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I am getting NaN values after some iterations in my loop

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Lovelesh Lovelesh
评论： Matt J 2021-5-3
I get NaN values after few iterations using fourier transform this happens every time I add the fourier transform of V*psi into the equation for that I am using fft fxn
X=(-M/2:M/2-1)*dx;
dk=2*pi/(M*dx);
K=(-M/2:M/2-1)*dk;
psi=(1/sqrt(2)).*randn(1,M)+(i/sqrt(2)).*randn(1,M);
V=(X.^2)/2;
Tmax=40;
dt=0.004;
Nt=round(Tmax/dt);
Fpsi=zeros(Nt+1,M);
FVpsi=zeros(Nt,M);
Fpsisq=zeros(Nt,M);
for t=1:Nt
Fpsi(t,:)=fft(psi(t,:));
FVpsi(t,:)=fft(V.*psi(t,:));
Fpsisq(t,:)=fft((abs(psi(t,:)).^2).*psi(t,:));
Fpsi(t+1,:)=Fpsi(t,:)+dt.*(K.*K.*Fpsi(t,:)+FVpsi+g.*Fpsi);
psi(t+1,:)=ifft(Fpsi(t+1,:));
end

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回答（1 个）

Matt J
Matt J 2021-5-3
To find out where they are first introduced, you can use,
>> dbstop if naninf

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