[R] Subset a datafram according to time

[Jim Holtman]

In the first line of dataframe 3, I don't see where the value of 2.456 for ObsrG came from.  Can you give us a hint of how that was computed?

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On Feb 9, 2012, at 21:05, NickNz125 <nickthomas125 at gmail.com> wrote:

> I want the combine and align by time DATAFRAME1 with DATAFRAME2.  DF1 is
> second observations and DF2 6 minutes observations want to extract the ObsrG
> data from DF1 to match the times in DF2. Therefore getting DF3 with
> Observations (Obsrg) extracted from DF1 to match the times in DF2.
> 
> DATAFRAME1
> Date  Time  ObsrG 
> 02/08/2011 00:00:01   1.167     
> 02/08/2011 00:00:02   1.788     
> 02/08/2011 00:00:03   1.677     
> 02/08/2011 00:00:04   1.313     
> 02/08/2011 00:00:05    1.110     
> 02/08/2011 00:00:06    1.248         
> 02/08/2011 00:00:07    1.187
> 
> DATAFRAME2
> Date  Time  Obsr 
> 02/08/2011 00:00     1.154     
> 02/08/2011 00:06     1.041     
> 02/08/2011 00:12     1.090     
> 02/08/2011 00:18     1.093     
> 02/08/2011 00:24     1.100     
> 02/08/2011 00:30     1.098         
> 02/08/2011 00:36     1.177    
> 
> DATAFRAME 3
> 
> Date  Time  Obsr ObsrG
> 02/08/2011 00:00     1.154    2.456 
> 02/08/2011 00:06     1.041     2.341
> 02/08/2011 00:12     1.090     1.893
> 02/08/2011 00:18     1.093     1.783
> 02/08/2011 00:24     1.100     1.689
> 02/08/2011 00:30     1.098    1.768     
> 02/08/2011 00:36     1.177    1.892
> 
> 
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