Question

Suppose I have a variable y and a variable i.

y<- c(TRUE, TRUE, TRUE)
i<- 0

Let’s say I would like to test the following if-statement for every boolean condition in y:

if (y) {
i<-1
}

How would I do this? That is, I want i = 1 if every boolean condition in y is TRUE.

If y<- c(TRUE, FALSE,TRUE), then I want the if-statement to evaluate to FALSE and i=0. Does anyone know how would I do this? Currently I getting this warning message:

Warning message:
In if (y) { :
  the condition has length > 1 and only the first element will be used.

How would I test the variable y for each of it’s boolean conditions?

Answer 1

You are looking for the all function.

> y <- c(T, T, T)
> all(y)
[1] TRUE
> y <- c(T, T, F)
> all(y)
[1] FALSE