合併行

Question

我與特定格式的data.frame：

df <- structure(list(Left.align = c("A", "B", "C", "F"), Right.align = c("B", 
"A", "D", "E"), Center.align = c(2, 2, 3, 6)), .Names = c("Left.align", 
"Right.align", "Center.align"), row.names = c(NA, -4L), class = "data.frame") 

df 
    Left.align Right.align Center.align 
1   A   B   2 
2   B   A   2 
3   C   D   3 
4   F   E   6 

我會以除去BA 2，因爲結果是一樣的是AB 2.如何我會在R這麼做嗎？

謝謝！

Answer 1

我們可以sort通過行，然後用duplicated得到一個合理的索引子集數據集的行

df1[!duplicated(t(apply(df1, 1, sort))),]