根据列对数据帧进行排序，应用自然分类

Question

标题是不言自明的，我知道如何根据列对数据框进行排序，我知道如何对变量进行自然排序，但我不能使用自然排序对数据框进行排序。

检查以下MWE：

mydf <- data.frame(name=c("B","C","A","E","F","Z","U","D","G","J"), 
                   section=c(NA,"section1","section2","section2","section10","section1",
                                                             NA,"section10","section3",NA))

mydf <- mydf[order(mydf$section, mydf$name, decreasing=FALSE),]#normal sort on data frame

library(gtools)

sortvar <- mixedsort(mydf$section)#natural sort on variable
sortvar
#NATURAL SORT ON DATAFRAME???

我希望获得一个数据框，首先按＆＃34;部分＆＃34;，然后按＆＃34; name＆＃34;，使用自然排序，如下：

   name   section
2     C  section1
6     Z  section1
3     A  section2
4     E  section2
9     G  section3
8     D section10
5     F section10
1     B      <NA>
10    J      <NA>
7     U      <NA>

任何人？谢谢！

Answer 1

mydf[with(mydf, order(as.integer(sub('\\D+', '', section)), name)),]
#   name   section
#2     C  section1
#6     Z  section1
#3     A  section2
#4     E  section2
#9     G  section3
#8     D section10
#5     F section10
#1     B      <NA>
#10    J      <NA>
#7     U      <NA>