R：如何根据另一个重排序矩阵，数据框架或向量的行 [英] R: How can I reorder the rows of a matrix, data.frame or vector according to another one

问题描述

test1 <- as.matrix(c(1, 2, 3, 4, 5))
row.names(test1) <- c("a", "d", "c", "b", "e") 

test2 <- as.matrix(c(6, 7, 8, 9, 10))
row.names(test2) <- c("e", "d", "c", "b", "a") 

  test1
  [,1]
a    1
d    2
c    3
b    4
e    5

 test2
  [,1]
e    6
d    7
c    8
b    9
a   10

如何重新排序test2所以这些行的顺序与test1相同？例如：

How can I reorder test2 so that the rows are in the same order as test1? e.g:

 test2
  [,1]
a    10
d    7
c    8
b    9
e    6

我尝试使用重排序功能：reorder test1，test2），但我找不到正确的语法。我看到reorder需要一个向量，我在这里使用一个矩阵。我的真实数据有一​​个字符向量，另一个是数据框。我认为数据结构对于上面这个例子来说并不重要，我只需要帮助语法，并且可以适应我的真正问题。

I tried to use the reorder function with: reorder (test1, test2) but I could not figure out the correct syntax. I see that reorder takes a vector, and I'm here using a matrix. My real data has one character vector and another as a data.frame. I figured that the data structure would not matter too much for this example above, I just need help with the syntax and can adapt it to my real problem.

推荐答案

test2 <- test2[rownames(test1),,drop=FALSE]

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