R 中 gtools::mixedsort 包的奇怪行为答案

【问题标题】：Strange behavior with gtools::mixedsort package in RR 中 gtools::mixedsort 包的奇怪行为
【发布时间】：2020-02-23 01:15:52
【问题描述】：

我喜欢使用 gtools 包中的混合排序/排序功能来进行字母数字排序。但是，我遇到了一种非常奇怪的行为，在某些情况下，它不适用于字符 E。请参阅一些示例。有人能帮我吗？怎么了？

正确排序：

> mixedsort(c("P0A1","P0B1","P0C1","P0D1","P0G1","P0F1"))
[1] "P0A1" "P0B1" "P0C1" "P0D1" "P0F1" "P0G1"

字符 E 的排序错误：

> mixedsort(c("P0A1","P0E1","P0C1","P0D1","P0G1","P0F1"))
[1] "P0E1" "P0A1" "P0C1" "P0D1" "P0F1" "P0G1"

字符 E 的正确排序：

> mixedsort(c("PA1","PE1","PC1","PD1","PG1","PF1"))
[1] "PA1" "PC1" "PD1" "PE1" "PF1" "PG1"

【问题讨论】：

【解决方案1】：

在R中0E1是浮点0：

0E1
## [1] 0

看来你需要给它一些帮助。在最后一个非数字后插入一个空格，排序然后删除。

sub(" ", "", mixedsort(sub("^(.*\\D)", "\\1 ", x)))
## [1] "P0A1" "P0C1" "P0D1" "P0E1" "P0F1" "P0G1"

【讨论】：