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clc
clear
clf
interval=input('enter the value of time interval T between two samples');
t=(-20*interval):interval:(20*interval);
for i=1:length(t)
if t(i)<0 then
x(i)=-1;
elseif t(i)>0 then
x(i)=1;
else
x(i)=0;
end
end
plot(t,x,".");
xtitle("x(t)=1 for positive values of t..., x(t)=0 for t=0...., x(t)=-1 for negative values of t","time","amplitude");
xgrid(5)
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