Thanks. Your method
mutate( cases = ifelse( country == 'Namibia' & type == 'confirmed' & date == '2021-10-23' & cases == 357, NA, cases ) ) works, as does Rui's mutate( cases = replace( cases, which(country == 'Namibia' & type == 'confirmed' & date == '2021-10-23' & cases == 357), NA ) ) Thank you both, again. el On 2021-10-25 23:14 , Avi Gross via R-help wrote: > I wonder why it is not as simple as: > > Call mutate on the data and have a condition that looks like: > > data %>% mutate(cases = ifelse(multiple_cond, NA, cases) -> output [...] ______________________________________________ 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.