using dataframe names in a loop in R

Question

I am using the following code to access data frames df1,df2 and df3 in a loop and rename them. This gives me an error. How do I tell R that its a data frame not a

for(i in c(df1,df2,df3)) {
  colnames(data.frame(i))=c("var1","var2","var3")
}

Create a list and use lapply to chnage names: lapply(list(df1, df2, df3), function(x) { names(x) <- paste0("var", 1:3); x }) — markus
– markus, Commented Mar 10, 2019 at 22:41
@markus or use setNames(x, paste0("var", 1:3)) and avoid returning object at end. — Parfait
– Parfait, Commented Mar 10, 2019 at 23:31
Thanks for the answer. Also, when my function is passing a string let's say "count" and I want to create multiple variables using it in the function, like a_count b_count c_count how do I proceed? — abhi
– abhi, Commented Mar 10, 2019 at 23:53
@abhi post another question whit an short example showing the problem — Robert
– Robert, Commented Mar 11, 2019 at 11:15

Robert · Accepted Answer · 2019-03-10 22:40:14Z

1

Try using a list instead

dfl=list(df1,df2,df3)
  for(i in 1:length(dfl)) {
    colnames(dfl[[i]])<-c("var1","var2","var3")
  }

answered Mar 10, 2019 at 22:40

Robert

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2 Comments

abhi Over a year ago

Thanks for the answer. Also, when my function is passing a string let's say "count" and I want to create multiple variables using it in the function, like a_count b_count c_count how do I proceed?

Gregor Thomas Over a year ago

Same answer: use a list instead. Reading this would probably be good for you.

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