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diff --git a/3812/CH1/EX1.8.a/1_8_a.sce b/3812/CH1/EX1.8.a/1_8_a.sce
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+//Example 1.8<a>
+//draw the waveform of the signal x1(t)=r(t)-r(t-1)-u(t-1)
+clc;
+clear all;
+t=-10:0.001:10;
+for i=1:length(t)
+if t(i)>=0 & t(i)<1 then
+x(i)=t(i);
+else
+x(i)=0;
+end
+end
+plot2d(t,x)
+xtitle('Required figure','t','x(t)')