Question

I have a vector of size 5 e.g.:

 a<-c(1,4,6,3,2)

I also have another vector of size 1:

 b<-9

I would like to write the following if condition:

if (a>b) { 1
}
else 0
}

I get the following warning:

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

What I would actually like it to do is to check if any of the elements in ‘a’ satisfy the condition.

Answer 1

Use any() and a comparison:

if(any(a > b)) {
  # Executes if any value in a > b.
} else {
  # No a is greater than b.
} 

Another way of doing it using pmax():

if (any(pmax(a, b) == a)) {

} else {

} 

That’s saying that if any of the max of (a, b) is equal to the value in a, then a must be greater.