Can MATLAB Handle a Triple Nested Struct?

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Elliott Tung
Elliott Tung 2020-10-21
编辑： Stephen23 2020-10-22
I am trying to create a Calendar struct where it has Month struct and within the Month struct there is a Day struct. So far I have been able to get the Month struct to work within the Calendar struct :
Calendar = {};
Calendar.year = int8.empty;
Calendar.Month = {};
for i = 1:length(SIData)
Calendar(i).year = SIData(i).year;
Calendar(i).Month(1).month = 'January';
Calendar(i).Month(2).month = 'February';
Calendar(i).Month(3).month = 'March';
Calendar(i).Month(4).month = 'April';
Calendar(i).Month(5).month = 'May';
Calendar(i).Month(6).month = 'June';
Calendar(i).Month(7).month = 'July';
Calendar(i).Month(8).month = 'August';
Calendar(i).Month(9).month = 'September';
Calendar(i).Month(10).month = 'October';
Calendar(i).Month(11).month = 'November';
Calendar(i).Month(12).month = 'December';
end
However I cannot get the Day struct to go into the Month struct without throwing an error:
for i = 1:length(Calendar)
Calendar(i).Month.Day = {};
end
Error Message:
Scalar structure required for this assignment.
Error in Solar_Calc (line 32)
Calendar(i).Month.Day = {};
Any ideas to fix this problem would be greatly appreciated.
Thanks!
  2 个评论
Stephen23
Stephen23 2020-10-22
编辑：Stephen23 2020-10-22
"Can MATLAB Handle a Triple Nested Struct?"
Yes.
Your data is very complex. Why are you assigning an empty cell array on one line:
Calendar = {};
and then replacing that and/or assigning lots of individual scalar structures? It appears that there is some confusion about data types: the best way to preallocate a structure is to use the struct command, and avoid
For such simple data your data design is ... complex. You should consider simplifying it.

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回答（2 个）

Jeff Miller
Jeff Miller 2020-10-21
Haven't tried it, but it seems like this should work:
for i = 1:length(Calendar)
for j=1:12
Calendar(i).Month(j).Day = {};
end
end
Walter Roberson
Walter Roberson 2020-10-21
Calendar = struct('Month', repmat({struct('month', '', 'Day', cell(31,1))},12,1), 'year', int8.empty);
The result is a 12 x 1 struct with fields Month and year. Each Month is a 31 x 1 struct with fields 'month' and 'Day'.
Might I suggest that this is not the structure that you want? There is no point in repeating month 31 times.

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