Regards, I have this curve that I show in the screen capture, but its tendency is very scattered I would like to know if there is the possibility of approaching it to a graph of the linear type by means of a filter
thank you very much
attached the data
You have broadband noise. There may be a signal at about 0.35 Hz.
The Fourier transform analysis:
D = xlsread('power.xls'); t = D(:,1); p = D(:,2);
L = length(t); Ts = mean(diff(t)); % Sampling Interval (sec) Fs = 1/Ts; % Sampling Frequency (Hz) Fn = Fs/2; % Nyquist Frequency (Hz)
FT_p = fft(p - mean(p))/L; % Fourier Transform (Discrete) Fv = linspace(0, 1, fix(length(t)/2)+1)*Fn; % Frequency Vector Iv = 1:length(Fv); % Index Vector
figure(1) plot(Fv, abs(FT_p(Iv))*2) grid
I will leave it for you to sort this.