Several folks pointed out the problem is most likely that a column of
data is being read in as a factor.
I prefer to solve this by setting as.is=TRUE as one of the arguments to
read.table() (unless I am mis-remembering and it needs to be set to
FALSE :-) ). The point is to tell the read function to read character
strings in as character strings, rather than converting them into factors.
After that you can convert the offending column with as.numeric or one
of the date-conversion functions (if the input is date/time strings)
Carl
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