import DataFrames.DataFrame

"""
Sets the data source using a DataFrame
`data_values(df::DataFrame)`

Adds all the columns of `df` to the data field.
"""
function data_values(df::DataFrame)
  vs = Any[]
  for n in names(df)
      push!(vs, (n, collect(df[n])) )
  end
  data_values(;vs...)
end
