Hello List,I have a data frame which having the character columns: | a1 | b1 | c1 | d1 | | a2 | b2 | c2 | d2 | | a3 | b3 | c3 | d3 | | a4 | b4 | c4 | d4 | | a5 | b5 | c5 | d5 |
I need to do: if a1 not = "Positive" and not = "VUS" then values of b1, c1 and d1 will be zero out. And do the same thing for the a2 to a5 series. I write the code below to do this. But it doesn't work. Would you please correct my code? Thank you, Kai for (i in 1:5) { if (isTRUE(try$a[i] != "Positive" && try$a[i] != "VUS")) { try$b[i]== '' try$c[i] == '' try$d[i]== '' } } [[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.