Hello, I have a matrix with the numbers 0,1 and 9 I would like to write a function that could sum each line skiping everytime a number 9 appears for example [0 1 0 1 1 9 1] the sum would be 4. 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. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.