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diff --git a/3812/CH1/EX1.2.a/1_2_a.sce b/3812/CH1/EX1.2.a/1_2_a.sce
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+++ b/3812/CH1/EX1.2.a/1_2_a.sce
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+//example 1_2<a>
+//sketch the following signal x(3t)
+clc;
+clear all;
+t=-1/3:0.0001:1/3;
+for i=1:length(t)
+if t(i)<0 then
+x(i)=1+3*t(i);
+else
+x(i)=1-3*t(i);
+end
+end
+plot2d(t,x)
+plot (t,x, 'red' );
+xtitle('required figure','t','x(3*t)');
+xgrid();