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diff --git a/3812/CH1/EX1.7.d/1_7_d.sce b/3812/CH1/EX1.7.d/1_7_d.sce
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+++ b/3812/CH1/EX1.7.d/1_7_d.sce
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+//Example 1.7<d>
+//draw the waveform of the signal x1(t)=r(3t)
+clc;
+clear all;
+t=-10:.001:10;
+for i=1:length(t)
+if t(i)>=0 then
+x(i)=3*t(i);
+else
+x(i)=0;
+end
+end
+//figure
+plot2d(x,t);
+xtitle('Required figure','t','x(t)')