R define dimensions of empty data frame

Question

I am trying to collect some data from multiple subsets of a data set and need to create a data frame to collect the results. My problem is don\'t know how to create an empt

Answer 1

If only the column names are available like :

cnms <- c("Nam1","Nam2","Nam3")

To create an empty data frame with the above variable names, first create a data.frame object:

emptydf <- data.frame()

Now call zeroth element of every column, thus creating an empty data frame with the given variable names:

for( i in 1:length(cnms)){
     emptydf[0,eval(cnms[i])]
 }