CODEWITHSUNDEEP
colorsnetlogopatchnearest-neighbor
bksnlow
bksnlow

Reputation: 137

Netlogo: Set a variable to the number of neighbors of a certain color

im just trying to count the patches that have a certain color and add that count number to a variable. Then, if the number of neighbors crosses a threshold the patch changes color but im getting a Set expected 2 inputs. I think this is a basic question but after reading i dont get the result i need.

patches-own
[reforestar
;deforestar
  ;temperatura
;humedad
;dosel
]

to setup
  clear-all
  set-default-shape turtles "frog top"

    ask patches with [
    pxcor <= 30 and
    pxcor >= min-pxcor and
    pycor <= 60 and
    pycor >= min-pycor ] [
    set pcolor 35 ;
  ]
 ;potrero
  ask patches with [
    pxcor <= 60 and
    pxcor >= 30 and
    pycor <= 60 and
    pycor >= min-pycor ] [
    set pcolor 44 ;
  ]
  ;borde
  ask patches with [
    pxcor <= 90 and
    pxcor >= 60 and
    pycor <= 60 and
    pycor >= min-pycor ] [
    set pcolor 66 ;
  ]
end
to go
ask patches [ deforestacion ]
end

to potrerizar
 if pcolor = 44 [
    ask patches [ set potrerizado count neighbors with [pcolor = 35] ]]
  
    
end
to deforestacion 
  if potrerizado >= 3 [if random 100 <= tasa-deforestacion 
    [set pcolor = 35]]

Thanks in advance

Upvotes: 0

Views: 267

Answers (1)

Matteo
Matteo

Reputation: 2926

Regarding set, it's indeed because set expects two inputs: the variable to set and its new value, without any other sign between these two inputs - see here. You had also used it correctly in to setup.

In NetLogo, = is instead used to evaluate conditions (i.e. it expects two inputs, one on the right and one on the left, and it returns either true or false). Therefore, writing

set pcolor = 35

is the same as writing

set true   ; if the patch has pcolor = 35, or
set false  ; if the patch has pcolor != 35.

none of which makes sense in NetLogo.

As for the rest: at the moment, what your code does entirely depends on the value of potrerizado that is set in the interface:

  1. If it's less than 3, nothing happens;
  2. If it's at least 3, patches will have a certain chance of becoming brown (set pcolor 35). Which means that, sooner or later, they will all be brown.

In the code, at the moment, to potrerizar is never used.

Anyway, I can see that to potrerizar asks patches to change potrerizado, which is a global variable.

Probably what you want is to have potrerizado as patches-own and not as global, but this is just my guess based on what I can see here.

Less important, you have some superflous conditions: every patch will always have pxcor >= min-pxcor (and similar conditions that you have in to setup).

Upvotes: 1

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