Subscript indices must either be real positive integers or logicals

Question

Abdulaziz 2011-12-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/23674-subscript-indices-must-either-be-real-positive-integers-or-logicals

关闭： MATLAB Answer Bot 2021-8-20

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When I run this script:

x=-3:.1:3;

Go=1000;

Bc=5;

Pin=@(x) 3*exp(-x.^2);

Ein(i)=quadgk(Pin,-inf,inf);

for i=1:length(x);

      z=x(i);
      Eo(i)=quadgk(Pin,-inf,z);
      E(i)=Eo (i)/Ein(i);
      G(i)=Go/(Go-(Go-1)*exp(-E(i)*0.1));
      Pin=3*exp(-x(i)^2);
      Pout(i)=Pin*G(i);
      Phi(i)=-0.5*Bc*log(G(i))*pi/180;
      Aout(i)=sqrt(Pout(i))*exp(i*Phi(i));

end

Aoutf=fftshift(fft(Aout,100000));

f=(-100000/2:(100000/2-1)).*1/(0.01*100000);

Poutf(i)=abs (Aoutf).^2;

plot(f,abs(Poutf),'-r*')

I faced this error:

Subscript indices must either be real positive integers or logicals

Please help me on that

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Walter Roberson 2011-12-12

It would help if you told us which line the problem is occurring on.

Note: you assign to Poutf(i) after the "for i" loop, and you do not have any other assignments to Poutf. Why do you make that subscripted assignment ?

此问题已关闭。

Answer 1

Andrei Bobrov 2011-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/23674-subscript-indices-must-either-be-real-positive-integers-or-logicals#answer_31095

在 MATLAB Online 中打开

try this is cod

x=-3:.1:3;
Go=1000;
Bc=5;
Pin=@(x)3*exp(-x.^2);
Ein = quadgk(Pin,-inf,inf);
Aout = zeros(size(x));
for i1=1:length(x);
      z=x(i1);      
      E1=quadgk(Pin,-inf,z)/Ein;     
      G=Go/(Go-(Go-1)*exp(-E1*0.1));    
      Pout=Pin(z)*G;      
      Phi=-0.5*Bc*log(G)*pi/180;      
      Aout(i1)=sqrt(Pout)*exp(1i*Phi);
end
Aoutf=fftshift(fft(Aout,100000));
f = (-100000/2:(100000/2-1)).*1/(0.01*100000);
Poutf = abs (Aoutf).^2;
plot(f,abs(Poutf),'-r*')