How to find fft for a system of two variables? Can you check my code if it is right, please?

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Avan Al-Saffar
Avan Al-Saffar am 8 Aug. 2016
function aaa
b= 3;
[t,x]=ode45(@DoubleSpeciesSystem, 0:0.01:10000 , [30 6] , [] , b);
n = length(x);
h=0.01;
dt = t(end)/(n-1);
Fs=1/dt;
NFFT=n;
y=fft(x,NFFT)/n;
f=linspace(0,1,NFFT/2+1)*(Fs/4);
Pow = abs(y(1:NFFT/2 +1)).^2; % Power of the DFT
Pow(1) = 0;
figure(1) % Plot single-sided amplitude spectrum.
plot(f,Pow)
1;
%function dxdt = DoubleSpeciesSystem(t,x,b)
%x(1) = prey
% x(2) = predator
%dxdt(1) = 15 * x(1) - b * x(1).* x(2);
%dxdt(2) = -5 * x(2) + 0.5 * x(1).* x(2);
%dxdt = [dxdt(1) dxdt(2)]';
%end

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