Hello,
my series of dates look like

  [1] "2012-05-30 18:30:00 UTC" "2012-05-30 19:30:00 UTC"
  [3] "2012-05-30 20:30:00 UTC" "2012-05-30 21:30:00 UTC"
  [5] "2012-05-30 22:30:00 UTC" "2012-05-30 23:30:00 UTC"
  [7] "2012-05-31 00:30:00 UTC" "2012-05-31 01:30:00 UTC"
  [9] "2012-05-31 02:30:00 UTC" "2012-05-31 00:30:00 UTC"
 [11] "2012-05-31 01:30:00 UTC" "2012-05-31 02:30:00 UTC"
 [13] "2012-05-31 03:30:00 UTC" "2012-05-31 04:30:00 UTC"
 [15] "2012-05-31 05:30:00 UTC" "2012-05-31 06:30:00 UTC"
 [17] "2012-05-31 07:30:00 UTC" "2012-05-31 08:30:00 UTC"
 [19] "2012-05-31 06:30:00 UTC" "2012-05-31 07:30:00 UTC"
...

I'd like to subset this to four series

1)
  [1] "2012-05-30 18:30:00 UTC" "2012-05-30 19:30:00 UTC"
  [3] "2012-05-30 20:30:00 UTC" "2012-05-30 21:30:00 UTC"
  [5] "2012-05-30 22:30:00 UTC" "2012-05-30 23:30:00 UTC"
  [7] "2012-05-31 00:30:00 UTC" "2012-05-31 01:30:00 UTC"
  [9] "2012-05-31 02:30:00 UTC"

 [10] "2012-05-31 18:30:00 UTC" "2012-05-31 19:30:00 UTC"
...

2)
                                                "2012-05-31 00:30:00 UTC"
-> [1]
 [11] "2012-05-31 01:30:00 UTC" "2012-05-31 02:30:00 UTC" -> [2,3]
 [13] "2012-05-31 03:30:00 UTC" "2012-05-31 04:30:00 UTC"
 [15] "2012-05-31 05:30:00 UTC" "2012-05-31 06:30:00 UTC"
 [17] "2012-05-31 07:30:00 UTC" "2012-05-31 08:30:00 UTC"

 [10] "2012-06-01 00:30:00 UTC"


3)
 [19] "2012-05-31 06:30:00 UTC" "2012-05-31 07:30:00 UTC"
...

so that I can plot data for each of the series separately without e.g. data
at hour  "2012-05-31 02:30:00 UTC"  connecting in the figure to "2012-05-31
00:30:00 UTC"

Basically, cycling through the series with period 9

Thanks for any suggestions/help,
thanks,

Mark

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