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2013 Apr 01
1
Factor to numeric conversion - as.numeric(levels(f))[f] - Language definition seems to say to not use this.
Note the edited subject line! I don't know why I typed it as it was before.
This says that as.numeric(as.character(f)) will work regardless of the
implementation, and I agree.
It's the recommendation to use as.numeric(levels(f))[f] that has me
wondering about section 2.3.1 of the language definition. I expect that
this idiom is in widespread use, and perhaps the language definition