r 中的翻译（重新编码）错误

这是一个小例子：

X1 <- c("AC", "AC", "AC", "CA", "TA", "AT", "CC", "CC")
X2 <- c("AC", "AC", "AC", "CA", "AT", "CA", "AC", "TC")
X3 <- c("AC", "AC", "AC", "AC", "AA", "AT", "CC", "CA")
mydf1 <- data.frame(X1, X2, X3)

输入数据框

  X1 X2 X3
1 AC AC AC
2 AC AC AC
3 AC AC AC
4 CA CA AC
5 TA AT AA
6 AT CA AT
7 CC AC CC
8 CC TC CA

功能

# Function 
atgc <- function(x) {
 xlate <- c( "AA" = 11, "AC" = 12, "AG" = 13, "AT" = 14,
"CA"= 12, "CC" = 22, "CG"= 23,"CT"= 24,
 "GA" = 13, "GC" = 23, "GG"= 33,"GT"= 34,
 "TA"= 14,  "TC" = 24, "TG"= 34,"TT"=44,
"ID"= 56, "DI"= 56, "DD"= 55, "II"= 66
 )
  x =   xlate[x]
 }
outdataframe <- sapply (mydf1, atgc)
outdataframe
   X1 X2 X3
AA 11 11 12
AA 11 11 12
AA 11 11 12
AG 13 13 12
CA 12 12 11
AC 12 13 13
AT 14 11 12
AT 14 14 14

问题是，AC 的输出不等于 12，而是 11，其他情况类似。简直乱七八糟！

（额外：我也不知道如何摆脱行名。）

只需使用apply并转置：

t(apply (mydf1, 1, atgc))

To use sapply，然后使用：

1. stringsAsFactors=FALSE创建数据框时，即

   mydf1 <- data.frame(X1, X2, X3, stringsAsFactors=FALSE)
   

   （感谢@joran）或

2. 将函数的最后一行更改为：x = xlate[as.vector(x)]