How to 'flip/reverse' the signal?

Hi all,

I have a signal like this (attached). This is sensor orientation data in z dimension during human walking.

I am extracting parts of the signal between red vertiical lines (precisely between first 8 and last 8 pairs of the lines).

When I plot all of them over one figure I get this.

hold on
for i = 1:length(S_or_z_cycle)
    plot(S_or_z_cycle{i},'r') ;
    title('Shank orientation Z'); xlabel('% of movement cycle'); ylabel('degrees')
end   

Is there a way to "flip/reverse" the signal below 0 so it aligns with the signal above 0, remaining its shape? When I apply "-" I get this which is not what I want as it changes the shape of the signal.

Wheareas I want something like this:

[Mathieu NOE]

hello Tomaszzz

seems you want to apply a vertical shift of the negative data so they overlay with the positive ones

this shift is computed by taking the mean of the negative curves minus the mean of the positive curves

Answer 1

[Voss]

load('data.mat')
hold on
for i = 1:length(S_or_z_cycle)
    if mean(S_or_z_cycle{i}) > 0
        plot(S_or_z_cycle{i},'r');
    else
        plot(S_or_z_cycle{i}+360,'r');
    end
    title('Shank orientation Z'); xlabel('% of movement cycle'); ylabel('degrees')
end