How do I import multiple files from a folder in MATLAB?

2013 6 10
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I want to open all the files with a certain attribute (e.g. they all have 'History' in their name) and open them, one by one, in MATLAB. I know of the command dir my_name.txt which will list it like I want, but how do I now open the files that it listed?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-6-10
how do you want to open those files?
Samyukta Ramnath
Samyukta Ramnath 2013-6-10
I need to open them as in fopen The code that I tried was
if true
% code
matfiles = dir(fullfile('E:\MachineLearning\TestFiles\*.txt'));
data = cell(4,100);
for i = 3 : 7
fid = fopen(matfiles(i).name);
data{i} = fscanf(fid,'%c');
end
end
This worked but I need to know how to open only the files with a certain something in their name. For example open all files with '.txt' in the name. That is, open all text files only.

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Walter Roberson
Walter Roberson 2013-6-10
编辑：Walter Roberson 2013-6-10

3 个投票

Remember to fclose(fid) after you do the fscanf()
The code you show will already only locate file names ending in .txt .
You should be more careful with directories, though:
testfiledir = 'E:\MachineLearning\TestFiles\';
matfiles = dir(fullfile(testfiledir, '*.txt'));
nfiles = length(matfiles);
data = cell(nfiles);
for i = 1 : nfiles
fid = fopen( fullfile(testfiledir, matfiles(i).name) );
data{i} = fscanf(fid,'%c');
fclose(fid);
end

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Samyukta Ramnath
Samyukta Ramnath 2013-6-10
Ah yes, I could make the computer lose a lot of memory without fclosing! Thank you!
Walter Roberson
Walter Roberson 2013-6-10
It would probably run out of file descriptors before it ran out of memory.

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