MATLAB: How to stem positive part of wave

stem

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.

Best Answer

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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