[R] dataframe subset using levels as criteria

[Ernesto Jardim]

Yes!

Thanks

EJ

On Wed, 2002-01-30 at 15:13, Ben Bolker wrote:
> 
>  Perhaps you mean
> frota[frota$matricula %in% levels(logbooks.eda$matricula),]
> 
> ?
> 
> On 30 Jan 2002, Ernesto Jardim wrote:
> 
> > Hi
> >
> > I want to select a subset of a dataframe (frota) using the levels of a
> > factor (matricula) in another dataframe (logbooks.eda).
> >
> > The command and output are bellow and it's not working ...
> >
> > > frota[frota$matricula==levels(logbooks.eda$matricula),]
> >   matricula compff   tab potmaq
> > 1  A-1420-C     NA    NA     NA
> > 2  A-1676-C     NA 12070  36800
> > 3  A-1954-C   3214 17565  44100
> > 4  A-1961-C   3197 17992  46300
> > 5  A-2011-C   3198 17184  46300
> > Warning messages:
> > 1: longer object length
> > 	is not a multiple of shorter object length in: is.na(e1) | is.na(e2)
> > 2: longer object length
> > 	is not a multiple of shorter object length in:
> > "==.default"(frota$matricula, levels(logbooks.eda$matricula))
> >
> > Can someone help me with this ?
> >
> > EJ
> >
> > ps: I'm using R-1.4.0-patched and SuSE 7.1
> >
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> -- 
> 318 Carr Hall                                bolker at zoo.ufl.edu
> Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
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