[R] Data Parameter extract

[joeman3285]

Hi, 
So I have a set of data, hourly temperature, where each temperature is set
up like this:

Time     Temp
1.04        8
1.08        10

etc.  Where "1" corresponds to a day (say monday is "1", tuesday is "2") and
the decimal value corresponds to an the hour of the day.   

I have several thousand of these readings over several months.  What I would
like to do is extract daily minimum temperatures from this data set.  Is
this possible to do with R?  

I'm pretty new to the use of R and have only a basic understanding of how it
all works.

I appreciate any help.

-joe
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