[R] change the class of an object within with()

From: François MICHONNEAU <francois.michonneau_at_gmail.com>
Date: Tue 27 Jun 2006 - 19:54:22 EST


Can anyone explain me what is wrong in the following code? and in particular why it is not possible to change the class of an object thanks to the function with(). Does an alternative exist?

xxx <- data.frame(x = c("a","b","c","d","e"), y = c("1","2","3","4","5")) str(xxx)
with(xxx, {

	x <- as.character(x)
	y <- as.numeric(y)

str(xxx) #no effect on the class of x and y

xxx$x <- as.character(xxx$x)
xxx$y <- as.numeric(xxx$y)


François Michonnneau

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