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diff --git a/2279/CH4/EX4.26/Ex4_26.sce b/2279/CH4/EX4.26/Ex4_26.sce
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+//Interconnectiuion of LTI systems
+n=-10:10;
+for i=1:length(n)
+    if(n(i)==0)
+        h1(i)=2;
+    else
+        h1(i)=1;
+    end
+end
+for i=1:length(n)
+    if(n(i)==2)
+        h2(i)=1;
+    else
+        h2(i)=0;
+    end
+end
+for i=1:length(n)
+    if(n(i)>=1)
+        h3(i)=1;
+    else
+        h3(i)=0;
+end
+end
+for i=1:length(n)
+    if(n(i)>= -1)
+        h4(i)=1;
+    else
+        h4(i)=0;
+    end
+end
+for i=1:length(n)
+    h5(i)=n(i);
+    h6(i)=1;
+end
+h23=h2.*h3;
+h234=h4+h23;
+h1234=h1.*h234;
+h56=h5.*h6;
+h=h56+h1234;
+x=[1 -0.5];
+n1=[0 1];
+y=convol(x,h);
+n2=-10:11;
+subplot(3,1,1)
+xtitle("input signal x(n)","....................n","x[n]");
+plot(n1,x,'.');
+subplot(3,1,2)
+xtitle("system response h(n)","....................n","h[n]");
+plot(n,h,'.');
+subplot(3,1,3)
+xtitle("output signal y(n)",".............................n","y[n]");
+plot(n2,y,'.');