![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/917519/image.png)
How to flip a signal ?
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Tomaszzz
am 7 Mär. 2022
Beantwortet: Mathieu NOE
am 7 Mär. 2022
Hi all,
I have an acceleration signal during human walking (walk forward, turn around, walk back).
The attached is the 24x1 cell containing arrays of dimensions 100x 1 and each of these respresent acceleration signal between certain indices in the signal. Each array is plotted over the figure below.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/917489/image.jpeg)
When the subjects turns around, it seems the signal is flipped around resulting in a half of the arrays being a negative mirror image of the remaining half of the arrays.
This is more visible if a plot first 12 arrays and second 12 arrays on seperate figures:
%Load data
load('P_acc_y_cycle')
%Plot each array
figure
hold on
for i = 1:12
plot(P_acc_y_cycle{i},'r');
end
figure
hold on
for i = 13:24
plot(P_acc_y_cycle{i},'r') ;
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/917494/image.jpeg)
How can I flip the first part (first 12 arrays) so it resembles the second part?
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Mathieu NOE
am 7 Mär. 2022
hello
you simply apply a negative gain = -1 to your data you want vertical flipped
%Load data
load('P_acc_y_cycle')
%Plot each array
figure
hold on
for i = 1:12
plot(-P_acc_y_cycle{i},'r'); % here negative gain = -1
end
for i = 13:24
plot(P_acc_y_cycle{i},'b') ;
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/917519/image.png)
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