how to split one row into multiple rows in R

问题:

for the sake of simplicity suppose I have a column in a data frame like the one below , each row contains multiple countries separated by ,

df <- data.frame(                   countries = c(                                 "UK , Spain , Germany , Italy , Netherlands" ,                                  "UK , Canada , AUS , China" ,                                  "Spain , AUS , Italy , Russia"                                 )                 ) 

This is how data looks like

                   countries 1 UK , Spain , Germany , Italy , Netherland 2                 UK , Canada , AUS , China 3              Spain , AUS , Italy , Russia 

how can we transform this to be something like

  countries 1   UK 2   Spain 3   Germany 4   Italy 5   Netherlands 6   UK 7   Canada 8   AUS 9   China 10  Spain 11  AUS 12  Italy 13  Russia 

回答1:

Just try:

data.frame(countries=unlist(strsplit(as.character(df$countries)," , "))) 

文章来源: how to split one row into multiple rows in R