R - 如何在数据框中替换部分变量字符串

Question

我有一个数据帧df:

var1 var2
"test" "testing"
"esten" "etsen"
"blest" "estten"

现在我要删除df中的所有"t"以获取:

var1 var2
"es" "esing"
"esen" "esen"
"bles" "esen"

我怎么做？

Answer 1

使用 gsub

dat <- c("test", "testing", "esten", "etsen", "blest", "estten")

gsub("t", "", dat)
[1] "es"    "esing" "esen"  "esen"  "bles"  "esen" 

Answer 2

您可以使用gsub并使用sapply每个变量应用它:

df <- data.frame( 
    var1 = c("test","esten","blest"),
    var2 = c("testing","etsen","esttem"))

df2 <- as.data.frame(sapply(df,gsub,pattern="t",replacement=""))
df2
  var1  var2
1   es esing
2 esen  esen
3 bles  esem