是否有类似于month.abb
R 中的函数可以显示每个月的第一个字母?例如month.abb返回'Jan','Feb'......我希望寻求的函数返回'J','F',......
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3 回答
8
month.abb 对象不是一个函数,而是一个向量。这是请求的模拟:
short.mo <- substr(month.abb, 1,1)
您可以通过以下方式查看其他内置常量:
?Constants
于 2013-10-29T21:23:00.737 回答
7
R> month.abb
[1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
R> substr(month.abb, 1, 1)
[1] "J" "F" "M" "A" "M" "J" "J" "A" "S" "O" "N" "D"
R>
只需将其包装在一个函数中即可。
于 2013-10-29T21:22:52.303 回答
2
这是另一种按名称索引缩写的方法。
abbreviate(month.name, 1, strict=TRUE)
# January February March April May June July
# "J" "F" "M" "A" "M" "J" "J"
# August September October November December
# "A" "S" "O" "N" "D"
于 2013-10-30T12:27:40.437 回答