从数据框到矩阵列名的过去值（在 R 中）

Question

我有一个数据框，行名称中包含单元格 ID，x 列中包含分类。

         x
ACCTTAC  do
ACCGTGG  si
AGTCGGG  si

我还有一个矩阵，其中列为细胞 ID，行为基因。

      ACCTTAC ACCGTGG AGTCGGG
Gene1 4       5       1
Gene2 3       1       0
Gene3 3       3       1

我想粘贴来自数据框的矩阵分类的列名，请参见下面的示例。

       do_ACCTTAC si_ACCGTGG si_AGTCGGG
Gene1  4          5       1
Gene2  3          1       0
Gene3  3          3       1

dput(df) 
structure(list(x = c("do", "si", "si"), row.names = c("ACCTTAC", "ACCGTGG", "AGTCGGG"), class = "data.frame"))

mat = matrix(c(8,4,5,6,7,9,1,8,9),nrow = 3, ncol = 3,byrow = TRUE) 
mat <- matrix(1:9, nrow = 3,dimnames = list(c("Gene1","Gene2","Gene3"), c("ACCTTAC","ACCGTGG","AGTCGGG")))

Answer 1

根据你的数据代码使用colnames和rownames:

dataframe <- data.frame(x = c("do", "si", "si"), 
                        row.names = c("ACCTTAC", "ACCGTGG", "AGTCGGG")) 
mat <- matrix(c(8,4,5,6,7,9,1,8,9),nrow = 3, ncol = 3,byrow = TRUE) 
mat <- matrix(1:9, nrow = 3,dimnames = list(c("Gene1","Gene2","Gene3"),
 c("ACCTTAC","ACCGTGG","AGTCGGG")))

dataframe$col_names <- row.names(dataframe)
for(i in 1:ncol(mat)) {
  for(j in 1:nrow(dataframe)) {
    if(row.names(dataframe)[j] == colnames(mat)[i])
      colnames(mat)[i] = paste0(dataframe$x[j],"_",dataframe$col_names[j])
  }
}

结果是：

> mat
      do_ACCTTAC si_ACCGTGG si_AGTCGGG
Gene1          1          4          7
Gene2          2          5          8
Gene3          3          6          9

从数据框到矩阵列名的过去值（在 R 中）

past values from a data frame to column names of a matrix (in R)

r

matrix

paste

dataframe