When trying to replace values, “missing values are not allowed in subscripted assignments of data frames”

Question

I have a table that has two columns: whether you were sick (H01) and the number of days sick (H03). However, the number of days sick is NA if H01 == false, and I would like to s

Answer 1

Following works. Watch out there is no comma in sub setting:

x <- data.frame(a=c(NA,2:5), b=c(1:5))

x$a[x$a==2] <- 99