Listing mat files in a directory and checking to see if they have a particular file.

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William
William 2011-10-27
评论： Walter Roberson 2021-3-24
Greetings I have been having a tough time creating a list of files (.mat files) in a directory in a listbox, and then checking to see if they contain a certain variable. I tried using uigetfile() but that hasn't panned out very well.
How do I get a list of files in a directory no matter what type they are and run a test on them to see if they contain a certain variable?
Thank you
Bill

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-10-27
Files=dir(fullfile('MyFolder','*.mat')) will give you a list of .mat files.
Files=dir(fullfile('MyFolder','*.*')) will give you a list of all files and subfolders.
Files is a structure array, check its fieldnames.
Vars=load('MyData.mat') will return Vars as a structure. fieldnames(Vars) gives you all the variable names in the .mat file.
  1 个评论
Louis-Philippe Guinard
Louis-Philippe Guinard 2021-3-23
Hello!
Waaaaay late to the party, but if by any chance someone needs this and finds the same error as me (I'm using 2018a BTW) I tried the first line that was suggested, I.E.:
Files = dir(fullfile(MyFolder, '*.mat'));
Fangjun has written the MyFolder between quotes (as in, 'MyFolder' ) but this returned me a 0x1 structure while it should have been a 30x1 structure in my case. The quotes made it so it searched for a folder named MyFolder, while I was already specifying a path prior to this. It then depends if MyFolder is a string name or a variable.
Hope this precision helps! :)

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更多回答（2 个）

Walter Roberson
Walter Roberson 2011-10-27
hasvar = false;
try
s = whos('VariableYouWant', '-file', TheFileLocation);
if ~isempty(s); hasvar = true; end
catch
end
  2 个评论
K E
K E 2012-7-20
To search recursively for all files with a mat extension in order to subsequently apply Walter's solution, use getfilenames.m . Just mentioning this in case someone else wants to perform a recursive search for all mat files containing a desired variable.
Walter Roberson
Walter Roberson 2021-3-24
A few years after the above comment from K E, MATLAB added the ability to search indefinite number of layers down:
dinfo = dir(fullfile(BaseFolder, '**', '*.mat'));
filenames = fullfile({dinfo.folder}, {dinfo.name});
The folder field returned by dir() was added at the same time,

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William
William 2011-10-27
You guys are Awesome. One last thing. How do I specify the file location from within the Gui. I would like the user to be able to choose. Can I just use UIgetfile()?
Thanks
  2 个评论
Walter Roberson
Walter Roberson 2011-10-27
uigetfile() if you want to choose which individual file to examine for the variable; uigetdir() if you want to choose which directory to examine. You would use uigetdir() together with dir() in order to examine all files in the chosen directory.

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