Import numbers from header (.txt file)?

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MLP 2021-11-5

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https://ww2.mathworks.cn/matlabcentral/answers/1580104-import-numbers-from-header-txt-file

评论： MLP 2021-11-6

testMODEL.txt

Hello, I have set up a script that will go through many files containing 3D geometries and is essential that I am able to extract the number of vertices and faces listed in the header of each respective file. How can I access thiese numbers (lines 5 and 9 of the attached file) in order to assign them to a variable?

Thank you in advance!

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Walter Roberson 2021-11-5

Do you need only those things for a given pass, or will you happening to be reading the data in as well?

If you are reading in the data at the same time, then some of the convenient methods become worth doing, but if you have "many" files and you only need that header information, then the overhead of the convenient methods could be too much and you might need to switch to less convenient but faster methods.

MLP 2021-11-6

编辑：MLP 2021-11-6

I need those two numbers from the header but I also need to import the rest of the file. I am currently using readmatrix() for the later. @Walter Roberson

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Answer 1

Walter Roberson 2021-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/1580104-import-numbers-from-header-txt-file#answer_824919

在 MATLAB Online 中打开

filename = 'testMODEL.txt';
S = fileread(filename);
EV = cell2mat(textscan(S, 'element vertex %f', 1, 'HeaderLines', 4));
EF = cell2mat(textscan(S, 'element face %f', 1, 'HeaderLines', 8));
data = cell2mat(textscan(S, '%f %f %f', 'HeaderLines', 11));