Wolf sunspot number | Calculating the periodicity of sunspot number using FFT | MATLAB

Know more about Rudolf Wolf: https://en.wikipedia.org/wiki/Rudolf_... Dataset: Yearly mean total sunspot number http://www.sidc.be/silso/infossntotye... Code after loading the data in z variable: N=length(z); y=fft(z,N); e=y(1:floor(N/2)+1); Fs=1; f=linspace(0,Fs/2,floor(N/2)+1); stem(f,abs(e));

Prerequisite : https://www.matlabcoding.com/2020/04/marine-wave-data-analysis-with-fft.html