1、r语言strsplit用于分割字符串
创建测试数据
> test <- "aa bb cc dd ee ff" ##创建测试数据 > test [1] "aa bb cc dd ee ff" > class(test) ## 测试数据为字符 [1] "character"
2、按照指定分隔符拆分字符串
> a <- strsplit(test,split = " ") ##制动分隔符为空格进行拆分数据 > a [[1]] [1] "aa" "bb" "cc" "dd" "ee" "ff" > class(a) ## 分割后的数据类型为列表 [1] "list"
> b <- strsplit(test,split = "") ## 分隔符设为空，则拆分每一个字符 > b [[1]] [1] "a" "a" " " "b" "b" " " "c" "c" " " "d" "d" " " "e" "e" " " "f" [17] "f"
> test <- "aa,bb,cc,dd,ee!ff!gg" ##重新创建测试数据 > strsplit(test,split = ",") ##指定分隔符为","进行拆分 [[1]] [1] "aa" "bb" "cc" "dd" "ee!ff!gg" > strsplit(test,split = "!") ##指定分隔符为"!"进行拆分 [[1]] [1] "aa,bb,cc,dd,ee" "ff" "gg"
> test <- "aa,bb,cc,dd,ee!ff!gg" ##重新创建测试数据 > strsplit(test,split = ",") ##指定分隔符为","进行拆分 [[1]] [1] "aa" "bb" "cc" "dd" "ee!ff!gg" > strsplit(test,split = "!") ##指定分隔符为"!"进行拆分 [[1]] [1] "aa,bb,cc,dd,ee" "ff" "gg"
> test <- "aa.bb.cc.dd.ee" ##同上 > strsplit(test,split = ".") [[1]] [1] "" "" "" "" "" "" "" "" "" "" "" "" "" "" > strsplit(test,split = ".",fixed = t) [[1]] [1] "aa" "bb" "cc" "dd" "ee"
3、指定输出结果为向量
> test <- "aa,bb,cc,dd,ee" ##生产测试数据 > a <- strsplit(test,split = ",") > a [[1]] [1] "aa" "bb" "cc" "dd" "ee" > class(a) [1] "list" > b <- unlist(strsplit(test,split = ",")) ## 加unlist函数 > b [1] "aa" "bb" "cc" "dd" "ee" > class(b) [1] "character"
