문자 벡터의 R 정렬 규칙은 무엇입니까?

Question

R은 문자 벡터를 ASCII가 아니라 영문자로 설명하는 시퀀스로 정렬합니다. 예를 들어

:

sort(c("dog", "Cat", "Dog", "cat")) 
[1] "cat" "Cat" "dog" "Dog" 

세 가지 질문 :

1. 이 정렬 순서를 설명하는 기술적으로 올바른 용어는 무엇입니까?
2. CRAN의 설명서에서 이에 대한 언급을 찾을 수 없습니다. R에서 정렬 규칙에 대한 설명을 어디에서 찾을 수 있습니까?
3. 이것은 C, Java, Perl 또는 PHP와 같은 다른 언어의 동작과 다릅니다.

Answer 1

Details:sort()에 대한 상태 :

The sort order for character vectors will depend on the collating 
sequence of the locale in use: see ‘Comparison’. The sort order 
for factors is the order of their levels (which is particularly 
appropriate for ordered factors). 

및 help(Comparison) 다음을 보여줍니다

Comparison of strings in character vectors is lexicographicwithin 
the strings using the collating sequence of the locale in use:see 
‘locales’. The collating sequence of locales such as ‘en_US’ is 
normally different from ‘C’ (which should use ASCII) and can be 
surprising. Beware of making _any_ assumptions about the 
collation order: e.g. in Estonian ‘Z’ comes between ‘S’ and ‘T’, 
and collation is not necessarily character-by-character - in 
Danish ‘aa’ sorts as a single letter, after ‘z’. In Welsh ‘ng’ 
may or may not be a single sorting unit: if it is it follows ‘g’. 
Some platforms may not respect the locale and always sort in 
numerical order of the bytes in an 8-bit locale, or in Unicode 
point order for a UTF-8 locale (and may not sort in the same order 
for the same language in different character sets). Collation of 
non-letters (spaces, punctuation signs, hyphens, fractions and so 
on) is even more problematic. 

그래서 당신의 로케일 설정에 따라 달라집니다.