plot frequency/amplitude response of data from labview
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hi
i have exported data from labview to plot them in matlab.i tried but it dose not give me same plot as labview can anyone help please i have attached my data.
3 Comments
Star Strider
on 9 Oct 2019
I’ve worked with this on and off during the day, and I have no idea why the LabView and MATLAB spectra for that signal are so different. LabView must be doing something to it that it’s not telling you.
My code:
[D,S] = xlsread('shirin test.xlsx');
L = numel(D);
Fs = 2.5E9; % Sampling Frequency
t = linspace(0, L, L)*1/Fs; % Create Time Vector
Fn = Fs/2; % Nyquist Frequency
FTD = fft(D)/L; % Scaled Fourier Transform
Fv = linspace(0, 1, fix(L/2)+1)*Fn; % Frequency Vector
Iv = 1:numel(Fv); % Index Vector
figure
plot(Fv, 20*log10(abs(FTD(Iv))*2))
grid
xlim([0 2E+8])
If you can find out what LabView is doing or how it calculates the Fourier transform that makes it so different from the MATLAB result, please post back here.
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