Question

所以我想建立一个看起来像这样的列表x：[[a1 b1][a2 b2][a3 b3]...]。 A和b分别通过one-of listA和one-of listB选择。我找不到如何轻松创建列表的方法，不能只是将项目添加到空列表中？

Answer 1

检出lput的字典条目以获取添加到列表的一般语法，并查看the programming guide entry和this answer以获得更多信息。对于这个特定问题，请看下面的示例：

to build-lists
  ca
  let a [ 1 2 3 4 5 ]
  let b [ "a" "b" "c" "d" "e" ]

  ; Unordered version:
  let ab []
  repeat length a [
    set ab lput ( list one-of a one-of b ) ab
  ]
  print "Randomly sampled list:"
  print ab

  ; Ordered version:
  set ab ( map [ [ i j ] -> list i j ] a b )
  print "Ordered list: "
  print ab  
  reset-ticks
end

哪个输出类似：

Randomly sampled list:
[[2 a] [2 c] [1 d] [4 d] [1 e]]
Ordered list: 
[[1 a] [2 b] [3 c] [4 d] [5 e]]

Answer 2

分别使用n-values和concise syntax for anonymous procedures，对Luke C的答案略有不同：

let a [ 1 2 3 4 5 ]
let b [ "a" "b" "c" "d" "e" ]

; Unordered version:
print n-values length a [ list one-of a one-of b ]

; Ordered version:
print (map list a b)

如何建立清单清单

2 个答案: