MATLAB: Matrix multiply by array xi=xj

matrix array

Hi, All!
say, i have a matrix:
eij= [0 1 0 1;1 0 1 1;0 1 0 1;1 1 1 0];
x1=1; x2=2; x3=3; x4=4;
how can i make array xj and xi for this function
for i=1:1:4 and j=1:1:4
xi = xj
Ai =
i hope the answer would be like this:
A1= 0(1 - 1) + 1(2 - 1) + 0(3 - 1) + 1(4 - 1)=4
A2= ...; A3=..., A4=...
i am trying to use repmat function but i am stuck. maybe anyone has better solution?

Best Answer

e = [0 1 0 1;1 0 1 1;0 1 0 1;1 1 1 0];
x = [1 2 3 4] ; 
A = zeros(size(e)) ; 
for i = 1:4
  for j = 1:4
    A(i,j) = e(i,j)*(x(i)-x(j)) ; 
  end
end
A = sum(A,2)
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