n-of is used when we want to randomly select a specific number of elements out of an agent set. It is similar to how one-of works. For example, if we wanted to create a model in which we wanted to have 90 yellow birds and 10 red birds, we would write the following code instead of using create-turtles twice:

create-turtles 100 [
    set shape "bird"
    set color yellow
    setxy random-xcor random-ycor
]
ask n-of 10 turtles [
    set color red
]

Things to keep in mind when using n-of:

• If an agentset has less than the provided number of agents, NetLogo will show an error. For example, if we had 5 turtles in a model, the following code would give an error: ask n-of 10 turtles [move].

In the model example below, we use n-of to pick 50 random patches to sprout 50 plants. We also create 5 cows to graze in this grassland. We also use n-of to make two of our cows violet.