MATLAB: How to get numerical value from symbolic variables equation

equationMATLABsymbolicSymbolic Math Toolbox

I have the following code

% defining T1, T2, T3, T4, T5

T = sym('T',[1 5]);

Eqn = 5*T(3);

T(3)= 6;

Now each time I call the value of Eqn it shows me 5*T(3)

How can I get a numerical value..?

iwant = subs(Eqn,T(3)) ;
iwant = double(iwant) ;

You have to substitute T(3) in the equation.

syms x(t) y(t)  
eq1 = x == y+2;  
deq = diff(eq1)
deq(t) = 
isolate(deq, diff(y))
ans = 
subs(ans, diff(x),5)
ans =

The routine name is equationsToMatrix with a lower-case 'e' and with plural 'equations'