I have a df :
v1 <- c(100, 20, 5, 30)
v2 <- c(10, 13, 2, 30)
v3 <- c(10, 200, 5, 300)
df <- data.frame(v1, v2, v3)
v1 v2 v3
1 100 10 10
2 20 13 200
3 5 2 5
4 30 30 300
I don't want to use a column name directly with dplyr but refer to a column name stored in a variable (o that I can change it easily throughout a program. This variable is called column_used. in my example, column_used is v1.
column_used <- "v1"
I want to use this variable mut it is not working :
df %>%
mutate(taux = (column_used/ 100))
column_used is only a string and you need to convert it to symbol (i.e. to say that it's not a string, but it's a variable/column name).
You can achieve this e.g. by using get() from base or as.name() or sym() with !! operator from rlang:
# get()
df %>%
mutate(taux = get(column_used) / 100)
# !!as.name()
df %>%
mutate(taux = !!as.name(column_used) / 100)
# !!sym()
df %>%
mutate(taux = !!sym(column_used) / 100)
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