[R] Help in getting info from a DataFrame

[ADias]

Petr Pikal wrote:
> 
> Hi
> 
> r-help-bounces at r-project.org napsal dne 31.01.2011 09:44:00:
> 
>> 
>> 
>> 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 
>> >> ","Régua 
>> >> ","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$Prod=="Lapiseira",  ]
>> >  > lapsales[which.max(lapsales[ , "qtd" ]), "Store"]
>> > [1] Aveiro
>> > Levels: Aveiro Coimbra Evora lx Setubal
>> > 
>> > -- 
>> > David Winsemius, MD
>> > West Hartford, CT
>> > 
>> > ______________________________________________
>> > R-help at r-project.org mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> > http://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>> > 
>> > 
>> Hi,
>> 
>> thank you for the help.
>> 
>> Two questions I would like to make.
>> 
>> Suppose I have put your answer on an object like this:
>> 
>> r<-lapsales[which.max(lapsales[ , "qtd" ]), "Store"]
>> 
>> so 
>> >r
>> [1] Aveiro
>> Levels: Aveiro Coimbra Evora lx Setubal
>> 
>> and suppoese I wish to add this year result to previous years results:
>> 
>> results<-c("Lx","Setubal")
>> so I did:
>> 
>> results<-c(results,r)
>> 
>> and what I get is:
>> 
>> > results
>> [1] "Lx"      "Setubal" "1" 
>> 
>> why "1" and not "Aveiro"?
> 
> you has to distinct between factor and character objects. Factor is vector 
> of integers with labels and concatenation add this integer but not a 
> label. Transform factor to character vector.
> 
> results<-c(results,as.character(r))
> 
> Regards
> Petr
> 
> 
>> 
>> Second question is:
>> 
>> > lapsales
>>     Store      Prod qtd
>> 5  Aveiro Lapiseira   3
>> 8 Coimbra Lapiseira   1
>> 9 Setubal Lapiseira   1
>> > lapsales[max(lapsales$qtd),"Store"]
>> [1] Setubal
>> Levels: Aveiro Coimbra Evora lx Setubal
>> 
>> why Setubal and not Aveiro?
>> 
>> many thanks
>> AD
>> -- 
>> View this message in context: 
> http://r.789695.n4.nabble.com/Help-in-getting-
>> info-from-a-DataFrame-tp3247740p3248276.html
>> Sent from the R help mailing list archive at Nabble.com.
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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?

thanks
AD
-- 
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