You may be happy using:
strptime(paste(Date,Time,sep=" "),"%m/%d/%y %H:%M")$hour
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Air Quality Modeler INTERNET: cl...@math.utah.edu
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On Tue, 10 May 2011, Schatzi wrote:
I have a matrix where one column has a date and another column has a time. I
need to delete all times before 6am. I had combined the Date and Time column
into DateTime.
Mat1:
Weight Date Time
7.6 04/28/11 09:03
8.4 04/29/11 03:11
8.6 04/29/11 05:32
8.6 04/29/11 09:53
1.4 05/01/11 19:52
I tried just picking up the time:
as.POSIXct(Mat1$Time, format = "%H:%M")
but this assigns the time value today's date.
The final matrix should look like:
Weight Date Time
7.6 04/28/11 09:03
8.6 04/29/11 09:53
1.4 05/01/11 19:52
-----
In theory, practice and theory are the same. In practice, they are not - Albert
Einstein
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