Why does “one” < 2 equal FALSE in R?

后端 未结 2 1996
情深已故
情深已故 2020-11-27 22:32

I\'m reading Hadley Wickham\'s Advanced R section on coercion, and I can\'t understand the result of this comparison:

\"one\" < 2
# [1] FALSE
相关标签:
2条回答
  • 2020-11-27 23:10

    It coerces 2 into a character, then it does an alphabetical comparison. And numeric characters are assumed to come before alphabetical ones

    to get a general idea on the behavior try

    'a'<'1'
    '1'<'.'
    'b'<'B'
    'a'<'B'
    'A'<'B'
    'C'<'B'
    
    0 讨论(0)
  • 2020-11-27 23:12

    From help("<"):

    If the two arguments are atomic vectors of different types, one is coerced to the type of the other, the (decreasing) order of precedence being character, complex, numeric, integer, logical and raw.

    So in this case, the numeric is of lower precedence than the character. So 2 is coerced to the character "2". Comparison of strings in character vectors is lexicographic which, as I understand it, is alphabetic but locale-dependent.

    0 讨论(0)
提交回复
热议问题