MATLAB: How to spectral analysis a 30 year temperature series from excell data

spectral analysis

Hello! I have to do a spectral analysis to a 30 year daily temperature data that i have in excell. I was able to import the data to MatLab an plot it. But now i don't know what to do…

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There are several options for doing spectral analysis. A good first approach is to do a Fourier transform of your data with the fft (link) function. Particularly note the code between the first (top) two plot images.

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MATLAB: How to plot fourier amplitude spectrum and spectral density in matlab with given acceleration data

Your sampling frequency, ‘Fs’ is 100 Hz, according to the header line, so the Nyquist frequency, ‘Fn’ is 50 Hz.

See this documentation for fft to understand how to plot the spectrum. See specifically the code between the first two plot figures. That is the essence of what you need to know to calculate and plot the spectrum.

MATLAB: Need to convert excel (time domain data ) to frequency domain data

Assuming the Excel file contains time data in column 1 and acceleration data in column 2

% read data
data=xlsread('fileName.xlsx');
% frequency analysis
y=fft(data(:,2));
len=length(data(:,1));
n=0:len-1;
fs=50; % mention your sampling freq
N=n*fs/(len-1);
plot(N,abs(y));

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MATLAB: How to plot fourier amplitude spectrum and spectral density in matlab with given acceleration data

MATLAB: Need to convert excel (time domain data ) to frequency domain data

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