Struct variables don't save

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Cary
Cary 2015-11-17
编辑： Stephen23 2015-11-18
I have various matrices and I'd like them to be part of a struct. Each matrix is computed on its own, assigned to the struct, then the workspace is cleared except for the struct and its variables (clearvars -except matrices). My problem is when the program is finished, only the last variable in the struct is saved/exists. My syntax looks something like this:
matrices=struct; %initialize the struct
Next I compute the matrix and assign it
matrices.s1=matrix; %assign
Then I compute the next matrix and assign it
matrices.s2=matrix; % assign
I do this for about 30 matrices and when the program finishes, only one variable is in the struct - the most recent one. How can I overcome this? Many thanks.
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Walter Roberson
Walter Roberson 2015-11-17
Try commenting out the "clearvars" and seeing if that works.
Stephen23
Stephen23 2015-11-18
编辑：Stephen23 2015-11-18
You should probably switch to using a non-scalar structure, which would simplify assigning the values to the fields. Using non-scalar structures makes accessing the data much easier than using numbered field names!
Examples of using non-scalar structures:
http://www.mathworks.com/matlabcentral/answers/184939-how-to-save-values-into-a-data-structure-within-a-loop
http://www.mathworks.com/matlabcentral/answers/184582-how-to-make-the-cleaner-smoother-loop-for-the-following-example
http://www.mathworks.com/matlabcentral/answers/178215-how-can-i-access-part-of-my-stucture-by-index
Example Code:
>> A(1).data = 4;
>> A(2).data = 5;
>> A(3).data = 6;
OR
>> A = struct('data',{4,5,6});
And then access the field of any element of the structure using indexing and the fieldname:
>> A(2).data
ans = 5
Which means you can get the sum of all of the elements using this simple code:
>> sum([A.data])
ans = 15

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回答（1 个）

Image Analyst
Image Analyst 2015-11-17
Just use the debugger and find out where the earlier fields disappear. For example, so you have all 30 fields just before the call to clearvars and only one, s30, after you call it? Or when you assign matrices.s2, does matrices.s1 vanish at that point? If you knew how to use the debugger, this could be very straightforward. http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

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