我试图按字母顺序对这些状态名称进行排序，同时保留状态名称左侧的数字。我目前无法弄清楚该如何做。
我尝试使用各种形式的gsub来尝试在排序之前删除数字而没有成功。
这是状态如下的数据集：
print(StateRankings)
# [1] "1. Arizona" "10. Missouri" "11. Tennessee" "12. Florida"
# [5] "13. West Virginia" "14. Kentucky" "15. New Hampshire" "16. Mississippi"
# [9] "17. Wyoming" "18. Alabama" "19. Idaho" "2. Alaska"
#[13] "20. Vermont" "21. Indiana" "22. Arkansas" "23. Wisconsin"
#[17] "24. South Carolina" "25. Nevada" "26. North Carolina" "27. Michigan"
#[21] "28. Louisiana" "29. Ohio" "3. Kansas" "30. Maine"
#[25] "31. Virginia" "32. South Dakota" "33. Pennsylvania" "34. Oregon"
#[29] "35. Nebraska" "36. Iowa" "37. New Mexico" "38. Washington"
#[33] "39. Colorado" "4. Oklahoma" "40. Illinois" "41. Minnesota"
#[37] "42. Delaware" "43. Rhode Island" "44. Maryland" "45. Connecticut"
#[41] "46. California" "47. Hawaii" "48. New Jersey" "49. Massachusetts"
#[45] "5. Montana" "50. New York" "6. Utah" "7. North Dakota"
#[49] "8. Texas" "9. Georgia"
答案 0 :(得分：2)
我们可以从字符向量中删除数字和点，然后使用order仅对名称进行排序，并对原始向量进行子集化。
StateRankings[order(sub("^\\d+\\.\\s+", "", StateRankings))]
#[1] "18. Alabama" "2. Alaska" "1. Arizona" "12. Florida" "19. Idaho"
# 6] "14. Kentucky" "16. Mississippi" "10. Missouri" "15. New Hampshire"
#[10] "11. Tennessee" "13. West Virginia" "17. Wyoming"
仅供参考，R具有内置状态名称，该名称以升序存储在state.name
state.name
#[1] "Alabama" "Alaska" "Arizona" "Arkansas" "California" "Colorado"
#[7] "Connecticut" "Delaware" "Florida" "Georgia" "Hawaii" "Idaho"........
数据
StateRankings <- c("1. Arizona", "10. Missouri", "11. Tennessee" ,"12. Florida",
"13. West Virginia" ,"14. Kentucky", "15. New Hampshire", "16. Mississippi",
"17. Wyoming", "18. Alabama", "19. Idaho" ,"2. Alaska")