How to randomly allocate my agents?

[Mustafa Ali Saba]

Hi dear friends,

I have a world like this.

to draw-simple
  let top-wall 0
  let bottom-wall 0
 
  ask patches [set pcolor 7]
 
  repeat 81 [
    ask patch top-wall ((horizontal-corridor-width + 1) / 2) [
      set pcolor 0
    ]
    set top-wall (top-wall + 1)
  ]

  repeat 81 [
    ask patch bottom-wall (-((horizontal-corridor-width + 1) / 2)) [
      set pcolor 0
    ]
    set bottom-wall (bottom-wall + 1)
  ]
end

horizontal-corridor-width is a slider from 1 to 20. The drawing is as follows.





I want to distribute my agents along the hallway without traspassing the walls. I have tried something like this.

to create-pedestrians-simple
 
  create-east-crowd num-pedestrians-east [
    set color red
    set size 1
    setxy 40 0
    set heading 270
  ]

  create-west-crowd num-pedestrians-west [
    set color blue
    set size 1
    setxy random-xcor random-ycor
    set heading 90
  ]
end




east-crowd and west-crowd are breeds and the variables num-pedestrians-east and num-pedestrians-west are sliders from 0 to 1600 agents.




Hope to be clear enough.




Thank all of you, dear comunity.


[Pradeesh Kumar K V]

Hello Mustafa,

In order to set the agents within the corridor, you need to specify the max. y as the y coordinate of  top wall patches and min y as the y of bottom wall patches.

For example, if your top wall y coordinate is 10, then you need to define setxy random-xcor random 10. In this case all the agents will be between y coordinate 0 and 10

If your bottom wall y coordinate is -10, then you need to define setxy random-xcor random -10 for set of agents below the '0' y coordinate.

You will have to use a random function to distribute the agents uniformly between the top half and bottom half of the '0' y coordinate.

Hope this helps.

Pradeesh

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[Aaron Andre Brandes]

Hi Mustafa,

Here is an answer to your question, along with a couple of suggestions.

 

Since a single agent in your model is a pedestrian, I suggest you use names  similar to those below, which would be consistent with variable names such as num-pedestrians-west

 

It is custom, but not requirement to call the initialization function setup, and to clear values at the beginning.

Notice in create-corridor that it is possible to address a whole set of patches at once (although your method works too).

I use the function ceiling to identify the same patches you do. For example if horizontal-corridor-width is 20

patch 0 10.5 is the same as patch 11, and ceiling 10.5 = 11. while

patch 0 -10.5 is the same as patch -10, and ceiling -10.5 = 10

 

The question you were specifically asking is answered by the function

random-corridor-ycor

The approach is similar to that suggested by Pradeesh. I use random-float rather than random, in order to get non-integer values, and don’t treat agents above and below the x axis separately

Code:

 

breed [ pedestrians-east pedestrian-east ]

breed [ pedestrians-west pedestrian-west ]

 

to setup

  clear-all

  reset-ticks

 

  create-corridor

 

   create-pedestrians-east num-pedestrians-east [

    set color red

    set size 1

    setxy random-xcor random-corridor-ycor

    set heading 270

  ]

 

  create-pedestrians-west num-pedestrians-west [

    set color blue

    set size 1

    setxy random-xcor random-corridor-ycor

    set heading 90

  ]

end

 

to create-corridor

  ask patches [set pcolor 7]

  ask patches with [ pycor  = corridor-top or pycor  = corridor-bottom ] [

    set pcolor 0

  ]

end

 

to-report corridor-top

  report ceiling ((horizontal-corridor-width + 1) / 2.0)

end

 

to-report corridor-bottom

  report ceiling ((horizontal-corridor-width + 1) / -2.0)

end

 

to-report random-corridor-ycor

  ; The smallest y coordinate should be above the corridor bottom

  ; The size of the occupiable corridor space is horizontal-corridor-width - 1

  report corridor-bottom + 1 + random-float (horizontal-corridor-width - 1)

end

 

• Aaron

 

Aaron Brandes, Software Developer

Center for Connected Learning and Computer-Based Modeling

 

 

From: <netlog...@googlegroups.com> on behalf of Mustafa Ali Saba <alisaba...@gmail.com>
Date: Sunday, January 12, 2020 at 10:25 PM
To: netlogo-users <netlog...@googlegroups.com>
Subject: [netlogo-users] How to randomly allocate my agents?

 

 

Hi dear friends,

 

I have a world like this.

 

to draw-simple
  let top-wall 0
  let bottom-wall 0
 
  ask patches [set pcolor 7]
 
  repeat 81 [
    ask patch top-wall ((horizontal-corridor-width + 1) / 2) [
      set pcolor 0
    ]
    set top-wall (top-wall + 1)
  ]

  repeat 81 [
    ask patch bottom-wall (-((horizontal-corridor-width + 1) / 2)) [
      set pcolor 0
    ]
    set bottom-wall (bottom-wall + 1)
  ]
end

horizontal-corridor-width is a slider from 1 to 20. The drawing is as follows.

 

I want to distribute my agents along the hallway without traspassing the walls. I have tried something like this.

to create-pedestrians-simple
 
  create-east-crowd num-pedestrians-east [
    set color red
    set size 1
    setxy 40 0
    set heading 270
  ]

  create-west-crowd num-pedestrians-west [
    set color blue
    set size 1
    setxy random-xcor random-ycor
    set heading 90
  ]
end

 

east-crowd and west-crowd are breeds and the variables num-pedestrians-east and num-pedestrians-west are sliders from 0 to 1600 agents.

 

Hope to be clear enough.

 

Thank all of you, dear comunity.

--

[George BUTLER]

Hi Mustafa,

You simply need to set the ycor of your pedestrians as a function of the position of your walls. The following code should do just fine as it places all of your blue pedestrians in between the walls :

to create-pedestrians-simple

  let limit (abs([pycor] of one-of patches with [pcolor = 0]) - 1)

 
  create-east-crowd num-pedestrians-east [
    set color red
    set size 1
    setxy 40 0
    set heading 270 ]

  create-west-crowd num-pedestrians-west [
    set color blue
    set size 1

    setxy random-xcor ((random (2 * limit) ) - limit )
    set heading 90 ]
end

George J. Henry BUTLER STREESE

--