在具有 2 列的数据框中执行 gsub答案

【问题标题】：perform gsub in a data frame with 2 columns在具有 2 列的数据框中执行 gsub
【发布时间】：2014-04-16 10:32:19
【问题描述】：

我有 2 列的数据集，我想使用 gsub 清理我的数据集，例如

Data_edited_txt2 <- gsub("(RT|via)((?:\\b\\W*@\\w+)+)", "", Data_edited_txt2$text)
Data_edited_txt2 <- gsub("@\\w+", " ", Data_edited_txt2$text)
Data_edited_txt2 <- gsub("[[:punct:]]", "", Data_edited_txt2$text)

在第二次运行 gsub 时我会得到一个错误：“$ operator is invalid for atomic vectors”，我注意到在运行第一个 gsub 后第二列会消失。

请告知如何执行所有 gsub，但保留第 2 列？

structure(list(text = structure(c(1L, 3L, 7L, 4L, 2L, 5L, 6L), .Label = c("@airasia im searching job", 
"@AirAsia no flight warning for cebu outbound?", "@shazzr1 @AirAsia never mind.. now everyone can fly.", 
"@TigerAir confirmed as having far nastier policies and uncaring customer service than @airasia who I will now fly every time in preference.", 
"@Wingmates Since your taxes is HIGHER than other airlines but your service is really BAD because always change and cancel the flight.", 
"hai MASwings @Wingmates . Bilakah tempoh promosi anda? Saya ingin terbang ke Palawan dengan bajet yang agak rendah :3", 
"One thing I \"like\" about @AirAsia is, DELAY."), class = "factor"), 
created = structure(c(3L, 2L, 1L, 7L, 6L, 4L, 5L), .Label = c("2/2/2014 11:30", 
"2/2/2014 11:32", "2/2/2014 12:18", "24/2/2014 4:03", "29/3/2014 8:21", 
"30/1/2014 16:02", "31/1/2014 8:13"), class = "factor")), .Names = c("text", 
"created"), class = "data.frame", row.names = c(NA, -7L))

【问题讨论】：

您将Data_edited_txt2$text 的替换向量分配给Data_edited_txt2，因此该对象现在仅由单个向量组成。相反，分配给Data_edited_txt2$text

标签： regex r string gsub text-extraction

【解决方案1】：

您覆盖整个数据框，而不是仅覆盖一列。试试这个：

Data_edited_txt2$text <- gsub("(RT|via)((?:\\b\\W*@\\w+)+)", "", Data_edited_txt2$text)
Data_edited_txt2$text <- gsub("@\\w+", " ", Data_edited_txt2$text)
Data_edited_txt2$text <- gsub("[[:punct:]]", "", Data_edited_txt2$text)

【讨论】：