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diff --git a/3812/CH1/EX1.6.a/1_6_a.sce b/3812/CH1/EX1.6.a/1_6_a.sce
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+++ b/3812/CH1/EX1.6.a/1_6_a.sce
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+//example 1.6<a>
+//draw the waveform of the signal x1(t)=u(t+2)
+clc ;
+clear all;
+t=-10:.001:10;
+for i=1:length(t)
+if t(i)>=-2 then
+x(i)=1;
+else
+x(i)=0;
+end
+end
+plot2d(t,x);
+xtitle('Required figure','t','x(t)')