Created
December 15, 2012 02:53
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| #炼金术士成长之路（T1）： http://www.dataanalysis.cn/alchemist/alchemist.html | |
| QQ <- read.csv("http://www.dataanalysis.cn/doc/a/1/qq.csv") | |
| #Solution for 1th question | |
| A1 <- table(QQ$id) | |
| A2 <- sort(A1,decreasing = T) | |
| A2[1:10] | |
| # 7cha18 6cha4376 4cha3875 8cha083 4cha698 1cha65314 | |
| # 1511 1238 1100 695 533 440 | |
| # acha@vip.qq.com 2cha1 5cha80 3cha4233 | |
| # 380 354 304 300 | |
| #Solution for 2th question | |
| Newid <- unique(QQ$id) | |
| N <-vector(length=length(Newid)) | |
| for (i in 1:length(Newid)){ | |
| N[i]<-length(unique(as.Date(QQ[QQ$id==Newid[i],]$time))) | |
| } | |
| Result <- NULL | |
| Result$id<-Newid | |
| Result$num<-N | |
| Result <- as.data.frame(Result) | |
| Result[order(Result$num,decreasing = TRUE),][1:10,] | |
| # id num | |
| # 3 6cha4376 165 | |
| # 5 4cha3875 152 | |
| # 4 7cha18 112 | |
| # 35 acha@vip.qq.com 92 | |
| # 27 4cha698 89 | |
| # 40 2cha1 79 | |
| # 8 8cha083 75 | |
| # 39 1cha457 58 | |
| # 50 1cha59002 53 | |
| # 1 8cha08 50 |
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