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// Plot of -0.9^n1(-n-1)
// 4.2
exec('stem.sci',-1);
exec('label.sci',-1);
a = 0.9;
n = -10:20;
y = zeros(1,size(n,'*'));
for i = 1: length(n)
if n(i)<= -1,
y(i) = -(a^n(i));
else y(i) = 0;
end
end
stem(n,y)
label('u2',4,'Time(n)','-0.9^n1(-n-1)',4)
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