Hello people, I have the following question. Is there a way to SET and GET numeric values from indexed expressions? Consider the 2 following cases: 1) For matrices. In the tutorial Section 4.13 one sees that is possible to do: matrix A(2, 2), B(2, 2), C(2, 2); A = 1, 2, 3, 4; B = -1, 0, 2, 1; C = 8, 4, 2, 1; e = indexed(A, i, k) * indexed(B, k, j) - 2 * indexed(C, i, j); So: cout << e.simplify_indexed() << endl; // -> [[-13,-6],[1,2]].i.j Is there a way to get the numeric values of each of the components of e? I would like to be able to do something like double d; d = e(0,0); to get: d=-13 2) Can something similar be done for indexed expression not defined as matrices? For example given something like symbol A("A").... idx i(.., 3), j(.., 3), k(..,10); ex e = indexed(A,i,j,k) could I set for example: i=2, j=0, k=4 and set A(2,0,4)=3.5 ? could I then somehow get the value "3.5" back? Thank you for your help! Alejandro