
Hi, All.


I have a data frame with the part as :

.....
142    2006-02-22 16:28:18  useractivity_act       8         0
143    2006-02-22 16:28:26                 4            2         0
144    2006-02-22 16:28:28                 3            3         0
145    2006-02-22 16:28:31                 4            4         1
146    2006-02-22 16:28:35                 3          159        0
147    2006-02-22 16:31:14 useractivity_idle        0         0
1421   2006-02-22 16:28:18  useractivity_act      8         0
1431   2006-02-22 16:28:26                 4            2         0
1441   2006-02-22 16:28:28                 3            3         0
1451   2006-02-22 16:28:31                 4            4         0
1461   2006-02-22 16:28:35                 3          159        25
1471   2006-02-22 16:31:14 useractivity_idle        0         0
....

I want to merge the above as 
142    2006-02-22 16:28:18  useractivity_act       8         0

143    2006-02-22 16:28:26                 4            2         0

144    2006-02-22 16:28:28                 3            3         0

145    2006-02-22 16:28:31                 4            4         1

146    2006-02-22 16:28:35                 3          159       25

147    2006-02-22 16:31:14 useractivity_idle        0         0

How should I do`??
Thanks.

Tammy

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