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diff --git a/692/CH2/EX2.22/P2_22.sce b/692/CH2/EX2.22/P2_22.sce
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+//EXAMPLE 2.22,impulse response of accumulator
+
+clear;
+clc;
+d=[1];
+t=-1:.01:1;
+h=0;
+clf();
+figure(0);
+a=gca();
+a.x_location="origin";
+
+for i=1:length(t)
+    if t(i)<0 
+      h=0;
+    else
+        h=d;
+        plot2d3(i-101,h)
+        plot(i-101,h,'.r') 
+        xtitle('Impulse Response of accumulator','t','Y');
+        a.children.children.thickness=1;
+        a.children.children.foreground=2;
+    end
+end
+disp(h,'The impulse response of Accumulator is =')