如何避免错误：“期望文字值”？

Question

我想创建一个场景，其中特定事件发生的概率每次发生都会增加。我想为此定义一个局部变量，但出现错误：

"Expected literal value" appeared (\*\*\*) 

现在我不知道如何继续。

代码：

; If bird and cat share a patch, the cat should catch (kill) the bird with a certain probability (hunting-skill)

; This probablity shoud increase everytime the cat successfully catches a bird


to catch-event
  ask cats [
  let hunting-improvment [ hunting-skill * catch-rate-increase ]
    if any? birds-here [
      if random-float 1 <= hunting-skill [
        ask one-of birds-here [
          die 
          set hunting-skill hunting-skill + hunting-improvment
        ]
      ]
    ]
  ]
end

Answer 1

您似乎错误地使用了

let

和方括号。要么根本不使用括号，要么如果您想使用括号，请使用圆形括号。

这是代码的固定最小示例：

breed [cats cat]
breed [birds bird]

cats-own [hunting-skill catch-rate-increase]

to go 
  create-cats 5 [
    set hunting-skill 0
    set catch-rate-increase 1
  ]
end


to catch-event
  ask cats [
  let hunting-improvment (hunting-skill * catch-rate-increase)
    if any? birds-here [
      if random-float 1 <= hunting-skill [
        ask one-of birds-here [
          die 
          set hunting-skill hunting-skill + hunting-improvment
        ]
      ]
    ]
  ]
end