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diff --git a/3812/CH1/EX1.2.b/1_2_b.sce b/3812/CH1/EX1.2.b/1_2_b.sce
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+++ b/3812/CH1/EX1.2.b/1_2_b.sce
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+//example 1_2<b>
+//sketch the following signal x(3t+2)
+clc;
+clear all;
+t=-1:0.0001:-1/3;
+for i=1:length(t)
+if t(i)<-2/3 then
+x(i)=3+3*t(i);
+else
+x(i)=-1-3*t(i);
+end
+end
+plot(t,x)
+plot(t,x, 'red' );
+xtitle('required figure','t','x(3*t+2)');
+xgrid();