基于R中少数列名中的特定前缀重新排序矩阵列答案

【问题标题】：Reordering matrix columns based on specific prefix in few column names in R基于R中少数列名中的特定前缀重新排序矩阵列
【发布时间】：2015-04-13 08:49:10
【问题描述】：

我在 R 中有一个带有列名的 matrix。

> colnames(m)
 [1] "caz_RNAi1_R1"     "caz_RNAi2_R1"     "cg1316_RNAi1_R1"  "cg1316_RNAi2_R1"  "cg4612_RNAi1_R1" 
 [6] "cg4612_RNAi2_R1"  "Dp1_RNAi1_R1"     "Dp1_RNAi2_R1"     "fmr1_RNAi1_R1"    "fmr1_RNAi2_R1"   
[11] "GFP_RNAi1_R1"     "GFP_RNAi2_R1"     "GFP_RNAi3_R1"     "GFP_RNAi4_R1"     "GFP_RNAi5_R1"    
[16] "GFP_RNAi6_R1"     "hrb87f_RNAi1_R1"  "hrb87f_RNAi2_R1"  "hrb98de_RNAi1_R1" "hrb98de_RNAi2_R1"

现在，一些列名具有前缀GFP。我想重新排序矩阵列，以便名称中具有此前缀的列将是开始列，其余列将按字母顺序排列。

所以colnames(m) 应该像这样订购：

"GFP_a", "GFP_b", "GFP_c",..."GFP_z", "a", "b","c","d", ....

这样做的方法是什么？

【问题讨论】：

您想要一个混合顺序，同时对字符和数字进行排序？

标签： r matrix alphabetical

【解决方案1】：

你可以的

 m[order(-(grepl('^GFP', m))+1L)]

m 来自@Mamoun Benghezal 的帖子。在示例中，它已经按字母顺序排列，但万一不是

 set.seed(24)
 m1 <-sample(m)
 m1[order(m1)][order(-(grepl('^GFP',m1[order(m1)]))+1L)]

【讨论】：

【解决方案2】：

你可以试试这个

m <-  c("caz_RNAi1_R1", "caz_RNAi2_R1", "cg1316_RNAi1_R1", "cg1316_RNAi2_R1", "cg4612_RNAi1_R1",
        "cg4612_RNAi2_R1", "Dp1_RNAi1_R1", "Dp1_RNAi2_R1", "fmr1_RNAi1_R1", "fmr1_RNAi2_R1",
        "GFP_RNAi1_R1", "GFP_RNAi2_R1", "GFP_RNAi3_R1", "GFP_RNAi4_R1", "GFP_RNAi5_R1",
        "GFP_RNAi6_R1", "hrb87f_RNAi1_R1",  "hrb87f_RNAi2_R1",  "hrb98de_RNAi1_R1", "hrb98de_RNAi2_R1")
sort(m[grep(pattern="^GFP", x = m )]) # beginning with GFP
## [1] "GFP_RNAi1_R1" "GFP_RNAi2_R1" "GFP_RNAi3_R1" "GFP_RNAi4_R1" "GFP_RNAi5_R1" "GFP_RNAi6_R1"
sort(m[-grep(pattern="^GFP", x = m )]) # do not begin by GFP
##     [1] "caz_RNAi1_R1"     "caz_RNAi2_R1"     "cg1316_RNAi1_R1"  "cg1316_RNAi2_R1"  "cg4612_RNAi1_R1"  "cg4612_RNAi2_R1"  "Dp1_RNAi1_R1"     "Dp1_RNAi2_R1"     "fmr1_RNAi1_R1"    "fmr1_RNAi2_R1"   
##    [11] "hrb87f_RNAi1_R1"  "hrb87f_RNAi2_R1"  "hrb98de_RNAi1_R1" "hrb98de_RNAi2_R1"
c(sort(m[grep(pattern="^GFP", x = m )]),  sort(m[-grep(pattern="^GFP", x = m )])) # ordered columns

【讨论】：

这里没有排序元素。
即使在本例中没有必要，sort 也会对列进行排序。