read data from variables with names matching patterns

Question

Roy Goodman 2014-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/136705-read-data-from-variables-with-names-matching-patterns

回答： Jos (10584) 2014-6-20

A student of mine saved a .mat file containing variables named x1, x2, ..., x50, y1, y2, etc. How can I write program that will open the .mat file, and loop through each of these pairs of data. Somehow it involves "who" but I'm not seeing how to make it work.

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Roy Goodman 2014-6-20

answer to my own question: use the "eval" command.

dpb 2014-6-20

The better answer is to teach the student "don't do that" --

http://matlab.wikia.com/wiki/FAQ#Why_is_it_advised_to_avoid_using_the_.22eval.22_function.3F

http://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

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Answer 1

Jos (10584) 2014-6-20

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/136705-read-data-from-variables-with-names-matching-patterns#answer_141836

在 MATLAB Online 中打开

X = load('StudentsMatfile.mat') ;
LABELS = fieldnames(X) ;
N = numel(LABELS)
DATA = cell(N,1)
for k=1:N
   DATA{k} = X.(LABELS{k}) ;
end
save ('SupervisorMatfile.mat', 'DATA','LABELS') ;