[matlab] second order saving response

K = 1;M=1;B=1

t = 0: 0.02:30;
num =[1];
den = [M B K]

den =

 1     1     1

g=tf(num,den);

y1= step(g,t);
plot (t,y1);
xlabel(‘Time(Second)’);

ylabel(‘step response’);

title(‘fuckyou’);