Hi all,

I am using DataFrames to import couple of hundreds of DataFiles, that get 
merged into one single DataFrame. Currently I am wondering about what would 
be the best way to initialize that DataFrame, and hope you can help me.

If I do something like 

df_all = DataFrame()

for file in filelist
  df_tmp =  readtable(file)
  ... do stuff to the df_tmp...
  append!(df_all,df_tmp)
end

I obviously can't match the column numbers, and everything fails. I wold 
need to initialize the DataFrame using sth like

df_all = DataFrame(:col1 = Float64[], :col2 = Int64[])

but I have 26 columns, and from experiment to experiment they tend to 
change. Useful is setting up a Dictionary, that relates Columns to Eltypes, 
but there is currently no way of supplying that to the initialization 
process.

Is there something I missed? Or could easier initialization routines be 
implemented?

Thank you, Max

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