("Social Network") [1] 14 字符串的拼接 paste(),sep 参数为连接的字符: > paste("Social", "Network", sep = "-") [1] "Social-Network " 字符串的分割 strsplit(): > strsplit("Social-Network", "-") [[1]] [1] "Social" "Network" 字符串的截取 substr(),
("Social Network") [1] 14 字符串的拼接 paste(),sep 参数为连接的字符: > paste("Social", "Network", sep = "-") [1] "Social-Network " 字符串的分割 strsplit(): > strsplit("Social-Network", "-") [[1]] [1] "Social" "Network" 字符串的截取 substr(),
Social-network science is much newer than epidemiology, and its eventual impact on medicine remains uncertain
social-network:通过好友点赞、关注关系、通信录关系等,找到社交链上的其他人,然后通过他们来召回item。原则就是好友喜欢的item,大概率也会喜欢,物以类聚人以群分嘛。