NetLogo two agentsets operations

Question

I have two agentsets. Are there functions for finding:

1. An agentset of agents that are present in both (intersection)
2. An agentset of agents that are pr

Answer 1

For the first one you use the turtle-set primitive. For the second one you need the member? primitive, which also works on agentsets. As such:

to setup
  ca
  create-turtles 10 [set color red]
  create-turtles 10 [set color blue]
  let red-ones turtles with [color = red]
  let blue-ones turtles with [color = blue]

  ;join 2 agent sets
  let joinset (turtle-set red-ones blue-ones)
  show joinset

  let even-ones (turtles with [who mod 2 = 0])
  ;subtract even-ones from red-ones
  let subtractset red-ones with [not member? self even-ones]
  show subtractset
end