How to stem positive part of wave?

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vu ngothanh
vu ngothanh 2015-12-11
评论： vu ngothanh 2015-12-12
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.

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Prasad Kalane
Prasad Kalane 2015-12-11
编辑：Prasad Kalane 2015-12-11
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')

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