The plot for Frequency Domain Signal wont show up, where is the problem?

t = readmatrix('10pc_NFhpf.csv');

%sample rate
dt = 2.5e-07
%sample FREQUENCY
fs = 1/dt;

%time domain signal
figure
plot(t(1:2002,2));
title('Time Domain Signal');
xlabel('Time (t)');
ylabel('Amplitude');

t = t(1:2002,2);
t_f = fft(t);
m = length(t_f);
freq = (-m/2:(m/2-1))*fs/(m-1);
figure
plot(freq,fftshift(abs(t_f)));
title('Frequency Domain Signal');
xlabel('Frequency (Hz)');
ylabel('Amplitude');

Answer 1

[Ayush Modi]

Hi,

When running the provided code, with the attached file, variable t_f is being calculated to NaN values.

% Output of disp(t_f)
      NaN + 0.0000i
      NaN +    NaNi
      NaN +    NaNi
      NaN +    NaNi
      NaN +    NaNi
      . . .
      

However, MATLAB does not plot NaN values and so the plot is not visible.

I would suggest to recheck the values in the attached file.