Add attributes from one data frame to another

Add "map" attributes from df2 to df1.

add_attr(df1, df2)

Arguments

df1	Data frame to receive attributes.
df2	Data frame to give attributes.

Value

Data frame.

Examples

df1 <- data.frame(cars = 1:3)
df2 <- data.frame(cars = 1:3)
attr(df2$cars, "map") <- data.frame(levels = 1:3,
labels = c("Volvo", "Saab", "Opel"))
df1 <- add_attr(df1, df2)
df1$cars
#> [1] 1 2 3
#> attr(,"map")
#>   levels labels
#> 1      1  Volvo
#> 2      2   Saab
#> 3      3   Opel