Message-ID: <3EB8F170.4720.5D6D02@localhost>
Date: 2003-05-07T09:43:44Z
From: PIKAL Petr
Subject: Sum by categorical variable
In-Reply-To: <6C9A2D9477234140A56E9D1B073B28E901DB5D@gitmanex01.git.generali.ch>
Hi
On 6 May 2003 at 16:53, De Amicis Fabrizio (G.I.T.) wrote:
>
> Another easy(/stupid) question:
>
> with the following command
> j2<-xf1[1:10,"V4"]
> I have
>
> > j2
> [1] CHROMOLI LINEAGERMAI RINALDI
> GIUNTIMA
> AUTOSTELLA
> [6] CAIZZONE CENTRO B PEL E C SNC CONSORZI
> MAN NORD
> PDM
> 1304 Levels: MACHIAVELLI Snc MENARINI MANUFACTURERS LOGISTICS
> SERVICES ... ZUCCHERIFICIO DEL MOLISE
>
>
> Why j2 has 1304 Levels (I know that xf has 1304 rows)? How can I
> obtain a vector of 10 elements?
You actually have got first 10 elements of variable "V4" in j2
see length(j2),
but as it is a factor the level attribute has retained an information
about all different levels of "V4" which I presume is 1304. To get
rid of these levels just use
factor(j2)
>
> Thank you
>
>
> >
> >
> > ---------------------------------------------------------------
> > Fabrizio De Amicis
> >
> > IT Department
> > Generali Information Technologies - (GIT)
> >
> > Centro Galleria 2,
> > Via Cantonale
> > CH - 6928 Manno - Switzerland
> > Tel +41 91 806 6220
> > Fax +41 91 806 6298
> > E-mail: fabrizio.deamicis at git.generali.ch
> >
> >
> >
> >
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>
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CheersPetr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz