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diff --git a/3432/CH3/EX3.23/Ex3_23.sce b/3432/CH3/EX3.23/Ex3_23.sce
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+//Example 3.23 Oscillatory Time Response
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//------------------------------------------------------------------
+//Transfer function of second order underdamped system
+numH=[1 2];
+denH=[5 2 1];
+Ns=poly(numH,'s','coeff');
+Ds=poly(denH,'s','coeff');
+sysH=syslin('c',Ns/Ds);
+
+//damping factor (xi) and natural frequency (wn)
+[wn xi]=damp(sysH);
+wn=wn(1);
+xi=xi(1);
+sigma=xi*wn;
+wd=wn*sqrt(1-xi^2);
+
+//denominator in sigma-wn form H(s)=H1(s)+H2(s)
+s=%s;
+p=(s+sigma)^2+wd^2
+temp=polfact(Ns);
+k=temp(1),zr=temp(2);
+h1=(s+sigma)/p;
+h2=-((s+sigma)-temp(2))*wd/p;
+H1s=syslin('c',k*h1);
+H2s=syslin('c',k*h2/wd);
+
+// responses with exponential envelope
+Env=syslin('c',k/(s+sigma));
+t=0:0.02:10;
+//impulse response
+ht=csim('impuls',t,sysH);
+envt=csim('impuls',t,Env);
+envt_neg=csim('impuls',t,-Env);
+
+plot(t,ht)
+plot(t,envt,'r--')
+plot(t,envt_neg,'r--')
+exec .\fig_settings.sci; //custom script for setting figure properties
+title('Impulse response of the underdamped system','fontsize',3)
+xlabel('Time t (sec.)','fontsize',2)
+ylabel('h(t)','fontsize',2)
+xset("font",1,2)
+xstring(1,0.75,"$e^{-\sigma t}$",0,0)
+xstring(1,-0.85,"$-e^{-\sigma t}$",0,0)
+//------------------------------------------------------------------
diff --git a/3432/CH3/EX3.23/Ex3_23_f0.pdf b/3432/CH3/EX3.23/Ex3_23_f0.pdf
new file mode 100644
index 000000000..a3886b855
--- /dev/null
+++ b/3432/CH3/EX3.23/Ex3_23_f0.pdf