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按行排序另一个数据帧，保留r中的顺序

r sorting dataframe

按行排序另一个数据帧，保留r中的顺序,r,sorting,dataframe,R,Sorting,Dataframe,我有两个数据帧 daf <- data.frame (A = 1:10, J = 1:10, E = 11:20, D = 21:30, C= 41:50, B = 61:70, L = 3:12) df2 <- data.frame (nam = c("A", "B", "C", "E", "D"), sn = 1:5) > df2 nam sn 1 A 1 2 B 2 3 C 3 4 E 4 5 D 5 > daf

我有两个数据帧

daf <- data.frame (A = 1:10, J = 1:10, E = 11:20, D = 21:30, C= 41:50, B = 61:70, L = 3:12)
 df2 <- data.frame (nam = c("A", "B", "C", "E", "D"), sn = 1:5)


    > df2
  nam sn
1   A  1
2   B  2
3   C  3
4   E  4
5   D  5

> daf
    A  J  E  D  C  B  L
1   1  1 11 21 41 61  3
2   2  2 12 22 42 62  4
3   3  3 13 23 43 63  5
4   4  4 14 24 44 64  6
5   5  5 15 25 45 65  7
6   6  6 16 26 46 66  8
7   7  7 17 27 47 67  9
8   8  8 18 28 48 68 10
9   9  9 19 29 49 69 11
10 10 10 20 30 50 70 12

daf-daf
A J E D C B L
1   1  1 11 21 41 61  3
2   2  2 12 22 42 62  4
3   3  3 13 23 43 63  5
4   4  4 14 24 44 64  6
5   5  5 15 25 45 65  7
6   6  6 16 26 46 66  8
7   7  7 17 27 47 67  9
8   8  8 18 28 48 68 10
9   9  9 19 29 49 69 11
10 10 10 20 30 50 70 12
我只想选择df2的nam中列出的变量名。我想维持df2的秩序

daf.n <- colnames(daf)
df2.n <- df2[,1]
daf[df2.n%in%colnames(daf),] 
    A  J  E  D  C  B  L
1   1  1 11 21 41 61  3
2   2  2 12 22 42 62  4
3   3  3 13 23 43 63  5
4   4  4 14 24 44 64  6
5   5  5 15 25 45 65  7
6   6  6 16 26 46 66  8
7   7  7 17 27 47 67  9
8   8  8 18 28 48 68 10
9   9  9 19 29 49 69 11
10 10 10 20 30 50 70 12

daf.n不需要
%in%
：


 daf <- data.frame (A = 1:10, J = 1:10, E = 11:20, D = 21:30, C= 41:50, B = 61:70, L = 3:12)
 df2 <- data.frame (nam = c("A", "B", "C", "E", "D"), sn = 1:5)
 daf[,as.character(df2$nam)]



daf