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印刷しないのではなく、wkendのデータフレームを作成するにはどうすればよいですか?
wkend<-as.Date(c("2013-01-04","2013-01-05","2013-01-06"),"%Y-%m-%d") while(wkend < "2013-12-27") { wkend <- wkend + 7 print(wkend) }