Reordering the columns in a data frame

weixin_34029680

于 2015-04-28 19:20:00 发布

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本文介绍如何使用R语言重新排列数据框中的列顺序。包括按列号和列名两种方式，并提供具体示例。

Problem

You want to do reorder the columns in a data frame.

Solution

# A sample data frame
data <- read.table(header=TRUE, text='
    id weight   size
     1     20  small
     2     27  large
     3     24 medium
')

# Reorder by column number
data[c(1,3,2)] #> id size weight #> 1 1 small 20 #> 2 2 large 27 #> 3 3 medium 24 # To actually change `data`, you need to save it back into `data`: # data <- data[c(1,3,2)] # Reorder by column name data[c("size", "id", "weight")] #> size id weight #> 1 small 1 20 #> 2 large 2 27 #> 3 medium 3 24