How can I make a list of all dataframes that are in my global environment?

Question

I am trying to use rbind on them. But I need a list of all the dataframes that are already in my global environment. How can I do it?

Code I used to import the 20 csv files in a directory. Basically, have to combine into a single dataframe.

temp = list.files(pattern = "*.csv")
for (i in 1:length(temp)) assign(temp[i], read.csv(temp[i]))

Answer 1

This function should return a proper list with all the data.frames as elements

dfs <- Filter(function(x) is(x, "data.frame"), mget(ls()))

then you can rbind them with

do.call(rbind, dfs)

Of course it's awfully silly to have a bunch of data.frames lying around that are so related that you want to rbind them. It sounds like they probably should have been in a list in the first place.

I recommend you say away from assign(), that's always a sign things are probably afoul. Try

temp <- list.files(pattern="*.csv")
dfs <- lapply(temp, read.csv)

that should return a list straight away.

Answer 2

From your posted code, I would recommend you start a new R session, and read the files in again with the following code

do.call(rbind, lapply(list.files(pattern = ".csv"), read.csv))