Hi
r-help-boun...@r-project.org napsal dne 02.02.2011 11:14:18:
> Hi
>
> r-help-boun...@r-project.org napsal dne 31.01.2011 15:51:16:
>
> >
> >
>
> <snip>
>
>
> > >
> > >
> >
> > Hi
> >
> > thanks. I am not sure if I have understood 100% but at least I know
now
> that
> > there's a diference.
> >
> > About this:
> >
> > lapsales
> > Store Prod qtd
> > 5 Aveiro Lapiseira 3
> > 8 Coimbra Lapiseira 1
> > 9 Setubal Lapiseira 1
> > > lapsales[max(lapsales$qtd),"Store"]
> > [1] Setubal
> > Levels: Aveiro Coimbra Evora lx Setubal
> >
> > why Setubal and not Aveiro?
> >
> >
> > Can you explain me the result?
Sorry I did not look to your code and used the code I sent you as a
solution
What do you expect max(lapsales$qtg) give you as a result?
If you changed the number qtd to 4 instead of 3 you will get
> lapsales[max(lapsales$qtd),"Store"]
[1] <NA>
Levels: Aveiro Coimbra Evora lx Setubal
So R give you what you ask for. You asked for third line and you got it.
If you asked for which position is the maximum number
lapsales[which.max(lapsales$qtd),"Store"]
[1] Aveiro
Levels: Aveiro Coimbra Evora lx Setubal
You will get desired result.
Regards
Petr
>
> Probably qtd is not what you think it is. I get
>
> > dados<- data.frame(Store = c
>
("Setubal","lx","Aveiro","Coimbra","Aveiro","Evora","Aveiro","Coimbra","Setubal"),Prod=c
>
("BlocoDesenho","BlocoDesenho","Tinteiro","Régua","Lapiseira","Regua","Tinteiro","Lapiseira","Lapiseira"),qtd=c
> (2,1,2,1,3,1,1,1,1))
> > lapsales <- dados[dados$Prod=="Lapiseira", ]
> > lapsales[which.max(lapsales[ , "qtd" ]), "Store"]
> [1] Aveiro
> Levels: Aveiro Coimbra Evora lx Setubal
> >
>
> and
>
> > str(lapsales)
> 'data.frame': 3 obs. of 3 variables:
> $ Store: Factor w/ 5 levels "Aveiro","Coimbra",..: 1 2 5
> $ Prod : Factor w/ 5 levels "BlocoDesenho",..: 2 2 2
> $ qtd : num 3 1 1
>
> Maybe you get something different.
>
> Regards
> Petr
>
>
>
>
>
> >
> > thanks
> > AD
> > --
> > View this message in context:
> http://r.789695.n4.nabble.com/Help-in-getting-
> > info-from-a-DataFrame-tp3247740p3248883.html
> > Sent from the R help mailing list archive at Nabble.com.
> >
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