如何将几天分成几周？ [英] How can I group days into weeks?

问题描述

编辑：周应该是日期范围内的星期索引而不是在一年内。我对于歧义感到歉意。

解决方案

您是否只想要自第一条记录以来完成的7天间隔的数量？

  dvec<  -  as.Date（2001-04-01）+ 0:90 
 dweek<  -  as.numeric（dvec-dvec [1]）％/％7 
 dweek [1:21] 
＃[1] 0 0 0 0 0 0 0 1 1 1 1 1 1 1 2 2 2 2 2 2 2 
  

In R, how can I associate between a vector of dates (days) and weeks?

Edit: "weeks" should be the week index within the date range and not within the year. My apologies for the ambiguity.

解决方案

Do you just want the number of completed 7 day intervals since the first record?

dvec <- as.Date("2001-04-01")+0:90
dweek <- as.numeric(dvec-dvec[1]) %/% 7
dweek[1:21]
# [1] 0 0 0 0 0 0 0 1 1 1 1 1 1 1 2 2 2 2 2 2 2

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