[R] Odp: better way to trick data frame structure?

Petr PIKAL petr.pikal at precheza.cz
Wed May 5 08:02:27 CEST 2010


r-help-bounces at r-project.org napsal dne 05.05.2010 07:49:25:

> Hi,
> I have a data frame where 1 variable is a factor with only 1 level.  I 
> the data frame structure to reflect that there are 2 levels for this 
> even though this is not the case.  I am currently adding extra 'fake' 
> to the data frame to ensure that 2 levels are present, but this is 
> processing time in a loop quite a bit. Can I manually specify that this
> factor variable has two levels (even though this is lying to R)? 

Not at all lying. That is why hated factors are useful. Lust add all 
desired levels.

> ff<-factor("M")
> ff
[1] M
Levels: M
> levels(ff)<-c("M","F")
> ff
[1] M
Levels: M F


> Thanks,Seth
> -- 
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> trick-data-frame-structure-tp2130470p2130470.html
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