NetLogo 6.0.2中member?命令未按预期工作问题求助

Hey, I see you've got your turtles building their own aware-of-who lists successfully, but you're hitting a snag when using member? to find neighbors that are on those lists. Let's break down what might be going wrong and how to fix it:

1. Double-check your member? syntax and logic #

NetLogo's member? works by checking if a specific value exists in a list—remember the order is member? item list, not the other way around! If you're trying to filter neighbors whose who numbers are in the current turtle's aware-of-who list, your code should look something like this:

ask turtles [
  let aware-neighbors neighbors with [ member? who [aware-of-who] of myself ]
  # Add your code to work with aware-neighbors here
]

Key note: myself refers to the turtle currently running the command, so [aware-of-who] of myself pulls up that turtle's awareness list. We then check if each neighbor's who is present in that list.

2. Verify your aware-of-who list is built correctly #

Your list-building code is on the right track, but there are a couple of small issues that might throw off your member? checks later:

ask turtles [ 
  foreach cheater-list [ x -> 
    if random-float 100 < 90 [
      set aware-of-who lput ([who] of x ) aware-of-who
    ] 
  ]
]

• Duplicate entries: If cheater-list has repeated turtles, or if you run this code multiple times, you'll end up with duplicate who numbers in aware-of-who. While member? will still work, redundant data can mess with other logic down the line. Fix this by checking if the who is already in the list before adding it:

  if random-float 100 < 90 and not member? ([who] of x) aware-of-who [
    set aware-of-who lput ([who] of x ) aware-of-who
  ]
  

• Uninitialized list: Make sure you set aware-of-who to an empty list when you create your turtles! If you skip this, the first lput will cause errors or create a broken list structure. Add this to your setup:

  turtles-own [ aware-of-who ]
  to setup
    clear-all
    create-turtles 10 [
      set aware-of-who [] ; Start with an empty list
    ]
    ; Rest of your setup code here
  end
  

3. Watch out for common logic mix-ups #

• Self-inclusion: If your code accidentally adds the turtle's own who to aware-of-who, don't worry—neighbors doesn't include the turtle itself, so this won't break the filter. But if you ever switch to other turtles instead of neighbors, you'll want to exclude the turtle from the check.
• Neighbor definition: NetLogo's neighbors only includes turtles within a distance of 1 (by default). If you've adjusted the world size or changed the connection distance, your neighbor list might not be what you expect. Test this by running show neighbors in the Command Center while a turtle is selected to see exactly which turtles are considered neighbors.

4. Debug with quick print statements #

The easiest way to figure out what's going wrong is to see the actual values your code is working with. Add these lines to your code to print data to the Command Center:

ask turtles [
  show aware-of-who ; Print the turtle's awareness list
  show neighbors ; Print all current neighbors
  let aware-neighbors neighbors with [ member? who [aware-of-who] of myself ]
  show aware-neighbors ; Print the filtered neighbors
]

This will let you compare the who numbers in aware-of-who against your neighbors' who numbers, so you can spot exactly where the filter isn't working as expected.

内容的提问来源于stack exchange，提问作者Susan