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diff --git a/1499/CH2/EX2.9/q9_impulse.sce b/1499/CH2/EX2.9/q9_impulse.sce
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+
+
+s=%s; // first create a variable
+num=2*s+1;
+den=s^2;
+TF=syslin('c',num,den)
+
+t=linspace(0,5,500);
+imp_res=csim('imp',t,TF);
+plot(t,imp_res)
+xgrid()
+xtitle('Impulse response','time','response');