这是我将如何做的更详细的说明。
library(car) #* contains the recode function
#* Construct a sample data set
DFrame <- lapply(1:10,
function(i) sample(1:5, 15, replace = TRUE))
DFrame <- as.data.frame(DFrame)
set.seed(pi)
DFrame$id = LETTERS[1:15]
DFrame <- DFrame[, c(11, 1:10)]
names(DFrame)[-1] <- paste0("Var", 1:10)
DFrame
#* Identify variables that need to be recoded.
#* Searches for any variable that has only values in 1:5
var_to_reverse <-
vapply(DFrame,
function(x) all(x %in% 1:5),
logical(1))
#* In your case, I think recode is a bit of overkill
#* Here's how to do it with 6 - x
DFrame2 <- DFrame
DFrame2[, var_to_reverse] <-
lapply(DFrame2[, var_to_reverse, drop = FALSE],
function(x) 6 - x)
#* Here's how to do it with recode, if you have a more complex situation.
DFrame3 <- DFrame
DFrame3[, var_to_reverse] <-
lapply(DFrame3[, var_to_reverse, drop = FALSE],
recode,
recodes = "5=1; 4=2;3=3;2=4; 1=5")
#* confirm that both methods provide the same result.
identical(DFrame2, DFrame3)