access data in structure?

Question

Najmeh Eskandari 2019-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443758-access-data-in-structure

编辑： Luna 2019-2-7

Hi.

I store some data in structure :

H0=struct('h',[0,0],'Q_centroid',[0,0],'Q_action',[.5,.51,.5,.51],'Q_table',[0]);
H1=struct('h',[0,2],'Q_centroid',[5,0],'Q_action',[.5,1,.5,1],'Q_table',[1;2]);
L0=struct('H0',H0,'H1',H1);
L0Names = fieldnames(L0);
n=numel(L0Names);
i=1;
for loopIndex = 1:numel(L0Names) 
    stuff = L0.(L0Names{loopIndex});
    w{i}=stuff;
    e(i,:)=w.h;
    i=i+1;
    
end 

i want to access h in each H0 and H1 in loop and store them in a matrix 2 by 2 (e=[0 0;0 2]). how can i do this?

i use e(i,:)=w.h but there is an error.

Thanks

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Answer 1

Luna 2019-2-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443758-access-data-in-structure#answer_360000

编辑：Luna 2019-2-7

在 MATLAB Online 中打开

You are almost there.

Try this:

H0=struct('h',[0,0],'Q_centroid',[0,0],'Q_action',[.5,.51,.5,.51],'Q_table',[0]);
H1=struct('h',[0,2],'Q_centroid',[5,0],'Q_action',[.5,1,.5,1],'Q_table',[1;2]);
L0=struct('H0',H0,'H1',H1);
L0Names = fieldnames(L0);
n=numel(L0Names);
stuff = nan(numel(L0Names),2); % preallocation
for i = 1:numel(L0Names)     
    stuff(i,:) = L0.(L0Names{i}).h; % goes like this: L0.H0.h, L0.H1.h,.... etc 
end 