How to plot the fft if we are having the data ?

10 vues (au cours des 30 derniers jours)
vimal kumar chawda
vimal kumar chawda le 9 Juil 2021
load('Lp_400_Bw5.mat')
xlsread('Messdaten');
time=ans(:,1); % Time vector
data = ans(:,2);
Messdaten1=ans(:,2);
fs=1/1.000000000000000e-03;
N=size(Messdaten1);
% X=fft({Messdaten}*2/N;
%f=fs/(N)*(1:N)
hfp = fplot(Messdaten1);
xv = hfp.XData;
yv = hfp.YData;
X=fft(yv);
Error is Error using fft
Invalid data type. First argument must be double, single, int8, uint8, int16, uint16, int32, uint32, or
logical.

Réponses (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov le 10 Juil 2021
Hi,
Here is a correct and complete code for fft calc and plot with your data given in .xls data file:
clearvars; clf;
D=readtable('Messdaten.xls');
time=D.Var1; % Time
X = D.Var2; % Data
Fs=1e3; % Sampling frequency, [Hz]
L = length(X);
N = 2^nextpow2(L);
Y = fft(X, N);
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;
plot(f,P1)
title('Single-Sided Amplitude Spectrum of S(t)')
xlabel('f (Hz)')
ylabel('|P1(f)|')

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R2021a

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