r - 将行移到表格顶部

Question

我想知道是否可以将一行从表的底部移动到顶部。当我使用到目前为止的代码时，

dt[nrow(dt)+1,] <- rbind(c("","","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","1X","2X","6X","3X",""), dt)

table
使用此代码，我在表格底部获得了一个新行。如果我将“+1”更改为“-22”，该行将移至 table 2 的顶部.如果我进行此更改，则会从表格底部删除一行。任何有关为什么会发生这种情况的帮助将不胜感激。

Answer 1

有几种方法，但这里有两个简单的方法:

a <- data.frame(x = 1:10, y = 20:29)
a <- a[c(10,1:9),]
a

##Or

a <- data.frame(x = 1:10, y = 20:29)
a <- rbind(a[10,],a[1:9,])
a