help with programming in matlab - laplace and stepinfo to see overshooting

in my program i'm trying to see a functions settling time and over-shoot, it can be usually done with "stepinfo", but i cannot manage to do it right, what can i do better?

syms s t
c=1200; k=1/6;
G=1/(3*s^2+c*s+k);
y=ilaplace(G,s,t);
fplot(matlabFunction(y), [0,5],'r')
grid on
title('The Shock Response - y(t)','fontweight','bold')
xlabel('t(sec)')
ylabel('y(m)')
legend('y(t)')
t=0:0.01:10;
stepinfo(y,t);

the errors:

Error using stepinfo (line 58)
The input arguments "Y" and "T" of the "stepinfo" and "lsiminfo" command must have compatible sizes.

Error in q2C (line 15)
stepinfo(y,t);

Sagi.