... ## 默认分隔符print "\n";print join " ! ", split /\s+/; ## 正则匹配空格print "\n";print join " | ", split ' '; ## 直接量空格print "\n";##### 输出结果## a | b | c | d | e## ! a ! b ! c ! d ! e## a | b | c | d | e
默认分隔符split和直接量分隔符split '...
1、转换与合并left_join(a, b, by = “x1”): 向数据集a中加入匹配的数据集b记录(行)。right_join(a, b, by = “x1”): 向数据集b中加入匹配的数据集a记录。inner_join(a, b, by = “x1”): 合并数据。仅保留匹配的记录。full_join(a, b, by = “x1...