3  0
    ]
    [
       0   3  4
      -3   0  1
      -4  -1  0
    ]
    [
       0   1  -2
      -1   0   3
       2  -3   0
    ]
    [
       0   2  -5
      -2   0  -7
       5   7   0
    ]
does anyone know what this is called, and how I can do it?

Best Answer

x = [1 5 8
      3 6 7
      4 5 2
      6 8 1]';
sz = size(x);
C = bsxfun(@minus,reshape(x,1,sz(1),sz(2)),reshape(x,sz(1),1,sz(2)))
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