Indexing in dataframes

Specific Domains Data
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4

A DataFrame probably isn’t the right object for Master. Better to use a Dict instead

julia> d = Dict([Master.ID[i] => Master.PRICE[i] for i in 1:nrow(Master)]);

julia> function add_all(row_strs, d)
           sum(get.(Ref(d), row_strs, 0))
       end;

julia> map(eachrow(Relationship)) do r
           add_all(collect(r[2:end]), d)
       end
3-element Array{Int64,1}:
 216
 220
  78