[R] Average for Huge file

[Hassan]

Hi, I am a PhD student. Basic knowing R. I have 2 datw files 1st 5min
intervals & the 2nd 1min for a month. My taske is to have 15min average for
all.
This how data look;
Date                                     Pm      FF         LL           KK   
HH     NN        Ww        DD
01/01/2012 00:00:00          349     120      10             8     1178  
1292    2005      762
01/01/01/2012 00:00:05     356     119      12             7     1167   1289    
1992    778
01/01/2012 00:00:10           360     115       15           8      189     
1302     2010   770

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