reading text files based on specific sub-string values.

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Ioannis Matthaiou 2021-7-14

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评论： dpb 2021-7-14

Hello,

I have several text files with the following format: "mmAAnn.txt". I read all the file names in Matlab without a problem. Now, I want to read each text file separately based on the value of "nn" within that filename's string. For instance, I want to decide to read and write in a variable only those filenames with nn=03. How do I do that?

Thank you,

Yiannis

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Answer 1

dpb 2021-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/878328-reading-text-files-based-on-specific-sub-string-values#answer_746638

在 MATLAB Online 中打开

nWant=3;
wildCardName=sprintf('*%02d*.txt',nWant);
d=dir(wildCardName);

Unfortunately, the MATLAB implementation of dir() only recognizes the asterisk as the wildcard symbol; if need more finesse than it either use regular expressions over the collection of names returned with more general form as above or I often will use the OS more powerful facility instead.