How to find the name of the first filed of a struct?

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Zeynab Mousavikhamene 2020-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/504433-how-to-find-the-name-of-the-first-filed-of-a-struct

编辑： dpb 2020-2-9

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I have a structre which has some fields. How can I find the field name of the first field?

Here is the struct I have:

  struct with fields:
                   unpatterned_H_65_full: [17×34 table]
                  unpatterned_H_100_full: [17×34 table]
              unpatterned_H_100_ribboned: [17×34 table]
    unpatterned_H_100_ribboned_sectioned: [17×34 table]
              unpatterned_H_65_sectioned: [17×34 table]
             unpatterned_He_100_sectioned: [17×34 table]

I need to write a code that returns say " unpatterned_H_65_full".

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Answer 1

dpb 2020-2-9

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If the struct variable is s, then

name=fieldnames(s);
name=name(1);

No way to write the second-level addressing w/o the intermediary/temporary variable comes to me for a one-liner.

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Walter Roberson 2020-2-9

Having names around permits you to examine additional fields less expensively.

In any case fieldnames returns a cell array of character vectors and indexing it with (1) would return a scalar cell instead of the character vector

dpb 2020-2-9

编辑：dpb 2020-2-9

Yes, if there were to be a need for other fields besides the stated need for only the first
Yes, but cellstr is oftentimes more convenient than char string--but, sometimes it isn't...OP didn't give any context to know how the result was/is to be used. :)

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