if else
我正在以这种方式初始化从类 Person 派生的类 Student 和 Prof 的静态成员变量,但它显示一个错误:
words <- unlist(strsplit(tweets$text, split=" "))
hashtags <- words[startsWith((words), "#")]
hashtag_list <- c("#somehashtags1", "#somehashtags2", "#somehashtag2")
interesting_hashtags <- hashtags[hashtags %in% hashtag_list]
V(graph)$hashtags <- interesting_hashtags