Problem using fft();

I have a periodic signal with TimePeriod~2.3 that is f~.4347

But I am getting another peak at f = 0.

load('myData.mat');

figure(1);
plot(tSol, omegaSol);

% This is periodic with TimePeriod~2.3 or f~.4347

Fs = length(tSol) / (max(tSol)-min(tSol));    % Sampling frequency
T = 1/Fs;                                     % Sampling period
L = Fs * (max(tSol) - min(tSol));             % Length of signal
t = (0:L-1)*T;                                % Time vector

Y = fft(omegaSol);

P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);

f = Fs*(0:(L/2))/L;

limit_f = f < 1;
f = f(limit_f);
P1 = P1(limit_f);

figure(2);
plot(f,P1) 
title('Single-Sided Amplitude Spectrum of X(t)')
xlabel('f (Hz)')
ylabel('|P1(f)|')

Why Is there another peak at f ~ 0?

Answer 1

[KSSV]

Remove the mean from the data and then use fft.

Say A is your data, (array). For fft use:

A = A-mean(A) ; 

[atharva aalok]

Yeah lol I just realised a second after posting thanks!