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StacksOnStacks
StacksOnStacks

Reputation: 69

ANY? expected input to be an agentset but got the number 0 instead

I'm trying to select the closest free carrier to the cutter and send them to retrieve a metal sheet from delivery for the cutter to cut. This is the relevant code:

globals[
  metal-sheets
  cutter-closest-free-carrier]
breed[carriers carrier]`

to cut  
  let free-carriers carriers with [laden = false]  
  let cutter patches with [machine-type = "cutter"] 
  let delivery patches with [area = "delivery"]  

  ask cutter [
  if status = "import" [
      set cutter-closest-free-carrier min-one-of free-carriers[distance myself]]   ]

  if any? cutter-closest-free-carrier[
      ask cutter-closest-free-carrier [
      face delivery 
      fd 0.01
      set metal-sheets cars-here
      if any? metal-sheets [
        create-link-to one-of metal-sheets [tie]
        face cutter
        fd 0.01
        ask cutter[set status "pending"]] 
    ]    
  ]
end

The error message I get is:

"ANY? expected input to be an agentset but got the number 0 instead."

How can I make this function in the intended way?

Upvotes: 2

Views: 253

Answers (1)

Charles
Charles

Reputation: 4168

I'm assuming that the error is with this:

if any? cutter-closest-free-carrier[

As a global variable, cutter-closest-free-carrier is initialized by NetLogo to zero. If in 

ask cutter [
  if status = "import" [
      set cutter-closest-free-carrier min-one-of free-carriers[distance myself]]   ]

status is not equal to "import", then cutter-closest-free-carrier will still be zero when you apply any? to it. Thus the error. There is another problem too - any? should be applied to agentsets and even if status = "import", cutter-closest-free-carrier will be a single agent as a result of min-one-of, not an agentset.

So, first initialize cutter-closest-free-carrier to nobody, either in your setup or at the beginning of to cut. Then change the test for there being a cutter-closest-free-carrier to 

if cutter-closest-free-carrier != nobody [

I think that should do it.

Hope this helps, Charles

Upvotes: 2

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