R语言使用substring函数自定义指定起始位置(first)参数和终止位置(last)参数抽取字符串中的指定范围的字符串子序列 x1 <- "hello this is a string" # Create example vector substring(x1, first = 7, last = 13) # Apply substring # "this is" > x1 <- "hello this is a string" > >...
pat1 <-"^(.*?)\\((.*?)\\)"tab1 <- restab %>%## 将三列合并为一列,结果为字符型向量reduce(c) %>%## 去掉空格和换行符,结果为字符型向量stringr::str_replace_all("[[:space:]]","") %>%## 提取公司简称和代码到一个矩阵行,结果为字符型矩阵stringr::str_match(pat1) tab <- t...
1.7 判断语句和循环语句: #if ... else#switcha <- 4x<-switch( a,"a","b","c","d","e")print(x)#if no in range ,return NULL #three ways: repeat,while,for#001 repeat:never get out until TRUE or breakn <- 1repeat{print(1) n<- n+1if(n>5){break} }#002 whilewhile(i<7...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 ort(rond(x=prop.tbl(x=tae(vpst$type,eNA="ifany")),digis=4)) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 dott(x=sort(t),xlim=c(-0.05,1.05),cex=1.5) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 t=prole(x=table(ts$...
}// 得到 beanNameString beanName=key.substring(0,separatorIndex);// 得到属性值String beanProperty=key.substring(separatorIndex+1);this.beanNames.add(beanName);// 替换applyPropertyValue(factory,beanName,beanProperty,value);if(logger.isDebugEnabled()){logger.debug("Property '"+key+"' set to ...
if (localLOGV) Slog.v(TAG, "Performing launch of " + r); if (localLOGV) Slog.v( TAG, r + ": app=" + app + ", appName=" + app.getPackageName() + ", pkg=" + r.packageInfo.getPackageName() + ", comp=" + r.intent.getComponent().toShortString() + ", dir=" + r....
get_substring_every_n <- function(str, n) { if (n <= 0) { stop("n must be a positive integer") } substrings <- seq(1, nchar(str), by = n) return(substr(str, substrings, substrings + n - 1)) } # 调用函数 substrs <- get_substring_every_n("abcdefgh", 3) print(subs...
string concatenation, padding, wrapping, substring extraction, pattern searching (e.g., with Java-like regular expressions), collation and sorting, random string generation, case mapping and folding, string transliteration, Unicode normalisation,
Restricted Damerau-Levenshtein distance (weighted, a.k.a. Optimal String Alignment); Full Damerau-Levenshtein distance (weighted); Longest Common Substring distance; Q-gram distance cosine distance for q-gram count vectors (= 1-cosine similarity) ...
Delete substring in string giving that substring Delete/remove a Visual C# class Deleting a Table from Database (MS Access) Deleting columns from multidimensional array Deleting rows conditionally from a DataTable Demonstrating Array of Interface Types (using runtime polymorphism) in C# dependecy walke...