Two different ways to create a struct have 2 different results

Question

Vladimir 2013-8-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/85355-two-different-ways-to-create-a-struct-have-2-different-results

Although it's documented in the struct help, I'm curious if someone can explain the reasoning. There are 2 ways to create a struct, (1) dynamically adding fields and assigning their values and (2) using struct('field1', value1, 'field2', value2, ... ).

(1):

code.metaInfo = getEmptyMetaInfo();
code.dataValid = false;
code.dataCodewords = cell(MAXROWS, MAXCOLUMNS);

The above results in:

code =
         metaInfo: [1x1 struct]
        dataValid: 0
    dataCodewords: {90x30 cell}

(2):

code = struct('metaInfo', getEmptyMetaInfo(), 'dataValid', false, 'dataCodewords', cell(MAXROWS, MAXCOLUMNS));

But this results in...

code =
90x30 struct array with fields:
    metaInfo
    dataValid
    dataCodewords

I would expect the result to be exactly the same (before reading struct's documentation). Why aren't they?

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Answer 1

Iain 2013-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/85355-two-different-ways-to-create-a-struct-have-2-different-results#answer_94826

I think it may be because structs are an alternative to cells and the chap who wrote the function thought it might make be sensible to distribute out the contents of cell arrays in such a fashion.