I imported some objects as follows, in this example I put only two, but I want to work with many, so I need to automate the processes a little:

library(quantmod)

#escolhendo a data que deseja
start <- as.Date("2014-01-01")
end<- as.Date("2018-01-12")

#primeiro termo refere a quais ativos vc quer baixar
#segundo de onde vc quer
#terceiro a data inicial
#quarto a data final
getSymbols(ativos, src = "yahoo", from = start, to = end)

After importing the objects, I need to transform them to data.frame and change their headers to a for , but I can not call each object in each iteration.

Iwouldliketochangealltheheadersinafor,aswellastransformallindata.frametoafor,butIcannotcalleachobjectineachiteration.

Itriedtodothisbutitdidnotwork:

#cabeçalhodosativosimportadoscabecalho<-c("abertura","máxima", "mínima", "fechamento", "volume", "ajuste")

ativos2<-list(BVSP,PETR4.SA)


for(i in 1:NROW(ativos2)){

  colnames(ativos2[i])<-cabecalho

}

As suggested by the colleague in the re-comment this is as follows

for(i in 1:NROW(ativos2)){

 colnames(ativos2[[i]])<-cabecalho

}

And the following error appears

Error in colnames<- ( *tmp* , value = header):   attempt to set 'colnames' on an object with less than two dimensions