R语言使用gsub函数进行全局多个字符串替换、gsub函数将所有匹配到的字符串模式替换为指定的字符串 x <- "aaabbb" # Example character string gsub("a|b", "c", x) # gsub function with multiple patterns # "cccccc" > x <- "aaabbb" > # Example character string> > gsub("a|b", "...
str_replace_all(fruits, "a", NA_character_) # [1] NA NA NA str_replace_all(fruits,c("one" = "1", "two" = "2", "three" = "3")) # [1] "1 apple" "2 pears" "3 bananas" 3.str_各函数功能 以上是我个人认为比较常用的stringr包中的函数。以下是more。 3.1字符串拼接函数 str...
gsub()function replaces all matches of a string, if the parameter is a string vector, returns a string vector of the same length and with the same attributes (after possible coercion to character). Elements of string vectors which are not substituted will be returned unchanged (including any ...
str_replace_all替换每个字符串匹配到的所有 1. 2. 向量结合str_replace_all()同时执行多个替换: 回溯引用分组:交换第二个单词和第三个单词的顺序: 本来是 \1 \2 \3 通过设置,顺序交换 \1 \3 \2 sentences %>% str_replace("([^ ]+) ([^ ]+) ([^ ]+)", "\\1 \\3 \\2") %>% head(...
pks = c("tidyr","dplyr","stringr") for(g in pks){ if(!require(g,character.only = T)) install.packages(g,ask = F,update = F) } 玩转隐式循环 apply 0 向量里有两个东西,一个是正文,一个是名字,虽然是向量,但他的每个 元素可以拥有名字 ...
raw %>% mutate(across(.cols = everything(), .fns = as.character))大家把握住一个原则就是列的生成转换就是用mutate就行，然后涉及到选择的时候我们一定记得要结合辅助函数“tidyselect” helper functions。要有这个意识。还有一个函数要给大家介绍一下就是coalesce()很多时候我们一个变量有两种测量方式，...
stringr 不是tidyverse 核心 R 包的一部分,故需要使用命令来加载它。 library(tidyverse) library(stringr) 2. 字符串基础 2.1 创建字符串或字符向量 (1)用单引号或双引号来创建字符串。 单引号和双引号在 R中没有区别。一般用双引号。单引号通常用于分...
str1 <- "Each character string in the input is first split into paragraphs\n(or lines containing whitespace only). The paragraphs are then\nformatted by breaking lines at word boundaries. The target\ncolumns for wrapping lines and the indentation of the first and\nall subsequent lines of a ...
Error in .Primitive("sum")("I am a string", ...) : invalid 'type' (character) of argument > rapply(lst2, sum, classes=c('integer'), deflt=-1, how='unlist')a.aa a.ab b.ba 15 40 -1 > rapply(lst2, nchar, classes=c('character'), deflt=as.integer(NA), how='unlist')...
pks = c("tidyr","dplyr","stringr") for(g in pks){ if(!require(g,character.only = T)) install.packages(g,ask = F,update = F) } # 隐式循环 apply(x, margin, fun, ...) #x是数据框或者矩阵 #margin为行则是1,margin为列是2; ...