在读取文件时指定行名称 [英] Specifying row names when reading in a file

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问题描述

我有一个包含行名称的 .txt 文件。

如果你使用 read.table()方法,你可以使用(或其中一个,例如 read.csv()),那么很容易修复是更改调用:

  read.table(file =foo.txt,row.names = 1,....)

其中 .... 是您需要/使用的其他参数。 row.names 参数接受从中获取行名称的数据文件的列号。它不需要是第一列。有关详细信息,请参阅?read.table



如果已经有R中的数据,或者来自另一个路由,只要设置 rownames 属性并从对象中删除第一个变量(假设 obj 是您的对象)

  rownames(obj)<  -  obj [,1] ## set rownames 
obj< - obj [,-1] ##删除第一个变量


I have a .txt file that contains row names. However, R set the row names as the first column.

解决方案

If you used read.table() (or one of it's ilk, e.g. read.csv()) then the easy fix is to change the call to:

read.table(file = "foo.txt", row.names = 1, ....)

where .... is other arguments you needed/used. The row.names argument take the column number of the data file from which to take the row names. It need not be the first column. See ?read.table for details/info.

If you already have the data in R and can;t be bothered to re-read it, or is came from another route, just set the rownames attribute and remove the first variable from the object (assuming obj is your object)

rownames(obj) <- obj[, 1] ## set rownames
obj <- obj[, -1]          ## remove the first variable

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