search for: tp26519740p26519740

.... However I cannot replace 9 by 0 otherwise after the sum is done I wouldn?t be able to distiguish which ones were real zeros and which ones were nines replaced by zero just to sum. Thank you very much -- View this message in context: http://old.nabble.com/How-to-sum-only-a-few-elements-in-a-line-tp26519740p26519740.html Sent from the R help mailing list archive at Nabble.com.