saving 3D matrix from one loop

Question

Sharif Khalil 2018-7-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410735-saving-3d-matrix-from-one-loop

评论： Sharif Khalil 2018-7-17

I have AF_Field_P that is 181X361 matrix, and I want Pp to be 1001X181X361, which means, I want to save all the values with different Xp. The output from this is only the last 181X361 matrix, which is for Xp = 1e3;

if true
  % code
end
Xp      = 20:1*Km;
Yp      = 1*Km;
rho_p   = sqrt(Xp.^2+Yp^2+HT^2);
FSPL_p  = (4*pi*rho_p/lmda).^2;   % Free Space Path Loss
for pp = 1:length(Xp)
  Pp(pp)     = (4*pi*abs(AF_Field_P).^2)/FSPL_p(pp);
end

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Answer 1

Jesus Sanchez 2018-7-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410735-saving-3d-matrix-from-one-loop#answer_329135

在 MATLAB Online 中打开

Try

 Pp = zeros(length(Xp),length(size(AF_Field_P,1)),length(size(AF_Field_P,2)));
for pp = 1:length(Xp)
 Pp(pp,:,:) = ...
end

With 3D matrix you need to address directly the dimension where you are saving the data, and then the other two. Note that the inizialization of Pp is not required, but matlab says that it is faster this way :)