Importing and naming files in a loop

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sarah Abdellahi 2018-9-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420713-importing-and-naming-files-in-a-loop

评论： Stephen23 2018-9-25

Friends :)

I want to import several files sequentially. In each step, I want the required data to be extracted and then stored in a variable. I have problem storing the data I know its a wrong way to write it, but to explain what I mean, here is how I would like them to load in matlab. Thank you

    for i=1:65
    load(['DATA_' num2str(i) '.mat'])
    Test(i)_1L=(((cDA_1L_WS.DATA.*1000)-4)/0.2133.*3.6/1.608);
    Test(i)_2L=(((cDA_2L_WS.DATA.*1000)-4)/0.2133.*3.6/1.608);
    end
In other words, my output vectors would be like: 
Test1_1L, Test1_2L, Test2_1L,Test2_2L, Test3_1L ,Test3_2L ...

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Stephen23 2018-9-25

As Fangjun Jiang wrote, magically changing variable names like that not recommended. Dynamically creating or accessing variable names is one way that beginners force themselves into writing slow, complex, buggy code that is hard to debug. Read this to know why:

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

You should use neat, simple, and very efficient indexing, exactly as Fangjun Jiang showed.

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Answer 1

Fangjun Jiang 2018-9-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420713-importing-and-naming-files-in-a-loop#answer_338380

Without more details, the first thing to correct is the variable name

Test(i)_1L should be Test_1L(i)

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sarah Abdellahi 2018-9-25

Thank you for your response.

I think I am not clear enough. "1L" is measured in several tests. I want to extract all "1L" and store them based on their associated test number. If I am not wrong, what you suggested updates L not test number in each iteration.