Trying to add a column but getting a condition has length >1 error

Question

for (i in 1:nrow(y)){
  if (y$first_completed_date == NA) {
    y$comp[i]<-1
  }
  else {
    y$comp[i]<-0
  }
}

the condition has length > 1 an

Answer 1

is.na can be used for creating a logical expression for NA elements instead of ==. Also, warning is because we are using if/else and not ifelse as if/else is not vectorized. The straightforward option would be to create the logical expression with is.na and coerce that to binary with as.integer so that TRUE -> 1 and FALSE ->0

y$comp <- as.integer(is.na(y$first_completed_date))