Test if a value is missing, empty, or contains only NA or NULL values
Test if a value is missing, empty, or contains only NA or NULL values.
invalid(x)
x |
value to be tested |
Logical value.
Gregory R. Warnes greg@warnes.net
invalid(NA)
invalid()
invalid(c(NA,NA,NULL,NA))
invalid(list(a=1,b=NULL))
# example use in a function
myplot <- function(x,y) {
if(invalid(y)) {
y <- x
x <- 1:length(y)
}
plot(x,y)
}
myplot(1:10)
myplot(1:10,NA)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.