loop through files in struct

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Anna Go 2019-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/468586-loop-through-files-in-struct

编辑： Bob Thompson 2019-6-24

采纳的回答： Bob Thompson

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Hi everyone, I have a struct class where the files in the struct are called:

Vabc_1, Vabc_2, ...., Vabc_900

I wanted to loop through the structure and execute a command (take the information out of a struct element nad put it into a seperte table/array)

my idea was do do something like this. However I can't use a variable to call a file in the struct element.

for i = 1:length(busV)

for i = 1:length(structData)
    chosenFile = 'Vabc_' + string(i) %This is the piece of code I am struggeling with
    
    newTable(:,i) = structData.chosenFile.(i)
    
end

thanks for your help!

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Answer 1

Bob Thompson 2019-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/468586-loop-through-files-in-struct#answer_380520

I'm going to assume that your structure already has a variable that contains the file name, and you are just trying to reference it. With a multidimensional structure that type of call should be something like this.

for i = 1:length(structData)
    filename = structData(i).file;
end

.file is a generic reference, something that I made up because I don't know what you have called it in your code. You will need to change this for it to be workable.

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Anna Go 2019-6-24

Hi Bob,

thanks for your quick reply. That would work if the files would be already sorted. But they are randomly organised.Sorry I had to explain it better.

I can't attach the whole file but I have a screenshot below. They are not organised in the order I want them to be in the new table. So basically I want Vabe_1 next to Vabc_2, etc. It goes up to Vabc_906.

thanks!

Bob Thompson 2019-6-24

编辑：Bob Thompson 2019-6-24

Ok, so you actually need to sort the values first. There are a couple of options for how to do this.

First, you can try sorting the rows based on the file name. I'm not sure if it will sort correctly because I don't remember exactly how Matlab treats integers in a string. Add this before your loop.

structData = sortrows(structData,'filenamefield');

Ideally that will sort the structure elements based on the filename field into ascending order. If it does not then it will likely give you the exact same value as an output. If this is the case then try the second method.

The second method is to create the ideal string, as you had already (chosenfile should be fine, I think), and then to use logic indexing to call the proper field.

for i = lenght(structData)
    chosenFile = 'Vabc_' + string(i);
    stuff = structData([structData.filenamefield] == chosenFile).fieldIwant;
end

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