Question

I need to replace integer variable to factor using this statement below I can accomplish my goal.

training$v1 <- factor(training$v1)

But I have 100 of these v1 to v100 : I’m trying to do the loop on this using this code .. but it gave me error.

for (i in 1:100) {
    training$vi <-factor(training$vi)
}

Any recommendation?

Thanks

Answer 1

You could try this inside the for loop

clm <- paste("v", i, sep = "")
training[, clm] <- factor(training[, clm]

or use column index instead. For instance, the columns you want to modify are from 2:101

for (i in 2:101) {
    training[, i] <- factor(training[, i])
}