Hi again Rui, I tested your script as you wrote it with my examples, it works perfectly! It seems to be exactly what I'm trying to do. I just have a question about your function na.fill. When I'm trying to apply your script to my data, it doesn't work. I think it's because in your example, you already open the data.frames in your list. But in my case, these data.frames are in different files (as I have 70 files). I'm trying to apply your function na.fill on a list.files. That's why I think it tells me: "Error dans x$data : $ operator is invalid for atomic vectors" I tried like this: x[,2] but it doesn't work too: "incorrect number of dimensions". How can I do exactly the same for na.fill, but by calling a file (according to the name of the file) and not directly a data.frame like you (s1,s2,s3)?
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