generate an error in r code example

Example 1: how to throw an error in R

x <- ifelse(x < 0 | x > 1, NA, x )
 if( any(is.na(x)) ) warning('x not between 0 and 1')
 log(x / (1 - x) )

Example 2: how to throw an error in R

logit <- function(x){
 if( any(x < 0 | x > 1) ) stop('x not between 0 and 1')
 log(x / (1 - x) )
}