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Trying to plot fft,,Please help

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Avan Al-Saffar
Avan Al-Saffar 2014-8-15
关闭： MATLAB Answer Bot 2021-8-20
My code is :
function RunOsciliation5814
% Solving and ploting the Logistic model with an extra forcing parameter
% dxdt=N0*x*sin(omega*t)*(1-x/K);
N0=2; % The value of the growth rate x0=.1; % The initial condition omega=.5; % The value of osillation parameter t0=0; % The initial value of the time vector tf=200; % The final value in the time vector tspan=t0:tf; % Time vector K=10; % Carrying capacity
% Using ode45 solver to integrate the ODE [t,x]=ode45(@osciliation,[0 200],0.1,[],2,10,.5);
plot(t,x,'*-'); % Plotting Time Vs the population xlabel('t') ylabel('x') title('Time Vs population')
1;

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回答（1 个）

Salaheddin Hosseinzadeh
Hi Avan,
I wish you had provided more information about your problem.
I don't see any sign of fft in your code?! I don't really know what's your intention.
But if you just want to make a fft plot of your data, which apparently is x you may use this code I created to facilitate using fft.
It's very simple to use fft, just take a look inside the file and you'll understand how it's done.
All you need is the data and sampling frequency which is defined a Fs I believe.
I'm hoping this helps but let us know if your problem is not solved.
Good Luck

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