How to stem positive part of wave?

vu ngothanh

2015 12 11

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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 2015-12-11

编辑：Prasad Kalane 2015-12-11

在 MATLAB Online 中打开

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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')