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$qtd),"Store"]
> [1] Setubal
> Levels: Aveiro Coimbra Evora lx Setubal
>
> why Setubal and not Aveiro?
>
>
> Can you explain me the result?
Probably qtd is not what you think it is. I get
> dados<- data.frame(Store = c
("Setubal","lx","Aveiro","Coimbra","Aveiro","Evora","Aveiro","Coimbra","Setubal"),Prod=c("BlocoDesenho","BlocoDesenho","Tinteiro","Régua","Lapiseira","Regua","Tinteiro","Lapiseira","Lapiseira"),qtd=c(2,1,2,1,3,1,1,1,1))
> lapsales <- dados[dados$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
> --
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> info-from-a-DataFrame-tp3247740p3248883.html
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