Retrieve data from several structures and folders

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Isma_gp 2019-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/438595-retrieve-data-from-several-structures-and-folders

编辑： Stephen23 2019-1-8

Hi, I need to extract information from several structures organized in different folders.

The data is organized in folders.

The folders are folder_1, folder_2.....folder_n. Each folder contains a structure called moo_data. Each structure contains several structures (file_1, file_2, file_3...etc). The number of structures within each moo_data structure could be different on each folder.

Each of these structures contains a double (24x20) called response that I need to extract.

I would like to structure the extracted data in the following manner:

Newstructure.folder_1.response

Newstructure.folder_2.response

Can I get some help?

Thanks

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Stephen23 2019-1-7

编辑：Stephen23 2019-1-8

This is a continuation of this question:

https://www.mathworks.com/matlabcentral/answers/436009-retrieve-data-from-several-folders-and-structures

@Isma_gp: Use a non-scalar structure:

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

Then you can use much simpler and more effiicient indexing, rather than messing about with generating fieldnames. You have already been shown how to use non-scalar structures:

https://www.mathworks.com/matlabcentral/answers/417791-for-loop-with-file-number

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Answer 1

Bob Thompson 2019-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/438595-retrieve-data-from-several-structures-and-folders#answer_355361

If I'm understanding this correctly, you're looking to dynamically change the variable you're using each time you go through the for loop? I don't know that it's possible to do this directly, and it's generally considered bad practice within MATLAB. I would suggest that you change the layout of your structure to contain a single generic name, and an index.

Newstructure.folder(1).response = ...

This will make looping much more simple, as adjusting an index is much easier within a MATLAB loop.

I think a better option though, assuming all of your files are named the same, would be to use a recursive file locator with the dir() command.

If you are using 2016b or newer, then this can be done using the dir command directly:

filelist = dir(['parent_directory','**','response']);

I'm not absolutely certain that is the exact format, but you can look it up fairly easily with a google search.

If you are not using 2016b or newer, then the file exchange has several recursive file searching codes. Personally, I have used this one, and found it to be adequate for locating files.