find if the variable exists in a given cell-structure

Question

Megha 2018-8-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/415067-find-if-the-variable-exists-in-a-given-cell-structure

编辑： Stephen23 2018-8-16

I have structure-data within a cell. Now I would like to check the condition in each cell if the particular variable exists or not?

So, i tried something like,

str = (['data{1,' num2str(i) '}.m_PA_in_out1']);
if exist(str,'var')==1 
    disp('>>>> YES')
else
    disp('no variable')
end

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Stephen23 2018-8-16

编辑：Stephen23 2018-8-16

"Now I would like to check the condition in each cell if the particular variable exists or not?"

Neither cells nor structures contain "variables", although tables do use this nomenclature. Structures have fields. Are you actually trying to test if the structure contains a particular field ? I.e. to check if the structure in data{...} contains the field m_PA_in_out1 ?

https://www.mathworks.com/help/matlab/structures.html

Note that if all structures have the same fields then you would be better off using a non-scalar structure:

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

As I wrote in my comment to your earlier question, the approach you are using is going to be slow, complex, and buggy (exactly as you are finding out).

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