在R中的整个data.frame上应用mgsub函数

Question

我经常使用充满特殊字符（例如á，ľ，š，č，ť，ž，ý，á，í，é等）的表格。我发现了一个非常有用的函数mgsub，它可以同时进行多个字符串替换。我在矢量上表现很好，但是我正在努力将哪个函数应用于整个数据帧。

功能mgsub的工作方式如下：

library(mgsub)
mgsub::mgsub("...A čo i tam dušu dáš v tom boji divokom: Mor ty len, a voľ nebyť, ako byť otrokom.",
             pattern = c(".","A","č","š","á",":",",","ľ","ť","M"," "),
         replacement = c("","a","c","s","a","","","","t","m",""), fixed = TRUE)
[1] "acoitamdusudasvtombojidivokommortylenavonebytakobytotrokom"

但是如何将此功能应用于整个data.frame？例如在此data.frame上...

my.df <- data.frame(v1 = c("...A čo i tam dušu","dáš v tom boji"),
                    v2 = c("divokom:","Mor ty len,"),
                    v3 = c("a voľ nebyť,","ako byť otrokom."))

                  v1          v2               v3
1 ...A čo i tam dušu    divokom:     a voľ nebyť,
2     dáš v tom boji Mor ty len, ako byť otrokom.

我尝试过膝但是它只给出错误...

data.frame(lapply(my.df, mgsub::mgsub,
                  pattern = c(".","A","č","š","á",":",",","ľ","ť","M"," "),
                  replacement = c("","a","c","s","a","","","","t","m",""), fixed = TRUE))
Error in nchar(string) : 'nchar()' requires a character vector

欢迎提出任何建议。

Answer 1

问题是列为factor，mgsub需要输入character。根据?mgsub

字符串-寻求替换的字符向量

---

将所有列都转换为character类

my.df[] <- lapply(my.df, as.character)

或使用type.convert

my.df <- type.convert(my.df, as.is = TRUE) 

或者在创建stringsAsFactors = FALSE时使用data.frame作为data.frame中的默认选项是stringsAsFactors = TRUE

my.df <- data.frame(v1 = c("...A čo i tam dušu","dáš v tom boji"),
                    v2 = c("divokom:","Mor ty len,"),
                    v3 = c("a voľ nebyť,","ako byť otrokom."), 
         stringsAsFactors = FALSE)