How to change the colour of random turtles in NetLogo

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I am reusing the Traffic 2 Lanes sample on Netlogo to try and simulate how a smart self driving car operates around regular cars. There are 5 different levels of autonomy from Level 1-5. I have a slider for this called level-of-autonomy, but all it does now is just change all the colours of the cars that have a greater level of autonomy to red, I'll post it below. How do I make the colour of like half the cars on the road, when the user uses the slider to determine the amount of cars in total when I set the level of autonomy to lets say 4 so the cars are like lets say blue, then level 5 cars like yellow for example.

So lets say the slider for the amount of cars is like set on 40, I would like 20 cars to be a specific colour for the 5 different levels, how can this be done, any help would be wonderful, especially from the user Charles.

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1 Answers

ask turtles already selects the turtles one by one randomly. so to randomly assign a color to half of an agentset, it is enough to simply count the number of colored agents and stop coloring when the target amount is reached.

ask turtles [
  if [count turtles with [color = blue] < number-of-cars / 2][
    set color blue
  ]
]
user_42187720
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