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How to stem positive part of wave?

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vu ngothanh
vu ngothanh on 11 Dec 2015
Commented: vu ngothanh on 12 Dec 2015
Hi everyone,
I have a wave data, I need to show dispersion wave, so I need to "Stem" a "positive part" of the wave (look like the image below). Could you please to help me to solve it.
Thank you in advance.

Accepted Answer

Prasad Kalane
Prasad Kalane on 11 Dec 2015
Edited: Prasad Kalane on 11 Dec 2015
Try using following code
if true
% code
endx1=rand(1,10);
x2=rand(1,10);
x=[x1 -x2];
subplot(121);stem(x);
title('+ve & -ve Data')
for i=1:length(x)
if sign(x(i))==-1
x(i)=0;
end
end
subplot(122);stem(x);
title('+ve Data')
  1 Comment
vu ngothanh
vu ngothanh on 12 Dec 2015
Thank you very much. It work perfectly.

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