variable problem

[Izabela]

Hi , I want to use variable name (string variable) after $ to extract data from dataset, like below. I don't even know if it's possible. Is it possible or can I change something to do this?

var_name <-  'name'
data$var_name

[jrkrideau]

You can do something like this

xx <- "wday"

dd <- paste0("dat1$",xx)

[nirgrahamuk]

var_name <-  'name'
data[[var_name]]

[HanOostdijk]

@nirgrahamuk beat me again. My example was supposed to be:

df1 <- data.frame(
  name=c("john","mary"),
  age= c(8,9)
)

var_name <-  'name'
df1$var_name # will not work as expected: no var_name column in df1
#> NULL
str(df1[var_name])
#> 'data.frame':    2 obs. of  1 variable:
#>  $ name: chr  "john" "mary"
str(df1[[var_name]])
#>  chr [1:2] "john" "mary"
Created on 2023-03-10 with reprex v2.0.2

[Izabela]

Thank you very much. I use your solution. It works!