将 row.names 从 num 更改为 chr

Question

我在 R 中有一个 data.frame，row.names 是一个字符，我希望它们是数字。我试图找到与相同的问题，但它不起作用。

这是我的代码：

attr(DF1, "row.names") 
[1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12" "13" "14" "15" "16" "17" "18" "19" "20"

在我执行以上链接后：

DF1$id <- as.integer(row.names(DF1)) 
DF1[order(DF1$id), ]

我得到相同的结果：

attr(DF1, "row.names") 
[1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "10" "11" "12" "13" "14" "15" "16" "17" "18" "19" "20"

我希望结果与数据帧 D2 中的结果相同：

attr(DF2, "row.names") 
[1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20

Answer 1

从帮助页面 ?rownames 它说（强调我的）

For a data frame, value for rownames should be a character vector of non-duplicated and non-missing names (this is enforced), and for colnames a character vector of (preferably) unique syntactically-valid names. In both cases, value will be coerced by as.character, and setting colnames will convert the row names to character.

你可以像这样把它们变成一个整数。

df <- data.frame(x = 1:3)
rownames(df) <- as.character(5:7)
attr(df, "row.names") 
#> [1] "5" "6" "7"

rownames(df) <- as.integer(rownames(df))
attr(df, "row.names")
#> [1] 5 6 7

请注意 row.names 总是 return 一个字符向量。参见 ?row.names。

row.names(df)
#> [1] "5" "6" "7"

将 row.names 从 num 更改为 chr

Change row.names from num to chr

row

r

names

dataframe