MATLAB: How to know which file identifiers correspond to open files

Question

I have opened a file using FOPEN and processed it. A few lines of code later, there was an error, and the file wasn't closed properly.

I would like to know which file identifiers correspond to open files so I can close them using FCLOSE.

Answer 1

To see the list of identifiers of all open files you can use the following command:

fids = fopen('all')

To see the file names which correspond to those file identifiers you can use the following command:

filenames = arrayfun(@fopen, fids, 'UniformOutput', 0)

Finally, if you just want to close all open files you can use the following command:

fclose('all')