[英]Merge two “list in list” in scheme
I don't know how to exactly express my question in language. 我不知道如何用语言准确表达我的问题。 Pardon my ambiguous words in the title
原谅我模棱两可的标题
My question is: 我的问题是:
If you have 如果你有
a = [[1, 2], [3, 4], [5, 6]....], b = [[1, 3], [4, 8], ....]
a = [[1,2],[3,4],[5,6] ....],b = [[1,3],[4,8],....]
How to merge a and b like 如何像合并a和b
[[1,2], [3, 4], [5, 6], [1, 3], [4, 8]....]
in scheme?? 在计划中?
I have already tried using car or write a function my self to solve it, but all failed. 我已经尝试使用汽车或自己编写函数来解决它,但是都失败了。 I was thinking to use (cons ab), but it'll give me [[[1, 2], [3, 4]...], [[1, 3], [4, 8]...]] which is not what I want.
我本来打算使用(cons ab),但是它会给我[[[1,2],[3,4] ...],[[1,3],[4,8] ...] ],这不是我想要的。 I tried to write a recursive function, but still I'll get the similar trouble as (cons ab)
我试图编写一个递归函数,但仍然会遇到与(cons ab)类似的麻烦
Thanks! 谢谢!
As pointed out in the comments, you're looking for append
. 正如评论中指出的那样,您正在寻找
append
。 This is how the code in the question would look like in Scheme: 这是问题中的代码在Scheme中的样子:
(define a '((1 2) (3 4) (5 6)))
(define b '((1 3) (4 8)))
(append a b)
=> '((1 2) (3 4) (5 6) (1 3) (4 8))
If you want to implement your own version of append
it's simple enough: 如果要实现自己的
append
版本,它就很简单:
(define (my-append lst1 lst2)
(if (null? lst1)
lst2
(cons (car lst1)
(my-append (cdr lst1) lst2))))
(my-append a b)
=> '((1 2) (3 4) (5 6) (1 3) (4 8))
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