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Paul
Paul

Reputation: 189

Making a list with temporal variables and choose random one of those elements

Hi i am doing a model and i need to make a list of elements using the values of a temporal variable. This is the code that i have used to define my temporal variables

to react
  ask  cells
   [
   let Ai1 count turtles with [color = blue and xcor < -13 and ycor > -26] 
   let Ai2 count turtles with [color = blue and xcor < -13 and ycor < -27] 
   let Ai3 count turtles with [color = blue and xcor > -12 and xcor < 11 and ycor > -26]
   let Ai4 count turtles with [color = blue and xcor > -12 and xcor < 11 and ycor < -26]
    let Ai5 count turtles with [color = blue and xcor > 11 and ycor > -26]
    let Ai6 count turtles with [color = blue and xcor > 11 and ycor < -26]
  let Aimax list  (Ai1 Ai2 Ai3 Ai4 Ai5 Ai6)
   set calories (44.5 * random Aimax)
     ]
  end

So i need to make a list of the Ai1...Ai6 values and then choose ramdomly one of this 6 values to use it in the next multiplication of the temporal variable Aimax so is posible to do that? If i use the command random it can be used in lists? Tks for reading.

Upvotes: 0

Views: 52

Answers (2)

Alan
Alan

Reputation: 9620

Don't do it that way. You are having each cell compute all the counts, which only need to be determined once. You also repeated filter your turtles on the color blue. If we stick with your bounds, we can write

to-report countblues
  let blues (turtles with [color = blue])
  let counts (list
    count blues with [xcor < -13 and ycor > -26] 
    count blues with [xcor < -13 and ycor < -27] 
    count blues with [xcor > -12 and xcor < 11 and ycor > -26]
    count blues with [xcor > -12 and xcor < 11 and ycor < -26]
    count blues with [xcor > 11 and ycor > -26]
    count blues with [xcor > 11 and ycor < -26]
    )
  report counts
end

to react
  let counts countblues
  ask  cells[
    set calories (44.5 * one-of counts)
  ]
end

Note that if you turtles never change colors you could turn blues into a global, although there would be small gain to that and each global has a cost in referential transparency.

Upvotes: 0

Bryan Head
Bryan Head

Reputation: 12580

one-of will pick a random item from a list:

set calories (44.5 * one-of Aimax)

Upvotes: 1

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