Does anybody now a workaround for this behaviour of vpa?:
syms a b c
c=a+b; a=1; b=1;
a + b
returns the expected ans=2. I know I could define c after a and b, but in my particular program (the above is just a minimal example), this is not possible. So I am looking for a simple workaround (vpa(char(c)) also does not work).