R: List Variables
# Without sorting:
head(theDataframe[,c("theVariable1","theVariable2")], n = 20)
# With sorting by one variable:
head(theDataframe[order(theDataframe$theVariable1),c("theVariable1","theVariable2")], n = 20)
# With sorting by two variables:
head(theDataframe[order(theDataframe$theVariable1,theDataframe$theVariable2),c("theVariable1","theVariable2")], n = 20)