Re: [R] Finicky factor comparison operators

MIchael - Thanks for your insight. I think I see where you're going with this. To make '==' comparisons for subsetting against an ordered factor, I've had to create a lookup table for all possible values I'd ever want to compare against (all dates covered by the quarters in question, in this

[R] Finicky factor comparison operators

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 ==

Re: [R] save output of loop

The short answer to your question is *don't* concatenate the values in the row, then attempt to /rbind()/ them incrementally to a data.frame. Instead build each column separately inside the loop, then /cbind() (data.frame()/ does an implicit/ cbind()/ ) them together at the end. Something like

[R] Selection by ordered factors

What I want to do is create a data.frame column from ranges of dates (e.g. annual quarters) as an ordered factor, then use this column to select by ranges of the factor (e.g. all quarters in 2009). The factors capture the date ranges, instead of having to write elaborate code to do range