问题描述
我有一些复杂的代码，但是我没有向您展示这一点，而是要提取问题的本质.
I have some complicated code, but instead of showing you that, I am going to extract the essence of the problem.
评估:"dogs" < "cats"…这应该评估为FALSE，在R 3.6中也是如此.
Evaluate: "dogs" < "cats" … This should evaluate to FALSE and it does in R 3.6.
求值:"Dogs" < "cats"…这应该求值为TRUE，因为"D"的ASCII码为68，而"c"的ASCII码为99. 99，"Dogs" < "cats"应该计算为TRUE，但在R 3.6.0中则不这样.但是，当我尝试使用 https://datacamp.com 网站上的控制台窗口时，表达式"Dogs" < "cats"返回了TRUE和表达式"dogs" < "Cats"返回FALSE-符合预期.
Evaluate: "Dogs" < "cats" … This should evaluate to TRUE because the ASCII code for "D" is 68 and the ASCII code for "c" is 99. Since 68 < 99, "Dogs" < "cats" should evaluate to TRUE, but it does not in R 3.6.0. However, when I tried using the Console window on the https://datacamp.com website, the expression "Dogs" < "cats" returned TRUE and the expression "dogs" < "Cats" returned FALSE - as expected.
因此，我的问题是，为什么R 3.6.0为("Dogs" < "cats")返回FALSE?
Hence, my question is, why does R 3.6.0 return FALSE for ("Dogs" < "cats") ?
推荐答案
DataCamp的解释器显示:
The interpreter at DataCamp shows:
> Sys.getlocale()
[1] "C"
而我的，也许是你的:
> Sys.getlocale()
[1] "en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8"
在"C"语言环境下，字符将按其ascii值进行比较，而对于en_US.UTF-8，它们将使用aAbBcC，依此类推.
With the "C" locale, characters are compared by their ascii values, whereas for en_US.UTF-8, they go aAbBcC and so on.
如评论中所述，这在关系运算符的文档中有进一步的解释:
As mentioned in the comments, this is explained further in the documentation for relational operators:
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