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法律研究如何在 R 向量中分离第一个文本值和剩下的文本值？
要分离 R 中的第一个文本值和其余文本值，我们可以按照以下步骤进行 −
首先，创建一个向量。
然后，使用来自 stringr 包的 str_split 函数分离第一个文本值和其余文本值。
示例
创建向量
让我们创建一个如下所示的向量 −
x<-sample(c("Data","Machine
Learning","Python","R","Java","SQL","Tableu"),25,replace=TRUE)
x输出
执行上述脚本后，将生成以下输出（此输出因随机性而异） −
[1] "Python" "Python" "Machine
Learning" [4] "Python" "Java" "Python" [7] "Java" "SQL" "R" [10] "Data" "Tableu" "Python" [13] "Machine
Learning" "R" "Machine
Learning" [16] "Machine
Learning" "Java" "Tableu" [19] "Data" "Tableu" "R" [22] "Java" "Machine
Learning" "Python" [25] "Tableu"
提取字符串向量中的第一个值和其余文本
使用 stringr 包的 str_split 函数提取向量 x 中每个元素的第一个文本值和其余文本 −
x<-sample(c("Data","Machine
Learning","Python","R","Java","SQL","Tableu"),25,replace=TRUE)
library(stringr)
str_split(x,"(?<=.{1})",2)输出
[[1]] [1] "D" "ata" [[2]] [1] "T" "ableu" [[3]] [1] "M" "achine Learning" [[4]] [1] "J" "ava" [[5]] [1] "J" "ava" [[6]] [1] "P" "ython" [[7]] [1] "J" "ava" [[8]] [1] "M" "achine Learning" [[9]] [1] "R" "" [[10]] [1] "R" "" [[11]] [1] "R" "" [[12]] [1] "M" "achine Learning" [[13]] [1] "P" "ython" [[14]] [1] "T" "ableu" [[15]] [1] "M" "achine Learning" [[16]] [1] "J" "ava" [[17]] [1] "J" "ava" [[18]] [1] "D" "ata" [[19]] [1] "T" "ableu" [[20]] [1] "D" "ata" [[21]] [1] "T" "ableu" [[22]] [1] "T" "ableu" [[23]] [1] "T" "ableu" [[24]] [1] "T" "ableu" [[25]] [1] "T" "ableu"
更新日期：11-Nov-2021
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