Solving equations that are first parametrically solved

Hi All

if I solve a set of equations first parametrically and I end in something like : C = a^2 + 2 * b +1/R

and then I want to put numbers in a and b and R and get a result for C , how do I do that ?

I mean the code is initiated with

syms a , b , R

Answer 1

[Mischa Kim]

Farzad, you want to use the subs command

 syms a b R
 C = a^2 + 2 * b + 1/R;
 C_num = subs(C,{a,b,R},{1,2,3})
 C_num =
 16/3

[farzad]

awesome thaaanks a lot