How can I list only the data frame objects in R?

Question

Is there a way to list objects based on their classes ? For example, list only the dataframe objects in the workspace.

Check [this post](http://stackoverflow.com/questions/35371882/how-can-i-access-all-objects-of-class-data-frame-inside-globalenv-in-r) — talat, Jul 15 '16 at 12:49
@docendodiscimus Thanks for the link. I liked the `dflist <- Filter(is.data.frame, as.list(.GlobalEnv))` solution . — Veera, Jul 15 '16 at 12:58

score 4 · Answer 1 · answered Jul 15 '16 at 12:53

4

Here is a way with sapply and class to retrieve the names of the objects in the environment that are data.frames:

ls()[sapply(ls(), function(i) class(get(i))) == "data.frame"]

answered Jul 15 '16 at 12:53

lmo

Why are you complicating this? Use this `ls()[sapply(ls(),function(t) is.data.frame(get(t)))]` – user2100721 Jul 15 '16 at 12:54
That would return something different than what I said. That would be a logical vector. I am returning the names of the objects. I'm not sure that your statement is that much cleaner than mine. – lmo Jul 15 '16 at 12:57
1

The exact code is already there in the dupe post which was dupe tagged 4 mins before this was posted. – akrun Jul 15 '16 at 12:57
@user2100721 Sorry for the confusion. It was the other way around. Thanks for asking. To be clear, `ls()[sapply(ls(), function(i) class(get(i))) == "data.frame"]` didn't list the data table objects (which are dataframes too) but `ls()[sapply(ls(),function(t) is.data.frame(get(t)))]` listed all dataframes. – Veera Jul 15 '16 at 13:17

score 0 · Answer 2 · answered Jul 15 '16 at 12:52

0

for (obj in ls()) { 
    if(class(get(obj)) == "data.frame")
       print(obj)
}

answered Jul 15 '16 at 12:52

Ronak Shah

2 Answers2