How to plot the error between two signals?

I can help you plot the error between the two signals. Here's a step-by-step guide on how to do it in MATLAB:

1. Load your signals: Assuming you have two signals: one filtered using MATLAB and the other filtered using your C implementation.

2. Calculate the error: Subtract one signal from the other to get the error signal.

3. Plot the signals and the error: Use MATLAB plotting functions to visualize the original, filtered, and error signals.

4. % Load your signals
   % Assuming your signals are in variables 'signal_matlab' and 'signal_c'
   % Replace these with your actual signal variables

   % Example signals (replace with your actual data)
   signal_matlab = load('signal_matlab.mat'); % Load MATLAB filtered signal
   signal_c = load('signal_c.mat');           % Load C filtered signal

   % Calculate the error
   error_signal = signal_matlab - signal_c;

   % Plot the signals
   figure;

   subplot(3, 1, 1);
   plot(signal_matlab);
   title('Filtered Signal - MATLAB');
   xlabel('Time');
   ylabel('Amplitude');

   subplot(3, 1, 2);
   plot(signal_c);
   title('Filtered Signal - C Implementation');
   xlabel('Time');
   ylabel('Amplitude');

   subplot(3, 1, 3);
   plot(error_signal);
   title('Error Signal');
   xlabel('Time');
   ylabel('Amplitude');