Dear colleagues,

I would like to figure out how to use loops to work with dataframes.

The specific task for example is this: I have, lets say, 9 dataframes and I want to apply the mutate function to all of them, that is, add a column and save the result in the same dataframes. What am I doing:

I already have dataframes in my environment

Then to go through them I create a list from them:

dflist <- list(m1, m12, m13, m14, m2, m3, m5, m6, m7)

then I do this loop:

for (i in 1:length(dflist)){
  dflist[[i]] <- dflist[[i]] %>% 
    mutate(symbol = rownames(.))
}

For some reason, the dataframes change only inside the list that I created, but the dataframes themselves that I had do not change. I understand that I have to use paste somehow, but I don’t know how. Please tell me how to write the results from the cycle into dataframes, maybe I should access dataframes inside the cycle in a different way? I would be grateful if you could help me understand how to do this both through the for loop and through lapply function.