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diff --git a/Working_Examples/3432/CH7/EX7.29/DEPENDENCIES/zpk_dk.sci b/Working_Examples/3432/CH7/EX7.29/DEPENDENCIES/zpk_dk.sci
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+//------------------------------------------------------------------
+//------------------------------------------------------------------
+//A function written by Deepti Khimani.
+//Usage:-
+//p=zpk_dk(sl)
+//[p, z]=zpk_dk(sl)
+//[p, z, k]=zpk_dk(sl)
+//p:- Poles of the system
+//z:- zeros of the system
+//k:- DC gain of the system
+//------------------------------------------------------------------
+//------------------------------------------------------------------
+
+function[pl,zr,k]=zpk_dk(sysmodel)
+    [lhs,rhs]=argn(0)
+
+    if rhs == 0 then
+     disp(["p=zpk_dk(sl)";"[p, z]=zpk_dk(sl)";"[p, z, k]=zpk_dk(sl)"]);
+     disp(["p:- Poles of the system";"z:- zeros of the system"]);
+     disp("k:- DC gain of the system");
+     return;
+    end
+    
+    if typeof(sysmodel)=="rational" then
+        sys=tf2ss(sysmodel);
+        pl=spec(sys.A);
+        zr=trzeros(sys);
+        temp1=poly(zr,'s','roots')/poly(pl,'s','roots');
+        temp2=sysmodel/temp1;
+        temp3=tf2ss(temp2);
+        k=temp3.D;
+    elseif typeof(sysmodel)=="state-space" then
+        pl=spec(sysmodel.A);
+        zr=trzeros(sysmodel);
+        g=ss2tf(sysmodel);
+        temp1=poly(zr,'s','roots')/poly(pl,'s','roots');
+        temp2=g/temp1;
+        temp3=tf2ss(temp2);
+        k=temp3.D
+    else
+        error("Wrong type of input argument.")
+    end 
+endfunction