CODEWITHSUNDEEP
r
Stataq
Stataq

Reputation: 2297

how to set a variable as factor in global environment

I have a list of dfs lst, and each df in lst have variable "ID". It is possible to set "ID" as a factor at once, in stead of set one by one?

Is this called setting up a variable in global environment? I might used the wrong term.

Upvotes: 1

Views: 87

Answers (2)

GuedesBF
GuedesBF

Reputation: 9858

You can also use the tidyverse:

library(purrr)
library(dplyr)

map(lst, ~.x%>%mutate(ID=as.factor(ID))

an example with the iris dataset:

#first transform the Species into a character variable:
iris<-iris%>%mutate(Species=as.character(Species))

#second, create an additional iris dataframe for the list
iris2<-iris
lst<-list(df1=iris, df2=iris2)

#Then call map with the mutating function:
map(lst, ~.x%>%mutate(Species=as.factor(Species)))

Upvotes: 2

akrun
akrun

Reputation: 887158

We can loop over the list with lapply, and transform

lst <- lapply(lst, transform, ID = factor(ID))

Or if we have an object with string 'ID' in the global env

v1 <- "ID"
lst <- lapply(lst, function(x) {
        x[[v1]] <- factor(x[[v1]])
        x})

Upvotes: 1

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