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+
+
+s=%s; // first create a variable
+num=10;
+den=10+2*s+s^2;
+TF=syslin('c',num,den)
+
+t=linspace(0,5,500);
+step_res=csim('step',t,TF);
+plot(t,step_res)
+xgrid()
+xtitle('Step response','time','response');