如何在 R 中从字符串中提取字符?
r programmingserver side programmingprogramming
我们可以使用 stringi 包中的 stri_sub 函数。
示例
> x<- "TutorialsPoint is the largest online library for best tutorials" > x [1] "TutorialsPoint is the largest online library for best tutorials" > library(stringi) > stri_sub(x,1,9) [1] "Tutorials" > stri_sub(x,1,-20) [1] "TutorialsPoint is the largest online library" > stri_sub(x,-14,-1) [1] "best tutorials" > stri_sub(x,-41,-1) [1] "largest online library for best tutorials"
