How to save the value in matrix

hi , how i can save the result in matrix form as of the same size of initial matrix, i mean it only give 1 value i want to save all the values of mat_ele in the matrix form......

regards

Answer 1

[Andrei Bobrov]

aa = abs(a);
me = aa - dx;
t = me < 0;
mat_ele = sign(a).*me;
mat_ele(t) = a(t);