[R] Converting a number column to a factor in a data frame?

[Andy Bunn]

Look at ?as.factor

HTH, Andy

## Example
# Make some data
foo.df <- data.frame(X1 = rnorm(10), X2 = runif(10), Y = round(runif(10)
+ 1))

# Summarize it
summary(foo.df)

# Tak an extra close look at column Y
class(foo.df$Y)

# Change Y to a factor
foo.df$Y <- as.factor(foo.df$Y)

# Look at it again
summary(foo.df)
class(foo.df$Y)
levels(foo.df$Y)