【3.2.3】R数据变形--plyr
plyr is a set of tools for a common set of problems: you need to split up a big data structure into homogeneous pieces, apply a function to each piece and then combine all the results back together. For example, you might want to:
更多阅读:
http://www.cnblogs.com/cloudtj/articles/5540913.html
http://www.jianshu.com/p/bfddfe29aa39
revalue
library(plyr) # For the revalue() function
birthwt1$smoke
ddply
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个人公众号,比较懒,很少更新,可以在上面提问题,如果回复不及时,可发邮件给我: tiehan@sina.cn