The error message is helpful because it indicates the problem has to do with identifying filenames by their string pattern (pattern = pattern). To fix, the second pattern can be changed to "inflammation.*csv" (pattern = "inflammation.*csv").
I am planning to do a pull-request for episode 5 after my demo this Thursday so I will add this to that. If I am wrong about my understanding of the episode, please let me know.
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I am new to doing the pull requests and have just completed my first (about the command line program location for saving/storing scripts). I am waiting to begin a pull request here to see how the first request is resolved. If it is possible I would also like to know if anyone else had a problem with the analyze_all function. I had to change (pattern = pattern) to (pattern - inflammation.*csv) for it to work. But it seems strange that it has not been fixed before now, since it is an important function that is used over and over again in the lesson.