Looping through Structure Elements

Question

Franco 2013-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/65357-looping-through-structure-elements

I have this code, where I am trying to loop through structure elements.

month2=struct('January',1,'February',2,'March',3,'April',4,'May',5,'June',6,'July',7,'August',8,'September',9,'October',10,'November',11,'December',12);
year2 = struct('Twelve',1,'Thirteen',2);
fieldmonths = fieldnames(month2);
fieldyear = fieldnames(year2);
for i = 1:numel(fieldyear)
  for j = 1:numel(fieldmonths)
 temp1 = Electrical.(fieldyear{i}).(fieldmonths{j})(1,1);
end
end

Anyone know why this is telling me that Electrical.Twelve.February doesnt exist?

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Answer 1

Leah 2013-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/65357-looping-through-structure-elements#answer_76893

在 MATLAB Online 中打开

Because you are referencing Electrical.Twelve.February before it's created.

I'm not sure what your code is trying to do, but try replacing the temp1 line inside the loop with this:

Electrical.(fieldyear{i}).(fieldmonths{j})=[];

This will build an empty structure.

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Franco 2013-2-28

在 MATLAB Online 中打开

I guess I should have added that Im crating the structure before..Ooops!

for i = 1:a3

    if date_4(i,1) == 1 && date_4(i,3) == 12;
        Electrical.Twelve.January(i,:) = electrical_data(i,:);
    elseif date_4(i,1) == 2 && date_4(i,3) == 12;
        Electrical.Twelve.February(i,:) = electrical_data(i,:);
    else

continue

end

Jan 2013-2-28

@Franco: But the error message tells you unequivocally, that Electrical.Twelve.February does not exist. Perhaps the is no "date_4(i,3) == 12". While you can check this using the debugger, we can only guess these details.

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