r - Performance of a loop for modifiying a factor -


so have following loop:

for(i in 1:dim(d)[1]) {   if(d$countryname[i] %in% c("italy","spain","canada","brazil","united states","france","mexico","colombia","peru","chile","argentina","ecuador"))    {next}    else    {d$countryname[i] <- "others"} }

the "d" dataframe has more 6,5 million rows , d$countryname factor.

is there way make faster? very slow. thank you.

how about:

log <- d$countryname %in% c("italy","spain","canada","brazil","united states","france","mexico","colombia","peru","chile","argentina","ecuador")  d$countryname[!log] <- "others"

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