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diff --git a/3812/CH1/EX1.6.f/1_6_f.sce b/3812/CH1/EX1.6.f/1_6_f.sce
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index 000000000..0a221ae08
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+++ b/3812/CH1/EX1.6.f/1_6_f.sce
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+//Example 1.6<f>
+//draw the waveform of the signal x6(t)=u(t+2)-u(t-2)
+clc ;
+clear all;
+t=-10:.001:10;
+for i=1:length(t)
+if t(i)>=-2 & t(i)<=2 then
+x(i)=1;
+else
+x(i)=0;
+end
+end
+//figure
+plot2d(t,x);
+xtitle('Required figure','t','x(t)')
+