[R] dataframe subset using levels as criteria

[Ben Bolker]

 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
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