How to cut a signal en two parts?

Hi friends, I'm new usign matlab,I would like to know, how to cut a signal en two parts? I mean, divide the low and the high part . I add a simple code and an image as a example.

ylim([0 6])

x=[0 0 5 5 5 0 0];

plot(x,'r')

[maximo,MaxFreq]=findpeaks(x,'NPeaks',1)    %%here we found the max peak, in this case is 5

media= maximo-(maximo/2)   %%here we calculate the half signal and the result is 2.5

plot(x)

hold on

plot(0:length(x),media,'*')

Thank you very much and sorry for my english.

Answer 1

[Baltam]

You better make some x-axis parameter, I called it 't'. From there on it is basically the same as wat Star strider told you.

x=[0 0 5 5 5 0 0];
t = 1:length(x); % Make x-axis value to plot
[maximo,MaxFreq]=findpeaks(x,'NPeaks',1);    %%here we found the max peak, in this case is 5
media= maximo-(maximo/2);   %%here we calculate the half signal and the result is 2.5
plot(t,x,[t(1),t(end)],[media,media])

% Make more points on the curve by using interpolation
T = linspace(0,length(x),1000);
X = interp1(1:length(x),x,T);

% Filter data dependent on media. Devide in top and bottom.
T_top = T(X>media);
T_bottom = T(X<media);
X_top = X(X>media);
X_bottom = X(X<media);

% Plot again
figure(2),
plot(T_top,X_top,T_bottom,X_bottom)

Kind regards

Baltam

[IVÁN BASTIÁN CHIMAL]

Thank you so much, that's what I need. Cheers my friend