Hello everybody; I'm writing a code where part of it is as follows:
for (i in nrow(dadosmax)){ dadosmax$enchday[i] <- if (sum(dadosmax$above[i:(i+44)]) >= 45) 1 else 0 } That is for each row of my data frame, sum an specific column (0 or 1) of that row plus 44 rows. If It is >=45 than enchday is 1 else 0. The following error is returned: Error in if (sum(dadosmax$above[i:(i + 44)]) >= 45) 1 else 0 : missing value where TRUE/FALSE needed I've tested the ifelse statement assigning different values to i and it works. So I'm wondering if this error is due the fact that at the final of my data frame there aren't 45 rows to sum anymore. I tried to use "try" but It's simply hide the error. How can I deal with this? Any ideas? Thank you very much. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.