A = zeros(5);  # create 5x5 matrix filled with zeros
B = ones(7);   # create 7x7 matrix filled with ones
I = eye(10);   # create 10x10 matrix filled with ones on diagonal and zeros elsewhere
D1 = A.+B' ; # add element-wise A with transpose of B
D2 -= A.-B' ; # substract element-wise A with transpose of B
D3 *= A.*B' ; # multiply element-wise A with transpose of B
D4 /= A./B' ; # divide element-wise A with transpose of B