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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)')
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