如何在数据框中重新排列列？ [英] How does one reorder columns in a data frame?

问题描述

如何更改此输入（顺序为：时间，入，出，文件）：

How would one change this input (with the sequence: time, in, out, files):

Time   In    Out  Files
1      2     3    4
2      3     4    5

输出（文件中的时间，时间，文件）？

To this output (with the sequence: time, out, in, files)?

Time   Out   In  Files
1      3     2    4
2      4     3    5

---

R数据：

---

Here's the dummy R data:

table <- data.frame(Time=c(1,2), In=c(2,3), Out=c(3,4), Files=c(4,5))
table
##  Time In Out Files
##1    1  2   3     4
##2    2  3   4     5

推荐答案

四列如此 df [，c（1,2,3,4）] 。
注意第一个逗号表示保留所有行，1,2,3,4表示列。

Your dataframe has four columns like so df[,c(1,2,3,4)]. Note the first comma means keep all the rows, and the 1,2,3,4 refers to the columns.

要更改顺序，如上面的问题做 df2 [，c（1,3,2,4）]

To change the order as in the above question do df2[,c(1,3,2,4)]

如果要输出这个文件作为一个csv，做 write.csv（df2，file =somedf.csv）

If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")

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