Hi, You are declaring a zero matrix each time inside the loop i.e for the first iteration you declare a 4*1 zero matrix and then update the first column, in the second iteration you declare a 4*2 zero matrix and update only the second column and the first column remains zero and so on. The solution for the problem is to declare a 4*4(i.e cont * cont) zero matrix outside the loop and then update the columns.
Etotalx = zeros(cont,cont); for cont_I = 1:cont for g=1:4 ....
