Help to create a given number of turtles based on a distance criterion

[Rafaela Lorena]

Hello,

We're creating code and we're having trouble doing the following:

We would like to create a specific number of turtles (for example 100 turtles)  based on the following criteria:
1) distance between agents must be greater than or equal to 2

We've already tried:

ask n-of 100 patches [
    if not any? turtles in-radius 2 [      
sprout-turtles 1 [ setup-turtles ] ]
    ]
  ]

it didn't work, because less than 100 agents are being born even though the world holds the required amount of agents, which in this case is 100

Does anyone have any suggestions on how we can resolve this issue?

Thanks in advance

[Wannes...@hotmail.be]

Hello,

The following code should work:

patches-own [ crowded ]

to setup

  

  ask patches [ set crowded FALSE ]

  

  while [count turtles < 100] [

    ask turtles [

      ask patches in-radius 2 [

        set crowded TRUE

      ]

    ]

    ask one-of patches with [ not crowded ] [

      sprout 1

    ]

  ]

  

end

  

I am sure that there are more elegant solutions some other people here might give you but it is a start.

Good luck!

Op dinsdag 9 november 2021 om 15:49:29 UTC+1 schreef rafael...@gmail.com:

[Wannes...@hotmail.be]

And immediately for the more elegant solution:

to setup2

  while [count turtles < 100] [

    ask one-of patches with [not any? turtles in-radius 2] [

      sprout 1

    ]

  ]

  

end

Good luck again

Op dinsdag 9 november 2021 om 19:10:36 UTC+1 schreef lei...@natur.cuni.cz:

[Wannes...@hotmail.be]

One last solution if you would like to use create-turtles instead of sprout

to setup 3

  ca

  crt 100 [ let free-patch one-of patches with [ not any? other turtles in-radius 2 ]

    setxy 

    [pxcor] of free-patch

    [pycor] of free-patch

  ]

  

end

Op dinsdag 9 november 2021 om 19:15:08 UTC+1 schreef lei...@natur.cuni.cz:

[Pradeesh Kumar K V]

Hello Rafaela,

The problem is that you are asking only 100 patches to create a total of 100 turtles with the condition that there are no nearby turtles. Initial set of patches will find nearby areas unoccupied and hence will sprout turtles. But as new turtles are created, patches called later on by the ask command will find that nearby patches are already occupied and hence will not sprout turtles. Since the request is made only to 100 patches, it is very likely that the number of turtles at the end is less than 100.

I suggest the following modified code:

to setup
 
  while [count turtles < 100] [
   
    ask one-of patches [

   
    if not any? turtles in-radius 2 [
     

      sprout 1 [setup-turtles]
    ]
 
  ]
 
end

Here you are repeatedly asking patches to check and sprout turtles until the total number of turtles equals the desired value i.e. 100.

Hope this helps.

Best,

Pradeesh

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[James Steiner]

Check out this demonstration model. It's one from 2006 that I dusted off and put in the modeling commons.

http://modelingcommons.org/browse/one_model/6868

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[Rafaela Lorena]

Hi,

Thank you so much to everyone who responded 😊. Your answers helped a lot.

Cheers

Rafaela

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