cell2struc "Number of field names must match number of fields in new structure" error

Question

Ashley Lewis 2018-8-8

0
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https://ww2.mathworks.cn/matlabcentral/answers/414090-cell2struc-number-of-field-names-must-match-number-of-fields-in-new-structure-error

回答： Kaitlyn Keil 2018-8-8

Hello! I am trying to assign 3 fields to each image of this cell array when I convert it to a structure array. I think the error is occurring since the cell array is 16x1 and therefore expects 1 field along the 2nd dimension. However I am looking to assign three fields for each image (therefore each cell) in the array. How can I change my code to do this? Thanks for any help!

 N = 16;
C = cell(1,N);
for k = 1:N
    F = sprintf('image%d.bmp',k);
    C{k} = imread(F);
    C_transposed = C'; 
end
fields= {'image',[], 'category','', 'Label', ''};
GImageDataManMade = cell2struct(C_transposed, fields,2)

error: Error using cell2struct Number of field names must match number of fields in new structure.

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Answer 1

Kaitlyn Keil 2018-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/414090-cell2struc-number-of-field-names-must-match-number-of-fields-in-new-structure-error#answer_332052

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I believe what you want to do is the following:

N = 16;
C = cell(3,N);
for k = 1:N
    F = sprintf('image%d.bmp',k);
    C{1,k} = imread(F);
    C_transposed = C'; 
end
fields= {'image','category', 'Label'};
GImageDataManMade = cell2struct(C_transposed, fields,2)

and then set the category and Label separately (or during the loop). Before, it was trying to shape a 16x1 cell array into a structure that wanted 16x6 (the '[]' and '' in fields counted as new fields as well), as you suspected.