How to initialize empty data frame (lot of columns at the same time) in R

Question

I found how to initialize an empty data frame with 3 or 4 dimensions. It's like

df <- data.frame(Date=as.Date(character()),              File=character(),               User=numeric(),               stringsAsFactors=FALSE) 

However, What's the most effective way to initialize an empty data.frame with a lot of column names. like

mynames <- paste("hello", c(1:10000)) 

The wrong way I tried is:

df <- data.frame(mynames=numeric()) 

Thanks a lot beforehand

Answer 1

Maybe this -

df <- data.frame(matrix(ncol = 10000, nrow = 0)) colnames(df) <- paste0("hello", c(1:10000)) 

And @joran's suggestion - df <- setNames(data.frame(matrix(ncol = 10000, nrow = 0)),paste0("hello", c(1:10000)))