Let A=[ 1 0 0 1
1 1 0 0
0 1 1 1
0 1 0 0]
the required output is [0 1 1 0] when the bits in individual column are XORed.
I think you are XORing rows not col. very simple just do the following:
xor(xor(A(1,:),A(2,:)),xor(A(3,:),A(4,:)))
sequence will not matter as XOR is Com. and Asso.
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