如何首先按字母然后按数字对字符向量进行排序？

Question

我有一个字符向量，其中包含以字母和数字开头的字符串：

sample.condition
[1] "1_t"   "2_t"   "3_t"   "4_t"   "5_t"   "6_t"   "7_t"   "GFP_t" "1_t"  
[10] "2_t"   "3_t"   "4_t"   "5_t"   "6_t"   "7_t"   "GFP_t"

最终排序的向量的第1个位置应包含“ GFP”元素：

sample.condition
[1] "GFP_t"   "GFP_t" "1_t"   "2_t"   "3_t"   "4_t"   "5_t"   "6_t"   "7_t"   "1_t"  
[10] "2_t"   "3_t"   "4_t"   "5_t"   "6_t"   "7_t"   

我尝试了几种排序参数，但无济于事。

Answer 1

查找不以数字开头的字符串。 创建一个逻辑索引：

idx <- grepl("^[^0-9]", sample.condition)

使用此索引进行子集设置和排序。 然后，合并两个排序的子集：

c(sort(sample.condition[idx]), sort(sample.condition[!idx]))

#  [1] "GFP_t" "GFP_t" "1_t"   "1_t"   "2_t"   "2_t"   "3_t"   "3_t"  
#  [9] "4_t"   "4_t"   "5_t"   "5_t"   "6_t"   "6_t"   "7_t"   "7_t"