Hey, I think this is what you require. This basically takes a mean over the diagonally opposite numbers, to create a symmetrical matrix.
% replace with the needed matrix
matrix = [1,2,3 ; 4,5,6 ; 7,8,9];
display(matrix)
% row/column size
siz = size(matrix);
n = siz(1);
for i= 1:n
for j = i:n
matrix(i,j) = (matrix(i,j)+matrix(j,i))/2;
matrix(j,i) = matrix(i,j);
end
end
display(matrix);
