Compose code performing FFT

Aditya Hegde_22173

1)I have been trying to perform FFT using time domain data. The time domain data that I have is in excel format and with data points up to 100000. Can somebody tell me what is wrong with my code as the FFT I am obtaining here doesn't match with the one which i have performed in other softwares. (code attached below) 

Code:

data= xlsread('pave_25_time_data.xlsx'); 
Time=data(:,1); 
Acc=data(:,2); 

figure(1); 
plot(Time,Acc);  

L= numel(Time); 
Y = fft (Acc); 
P2 = abs (Y/L); 
P1 = P2(1:L/2+1); 
P1(1:end-1) = 2*P1(1:end-1); 
f = (0:(L/2))/2; 
figure(2); 

plot(f,P1); 

 

 

 

João Marabisa

Hello @Aditya Hegde,

This could be due to the headers. The easiest way to do it is using:

I compared the results with Octave and they match:

Attaching the files that I used.

pave_25_time_data.xlsx

testing_fft.oml