I have this example where I wish to create the column m where if x1 or x2 or x3 = "A" or "B" then m = 1, otherwise m = 0
df <- data.frame(x1 = LETTERS[1:10], x2 = LETTERS[2:11], x3 = LETTERS[3:12])
df <- df%>%
mutate(m = ifelse(df[,paste0("x",1:3)] %in% c("A","B") ,1,0))
when using this code it is not working and I don't know where the bug is and how to fix it. Thanks.
You can use rowSums. Better use grep instead of the paste approach.
> df |>
+ transform(m=+(rowSums(sapply(df[grep('^x\\d$', names(df))], `%in%`, c('A', 'B'))) > 0))
x1 x2 x3 m
1 A B C 1
2 B C D 1
3 C D E 0
4 D E F 0
5 E F G 0
6 F G H 0
7 G H I 0
8 H I J 0
9 I J K 0
10 J K L 0
dplyr::mutate should also work, haven't installed it. Avoid ifelse or the like whenever possible, it's just slow.