关于MATLAB 做FFT的两个问题

%%这两个都是MATLAB中的例子
% Sunspot activity is cyclical, reaching a maximum about every 11 years.  Let's
% confirm that.  Here is a plot of a quantity called the Zurich sunspot
% relative number, which measures both number and size of sunspots.
% Astronomers have tabulated this number for almost 300 years.

load sunspot.dat
year=sunspot(:,1);
relNums=sunspot(:,2);
plot(year,relNums)
title('Sunspot Data')

%%
% Here is a closer look at the first 50 years.
 
plot(year(1:50),relNums(1:50),'b.-');

%%
% The fundamental tool of signal processing is the FFT, or fast Finite Fourier
% Transform.  To take the FFT of the sunspot data type the following.
%
% The first component of Y, Y(1), is simply the sum of the data, and can be
% removed.

Y = fft(relNums);
Y(1)=[];

%%

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