Testing for a string in a cell array in a structure

Question

dormant 2022-3-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1674944-testing-for-a-string-in-a-cell-array-in-a-structure

评论： Voss 2022-3-22

采纳的回答： Voss

I want to find the matches to a string in a cell array of strings which is part of a structure.

Strcmp works when I give it the cell array, but not when I use the structure.

>> CellArray = { 'one' 'two' 'three' 'one' };

>> S = struct( 'CA', CellArray );

>> strcmp( CellArray, 'one' )

ans =

1×4 logical array

1 0 0 1

>> strcmp( S.CA, 'one' )

Error using strcmp

Too many input arguments.

>>

What am I doing wrong?

I don't have to use a structure - I just use it as a way of returing lots of variables from a function.

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Answer 1

Voss 2022-3-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1674944-testing-for-a-string-in-a-cell-array-in-a-structure#answer_921219

编辑：Voss 2022-3-18

在 MATLAB Online 中打开

Enclose cell array arguments in the call to struct() with {} to make them scalar cell arrays, because struct() will create an array of structs for cell array inputs, one per element of the cell array given.

CellArray = { 'one' 'two' 'three' 'one' };
S = struct( 'CA', CellArray ) % 1-by-4 struct array
S = 1×4 struct array with fields:
    CA
S = struct( 'CA', {CellArray} ) % scalar struct
S = struct with fields:
    CA: {'one'  'two'  'three'  'one'}
strcmp( CellArray, 'one' )
ans = 1×4 logical array
   1   0   0   1
strcmp( S.CA, 'one' )
ans = 1×4 logical array
   1   0   0   1

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dormant 2022-3-22

Many thanks. Cell arrays are my Kryptonite!

Voss 2022-3-22

You're welcome! If it's working now, do you mind marking the answer as 'Accepted'? I appreciate it!

Honestly, the behavior of struct() you ran into here - where passing a cell array to the struct() function creates an array of structs rather than a scalar struct with a cell array field - is one thing that bugs me about MATLAB (and there aren't very many things that bug me about MATLAB).

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