On Oct 14, 2010, at 8:56 PM, joeman3285 wrote:
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.
One way that works best is for questions to include data in an R
object. If those values are in a data.frame, dfrm, (and if they're
not, then you need to work through some examples in the Introduction
to R and the Import/Export Manual) then:
dput(head(dfrm, 20)) # would get a version of the data that anyone
could paste into their console.
Still assuming you have this in a data.frame, perhaps:
mintemps <- with( dfrm, tapply( Temp, floor(Time) , min) )
mintemps
I appreciate any help.
-joe
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David Winsemius, MD
West Hartford, CT
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