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plot or stem the length of negative and positive signal?

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abdullah qasim
abdullah qasim on 26 Feb 2019
Commented: abdullah qasim on 26 Feb 2019
I follow positive and negative references
XNsize = length (Xn);
[XNsize, Xn, Xp]
I want to plot the signal by using "stem" as follow
stem([XNsize, Xn, Xp])
but in different colours
meaning
Xn in red
Xp in blue

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Accepted Answer

KSSV
KSSV on 26 Feb 2019
y1 = rand(10,1) ;
x1 = 1:length(y1) ;
y2 = rand(15,1) ;
x2 = [1:length(y2)]+length(y1) ;
figure
hold on
stem(x1,y1,'r')
stem(x2,y2,'b')
legend('x1','x2')

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