This error occurs because the "==" comparison operator doesn't allow
comparison of ordered and normal factors:
/df[df5$close_quarter == as.Date("2011-02-01"),]/
Warning message:
In /`[.data.frame`(df, df$close_quarter == as.Date("2011-02-01")/, :
Incompatible methods ("Ops.ordered", "Ops.Date") for "=="
Why should this be a problem -- Isn't this being overly cautious? Can
anyone think of a case where coercing the ordered factor to a normal factor
for comparisons of == would do the wrong thing?
Perhaps this is a question for the developer's section.
Cheers -john mark agosta
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