R help - Feb 2004 - Converting a number column to a factor in a data frame?

Is there an easy way of taking a dataframe which is comprised of only
numbers, and converting one of the integer columns to a factor column?  How
do I go about this?

--j

-- 
Jonathan Greenberg
Graduate Group in Ecology, U.C. Davis
http://www.cstars.ucdavis.edu/~jongreen
http://www.cstars.ucdavis.edu
AIM: jgrn307 or jgrn3007
MSN: jgrn307 at msn.com or jgrn3007 at msn.com

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)