Programming help: MAKEMAT in CAS

[dizzy]

What am I doing wrong here?

In a program, I have:

Quote:LOCAL flist = {'2*x+y', 'y', 'x^2'};
LOCAL vlist = {'x', 'y'};
CAS(EXPR("jac:=MAKEMAT(0," + SIZE(flist) + "," + SIZE(vlist) + ")"));
MSGBOX(CAS.jac);

The message box says "jac". I'm expecting a matrix.

I've tried so many different permutations of this recipe. I just can't understand how to perform this simple task.