CODEWITHSUNDEEP
rlistnaming
Joschi
Joschi

Reputation: 3039

Use object names as list names in R

Of course I could name the objects in my list all manually like this:

    #create dfs
    df1<-data.frame(a=sample(1:50,10),b=sample(1:50,10),c=sample(1:50,10))
    df2<-data.frame(a=sample(1:50,9),b=sample(1:50,9),c=sample(1:50,9))
    df3<-data.frame(a=sample(1:50,8),b=sample(1:50,8),c=sample(1:50,8))

    #make them a list
    list.1<-list(df1=df1,df2=df2,df3=df3)

But it makes a lot of work if I have let's say 50 objects with long names. So is there any way to automate this and make the names inside the list the same as the outside objects?

Upvotes: 13

Views: 4562

Answers (3)

Scott Kaiser
Scott Kaiser

Reputation: 317

As noted in the possible duplicate questions' responses:

From the tidyverse, use tibble:lst: https://tibble.tidyverse.org/reference/lst.html

Upvotes: 1

Brandon Bertelsen
Brandon Bertelsen

Reputation: 44708

If you just want to name a list with names from the environment that share something, in this case 'df': 

names(list.1) <- grep("df",ls(),value=TRUE)

If you want to push your environment into a list: 

list.1 <- globalenv()
list.1 <- as.list(list.1)

To reverse the process see ?list2env

Upvotes: 3

Richie Cotton
Richie Cotton

Reputation: 121177

Find the names, then call mget.
If there is a pattern to the names of each individual variable, then this is straightforward.

var_names <- paste0("df", 1:3)
mget(var_names, envir = globalenv())  #or maybe envir = parent.frame()

If the naming system is more complicated, you can use regular expressions to find them, using something like

var_names <- ls(envir = globalenv(), pattern = "^df[[:digit:]]+$")

Upvotes: 9

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