[R] Help in getting info from a DataFrame

ADias
Mon, 31 Jan 2011 08:44:00 -0000

David Winsemius wrote:
>
>
> On Jan 30, 2011, at 5:27 PM, ADias wrote:
>
>> dados<-
>> data
>> .frame
>> (Store
>> =
>> c
>> ("Setubal
>> ","lx
>> ","Aveiro
>> ","Coimbra
>>
","Aveiro","Evora","Aveiro","Coimbra","Setubal"),Prod=c("Bloco
>> Desenho","Bloco
>> Desenho
>> ","Tinteiro
>> ","R?gua
>> ","Lapiseira
>> ","Regua
>>
","Tinteiro","Lapiseira","Lapiseira"),qtd=c(2,1,2,1,3,1,1,1,1))
>
>
> See if this is a more useful approach:
>
>  > lapsales <- dados[dados$Prod=="Lapiseira",  ]
>  > lapsales[which.max(lapsales[ , "qtd" ]), "Store"]
> [1] Aveiro
> Levels: Aveiro Coimbra Evora lx Setubal
>
> --
> David Winsemius, MD
> West Hartford, CT
>
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>
Hi,

thank you for the help.

Two questions I would like to make.

Suppose I have put your answer on an object like this:

r<-lapsales[which.max(lapsales[ , "qtd" ]), "Store"]

so
>r
[1] Aveiro
Levels: Aveiro Coimbra Evora lx Setubal

and suppoese I wish to add this year result to previous years results:

results<-c("Lx","Setubal")
so I did:

results<-c(results,r)

and what I get is:

> results
[1] "Lx"      "Setubal" "1"

why "1" and not "Aveiro"?

Second question is:

> 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?

many thanks
AD
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