User Portlet User Portlet

Discussions
Hi All, I'm new to Mathematica. Below is the code I have trouble with. [mcode]Do[Print[Subscript[C, k][x_, y_] =    Subscript[q, 2 k - 1] +     x*Subscript[q,      2 k] - (Subscript[q, l] + y*Subscript[q, l + 1])], {k, 3, 5,   1}, {l,...