如何重新排序 R 中的字符串以遵循一致的模式

Question

I have vector of strings of the type: 2004/083.BHP , 2007.MAIS.0048 and 2006/0066 . There are lots of these strings of varying characters.

I would like to have consistentcy in the representation of these strings, so that they look something like 083/2004.BHP , 0048/2007.MAIS and 0066/2006 .

How do I get all strings in this vector to appear in this way without manually coding it? I understand this is a difficult task, and any help is appreciated.

Thank you in advance.

Answer 1

Here are a few suggestions for ordering or sorting your strings in a consistent pattern (such as by alphabetic order or by number of characters). The last case, sorts by starting with a 4-digit (ie date) and then by name.

  strings <- c("2004/083.BHP","2007.MAIS.0048","2006/0066","432.ABC","2008/42002","2094/31.AC")
strings <- sort(strings)
strings
strings <- strings[order(nchar(strings))]
strings
strings <- strings[order(strings,decreasing =T) ]
strings
strings <- strings[order(grepl("^\\d{4}",strings),strings,decreasing =F) ]
strings