1. case_when() 函数 2. case_match() 函数 3. consecutive_id() 函数 4. 其他函数的更新 dplyr 1.1.0 版本发布 2023/01/31 日,R 语言数据处理利器 dplyr 包的 1.1.0 版本正式发布。 对于这次更新,RStudio 官网十分重视,dplyr 包的开发者之一 Davis Vaughan,亲自在 tidyverse 博客官网www.tidyverse...
case_match()是 SQL "simple"CASE WHEN语句的 R 等效项。 连接至case_when() case_when()在公式左侧使用逻辑表达式,而case_match()使用值与.x进行匹配。下面的两条语句大致是等价的: case_when( x %in% c("a","b") ~1, x %in%"c"~2, x %in% c("d","e") ~3)case_match( x, c("a","...
1、match()函数 match()函数用于判断某一字符向量是否与另一字符向量中的元素匹配,其基本语法:match(x, table, nomatch=NA_integer_, incomparables=NULL)。其中,x与table为需要进行匹配的元素,函数的返回值为元素x在元素table中的位置,nomatch为如果两元素不...
k = match(a,b);k #match(a,b)的意思是a里的每个元素在b的第几个位置上。 #是b的下标,可以给b取子集,也可以给与b对应的其他向量取子集。 colnames(y) = x$ID[k] ## (2)一步解法 load("matchtest.Rdata") colnames(y) = x$ID[match(colnames(y),x$file_name)] ## (3)放弃match的解法 ...
• str_view(string, pattern, match): 在Viewer 窗口输出(正则表达式)模式匹配结果 • word(string, start, end, sep = ”“): 从英文句子中提取单词 • str_wrap(string, width = 80, indent = 0, exdent =0): 调整段落格式 4. 数据连接 4.1 行合并与列合并 我们已经学会了使用rbind进行行合并...
"fizz" "46" "47" "48" "buzz" "fizz"#> [51] "51" "52" "53" "54" "fizz" "buzz" "57" "58" "59" "fizz"#> [61] "61" "62" "buzz" "64" "fizz" "66" "67" "68" "69" "fizz"# If none of the cases match and no `.default` is supplied, NA is used:case_when(...
regex(pattern, ignore_case = FALSE, multiline = FALSE, comments = FALSE, dotall = FALSE, …):默认使用正则表达式 boundary(type = c(“character”, “line_break”, “sentence”, “word”), skip_word_none = TRUE, …):Match boundaries between things. ...
MatchIt 3.0.2 https://cran.r-project.org/web/packages/MatchIt/index.html matchmaker 0.1.1 https://cran.r-project.org/web/packages/matchmaker/index.html Matrix 1.2-12 https://cran.r-project.org/web/packages/Matrix/index.html matrixcalc 1.0-3 https://cran.r-project.org/web/packages/matrix...
The name is a string of 1 to 51 case-sensitive characters without spaces. The string cannot be all numerals. When double quotation marks are used around the string, spaces are allowed in the string. whole-match Indicates complete matching. That is, all the communities in the command must ...
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