

Hi there,

This seems like it should be simple. I have a data frame of climate data 
sampled every 10 min. I want to average the entire data frame into 30 
min values (i.e., one value for each half hour).  Functions like 
running.mean give me a moving average but I want to reduce the size of 
the entire frame.. Any ideas how? Cheers!

Example of my data

  timestamp  Voltage LwTempDownelling LwDownwelling LwDownwelling_min LwDownwelling_max LwTempUpwelling
1 2011-11-01 00:00:00 2.732447            17.30          30.0              14.0              39.5           17.83
2 2011-11-01 00:10:00 2.731534            17.46          15.3              11.1              24.6           17.95
3 2011-11-01 00:20:00 2.731368            17.43          28.7              24.6              30.7           17.93
4 2011-11-01 00:30:00 2.730703            17.36          40.4              29.8              43.5           17.86
5 2011-11-01 00:40:00 2.729567            17.26          41.6              40.5              42.6           17.76
6 2011-11-01 00:50:00 2.728976            17.16          39.7


-M.B


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