I want to calculate the inverse fourier transform to see if I retrieve my original time series data. My excel file contains time(xaxis) and distance(yaxis). I already transformed the data into the frequency domain using DFT.

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Akash Pandya
Akash Pandya 2018-10-15
[X] = xlsread('40mgml.xlsx'); %import and read excel file
xdft = fft(X(:,2));
DT = X(2,1)-X(1,1); % sampling interval -- assuming equal sampling
Fs = 1/DT; % sampling frequency
DF = Fs/size(X,1);
freq = 0:DF:Fs/2;
xdft = xdft(1:length(xdft)/2+1);
plot(freq,abs(xdft))
xlabel('Frequency (ns^-^1)')
ylabel('Power (nm^2)')
set(gca, 'YScale', 'log')
set(gca, 'XScale', 'log')

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