Convert syms struct to numerical values

I need to add in initial condition (x,y)=(1,1). The solution, S will yield struct with fields. I'm trying to convert them to numerical values in order to plot directional fields. How do I use subs or double to convert them , I'm having a difficult time using documentation to solve this one.

syms x(t) y(t)
ode1=diff(x)==2*x+y;
ode2=diff(y)==x+y;
cond=;
odes=[ode1 ode2 cond];
S=dsolve(odes)

S = 

  struct with fields:

    y: [1×1 sym]
    x: [1×1 sym]

[KSSV]

Read about subs and double.