Summing up values in a matrix
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I have a 4D matrix, I(i,j,y,x) which has dimensions of 64 x 64 x 70 x 160. For each coordinate in y and x I'd like to sum all the values for I across i and j to form a 2D matrix I_y_x. i.e. I_y_x(0,0) = I(1,1,0,0)+I(1,2,0,0)+I(1,3,0,0) + .... + I(2,1,0,0) etc.
Thanks in advance
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