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2008 Jun 19
2
Advanced Filtering problem
http://www.nabble.com/file/p18018170/subdata.csv subdata.csv
I've attached 100 rows of a data frame I am working with.
I have one factor, id, with 27 levels. There are two columns of reference
data, x and y (UTM coordinates), one column "date" in POSIXct format, and
one column "diff" in times format (chron package).
What I am trying to do is as follows:
For each day