[R] pick time intervalls

[jerzack]

Hello,
as an R beginner I have a question concerning the following data set:

nr     date       time    V1  V2  V3  V4  V5  V6
...
2828 26/08/05 20:00  60  38  55  58  53  56
2829 26/08/05 21:00  58  34  54  49  45  53
2830 26/08/05 22:00  56  35  52  51  46  47
2831 26/08/05 23:00  56  35  50  45  46  38
2832 27/08/05 00:00  61  34  49  42  47  32
2833 27/08/05 01:00  62  38  52  49  48  36
2834 27/08/05 02:00  64  39  51  49  50  42
2835 27/08/05 03:00  63  40  49  46  49  33
2836 27/08/05 04:00  58  37  47  48  51  20
...

How can I access values at a certain time intervall every day.
For example I would like to calculate the mean of the V1 values for the
times 02:00 - 04:00 every day.
Thank you very much for your help!
jeremy
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