How to append a whole dataframe to a CSV in R

Question

I can already append a row to a CSV using cat which makes that very easy:

  cat(\"my row, 1, 2, 3, 4\", \"mydf.csv\",sep=\"\\n\", append=TRU         


        

Answer 1

If you have enough memory, the most efficient way is to bind them all together then write to file:

df <- cbind(df1, df2, df3)
write.csv(df, "spam.csv")

Otherwise, you can use the append argument in write.csv:

dfs <- c(df1, df2, df3)
for (df in dfs){
  write.csv(df, "eggs.csv", append = TRUE)
}