Use a string as a struct name

Question

Ulrik William Nash 2019-11-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/490251-use-a-string-as-a-struct-name

回答： Walter Roberson 2019-11-10

In different files, I have a struct. Each struct has the same underlying structure and variable names. But the name of each struct is different, yet predicable by the filename

I want to programatically load the files (no problem), create a string from information in the filename (no problem), and then use this string as the structname. For example (getting data in the matrix 'age'):

filename = 'output_setting1.mat'

structname = 'setting1'

data = setting1.age

How can I convert structname = 'setting1' so I can use it as shown in the last line?

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Answer 1

Walter Roberson 2019-11-10

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/490251-use-a-string-as-a-struct-name#answer_400708

在 MATLAB Online 中打开

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

filename = 'output_setting1.mat';
file_struct = load(filename);
fn = fieldnames(file_struct);
data_struct = file_struct.(fn{1});
data = data_struct.age;

No need to dynamically create the name of a variable: you can create the name of a field instead.