How to change name of factor levels?

Question

training set

trainSample <- cbind(data[1:980,1], data[1:980,2]) cl <-
factor(c(data[1:980,3]))

test set

Answer 1

You can do something like this:

x<-factor(c(1,1,2,3,1), labels=c("group1","group2","group3")) 
> x 
[1] group1 group1 group2 group3 group1 
Levels: group1 group2 group3

Or like this:

train <- read.csv("train.csv", header=TRUE)[1:1000, ]
labels <- train[,1]