Refer to structure names

Question

Joanna Przeworska 2021-3-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787834-refer-to-structure-names

评论： Joanna Przeworska 2021-4-1

Hi,

Suppose I have a structure A with a, b, c, d tables inside. My aim is to use names of tables within structure A (a, b, c, d) to create new tables in structure B. I tied to do this in the following way, however it does not work. Any ideas how to corect it?

B.(fieldnames(A)'){1} = table1
B.(fieldnames(A)'){2} = table2
....

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Answer 1

Stephen23 2021-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/787834-refer-to-structure-names#answer_662389

编辑：Stephen23 2021-3-30

在 MATLAB Online 中打开

F = fieldnames(A);
B.(F{1}) = table1
B.(F{2}) = table2

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

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Stephen23 2021-4-1

编辑：Stephen23 2021-4-1

"Could you explain why it is not recommended?"

Because it is more complex. More complex code is more difficult to understand, more difficult to maintain, obfuscates the code intent, is more liable to bugs, and is more difficult to debug. It is also likely to be less efficient, as it requires multiple calls to fieldnames.

Joanna Przeworska 2021-4-1

I see your point. Thank you for your help and clarifications.

Best regards, JP

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Answer 2

Matt J 2021-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/787834-refer-to-structure-names#answer_662489

在 MATLAB Online 中打开

args = [fieldnames(A).'; {table1, table2, table3,...}]
    
B=struct(args{:})

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Joanna Przeworska 2021-3-31

Dear Matt,

Thank you for your response, whowever this is not exactly what I wanted to receive.

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Answer 3

Image Analyst 2021-3-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787834-refer-to-structure-names#answer_662544

在 MATLAB Online 中打开

"Suppose I have a structure A with a, b, c, d tables inside. My aim is to use names of tables within structure A (a, b, c, d) to create new tables in structure B."

So, why does this not work?

B = A;

New structure B will have all the same fields (a, b, c, and d) as existing structure A with the same names. Each field in the structure will have the same table as in A, which is what it seemed like you were trying to do when you assigned the tables. This also means that all the columns names of the tables of structure B will match the column names from the tables of structure A.

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Joanna Przeworska 2021-3-31

In my exercise, my goal is to dynamically refer to the field names of structure A in order to store the calculation in a different structure B, but with a name taken from structure A.

I don't know if I made it clear what I mean.

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