[R] Request

[Ghosh Mini]

Dear all,

I am trying to learn R.
Is it possible to find the mean of some rows (of some table) and to put it
in new table.

For example we have following table

         date      x      y      z
1  05-23-2001      7      1      3
2  05-24-2001      8      4      5
3  05-24-2001      6      0      0
4  05-24-2001     26      2      6
5  06-19-2001      0      7      0
6  06-19-2001      5      0      2


and I want to make the table

         date      x      y      z
1  05-23-2001
2  05-24-2001      (mean values for each day's)
6  06-19-2001

Is it possible to do this using R???

If possible pl. help me. Thanking you.

Regards,
mini