Help in getting info from a DataFrame
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