Sorry, I should have written it an other way:
test$z <- test[[2]]/test[[3]]
Which is then really easy to fit into a for loop
Ivan
Le 5/28/2010 14:05, Ivan Calandra a écrit :
Hi,
Would this do:
test <- data.frame(a=LETTERS[1:10], x=1:10, y=seq(0.1,1,0.1)) #create
some data.frame
test$z <- test$x/test$y #add a column
?
HTH,
Ivan
Le 5/28/2010 13:52, Andre Easom a écrit :
Hi,
I'm a novice R user, much more used to SAS. My problem is pretty
simple - basically, in a data frame, I have variables named
x1,....,x10 and y1,...,y10; and I would like to create r1 = x1 / y1 etc
Apologies if this is way too rudimentary - but I couldn't find any
posts online which solve this exact issue.
Cheers,
Andre
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