how to extract all variables from a struct

Question

Rajesh 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474103-how-to-extract-all-variables-from-a-struct

回答： Rajesh 2019-7-30

Hi, I wanted to extract all the variables from the struct without having to manually type the headers. In short I want to dissolve the entire struct to differnt variables with their individual header names as the variable name.

Many thanks in Advance

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Stephen23 2019-7-30

Simple:

https://www.mathworks.com/matlabcentral/fileexchange/26216-structure-fields-to-variables

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Answer 1

Andrei Bobrov 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474103-how-to-extract-all-variables-from-a-struct#answer_385452

在 MATLAB Online 中打开

T = struct2table(data_table);

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Stephen23 2019-7-30

+1 excellent idea.

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Answer 2

Peter Jarosi 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474103-how-to-extract-all-variables-from-a-struct#answer_385451

编辑：Peter Jarosi 2019-7-30

在 MATLAB Online 中打开

I agree with Stephen but if you want a quick solution using an ugly trick:

v = fieldnames(data_table);
for x = 1 : length(v)
    myVar = data_table.(v{x})
end

or a little bit less ugly:

for v = fieldnames(data_table)
    myVar = data_table.(v{1})
end

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Peter Jarosi 2019-7-30

@Stephen Cobeldick : Never mind! Everybody wants to learn from her/his own mistakes. :-)

Peter Jarosi 2019-7-30

@Stephen Cobeldick : Thank you for the anti-pattern link!

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Answer 3

Rajesh 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474103-how-to-extract-all-variables-from-a-struct#answer_385462

编辑：Rajesh 2019-7-30

a=fieldnames(data_table);

data_table=table2array(data_table);

for k=1:length(data_table(1,:))

eval([a{k} '=data_table(:,k);'])

end

thank you for all the replies...this worked for me.. but i had to use eval...

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Stephen23 2019-7-30

编辑：Stephen23 2019-7-30

"i had to use eval"

I doubt that you "had to use eval". I have written thousands of lines of code and imported thousands of data files of many different formats, and yet I have never needed to use eval.

You just designed your code (or data) badly, such that you force yourself into writing slow, buggy, complex, obfuscated code that is hard to debug:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Jan 2019-7-30

Using eval is indeed a very bad idea.

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Answer 4

Rajesh 2019-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/474103-how-to-extract-all-variables-from-a-struct#answer_385472

@Peter Jarosi

@Stephen Cobeldick

thank you for all the good advices.

I needed this code for extracting a large number of test data files, which are proccessed by another tool, and fiinally i get the values as a struct. So as a quick solution just to get the variable output which will be an input to my system model (thermal system).. i have used 'Eval'..

But when i am going to create a tool to automate all these post processing, I will keep in mind to work around 'Eval,

Thanks Again for all the suggestions.