Question

我有一个表格

的data.table

   nrow    V1      V2        V3      V4        V5  V6 V7                  V8
 1:    1 chr20     C4b   6382078     C4b   6381944 reg  - Thymus_M_GSM1328751
 2:    2  chr8    Rpl4  68832532    Rpl4  68832743 reg  + Thymus_M_GSM1328751

我想将列命名为（“Chromosome”，“Start_Gene”，“startPosition”，“End_gene”，“endPosition”，“RNAtype”，“strand”，“replicate”）。我试过了：

ratData <- ratData[, by= list("Chromosome", "Start_Gene","startPosition", "End_gene", "endPosition", "RNAtype", "strand", "replicate")]

但它不起作用。我也尝试过键而不是“by”。

我该怎么做？

Answer 1

您可以使用setnames功能更改列名称。

setnames(ratData, c("nrow", "Chromosome", "Start_Gene","startPosition", "End_gene", 
                    "endPosition", "RNAtype", "strand", "replicate"))

以下是一些变体：

setnames(ratData, 
         paste0("V", 1:8), # i.e. c("V1", "V2", ..., "V8")
         c("Chromosome", "Start_Gene","startPosition", "End_gene", 
           "endPosition", "RNAtype", "strand", "replicate"))

setnames(ratData, 
         2:9,
         c("Chromosome", "Start_Gene","startPosition", "End_gene", 
            "endPosition", "RNAtype", "strand", "replicate"))

Answer 2

'names'功能也有效：

names(ratData)
[1] "nrow" "V1"   "V2"   "V3"   "V4"   "V5"   "V6"   "V7"   "V8"  

names(ratData) = c("nrow", "Chromosome", "Start_Gene","startPosition", "End_gene", "endPosition", "RNAtype", "strand", "replicate")

ratData
   nrow Chromosome Start_Gene startPosition End_gene endPosition RNAtype strand           replicate
1:    1      chr20        C4b       6382078      C4b     6381944     reg      0 Thymus_M_GSM1328751
2:    2       chr8       Rpl4      68832532     Rpl4    68832743     reg      0 Thymus_M_GSM1328751

在R中为data.table命名列

2 个答案: