Using JuliaDB/IndexedTables with Gadfly

[cmcaine]

So I'm just trying to get Gadfly to plot an IndexedTable I've produced with the JuliaDB.table function.

The IterableTables documentation claims to support JuliaDB tables as data sources and Gadfly as a sink, but I'm doing it wrong and/or it doesn't work for me

Complete example:

julia> using IterableTables, JuliaDB, Gadfly

julia> t = table(1:10, (1:10) * 3, names = (:x, :y))
Table with 10 rows, 2 columns:
x   y
──────
1   3
2   6
3   9
4   12
5   15
6   18
7   21
8   24
9   27
10  30

julia> typeof(t)
IndexedTable{StructArrays.StructArray{NamedTuple{(:x, :y),Tuple{Int64,Int64}},1,NamedTuple{(:x, :y),Tuple{Array{Int64,1},Array{Int64,1}}}}}

julia> plot(t, x=:x, y=:y, Geom.point)
ERROR: MethodError: no method matching evalmapping(::IndexedTable{StructArrays.StructArray{NamedTuple{(:x, :y),Tuple{Int64,Int64}},1,NamedTuple{(:x, :y),Tuple{Array{Int64,1},Array{Int64,1}}}}}, ::Symbol)

```Closest candidates are:
  evalmapping(::Any, ::AbstractArray) at /home/colin/.julia/packages/Gadfly/09PWZ/src/mapping.jl:185
  evalmapping(::Any, ::Function) at /home/colin/.julia/packages/Gadfly/09PWZ/src/mapping.jl:186
  evalmapping(::Any, ::Distributions.Distribution) at /home/colin/.julia/packages/Gadfly/09PWZ/src/mapping.jl:187
  ...
Stacktrace:
 [1] evalmapping!(::Dict{Symbol,Any}, ::IndexedTable{StructArrays.StructArray{NamedTuple{(:x, :y),Tuple{Int64,Int64}},1,NamedTuple{(:x, :y),Tuple{Array{Int64,1},Array{Int64,1}}}}}, ::Gadfly.Data) at /home/colin/.julia/packages/Gadfly/09PWZ/src/mapping.jl:220
 [2] #plot#65(::Base.Iterators.Pairs{Symbol,Symbol,Tuple{Symbol,Symbol},NamedTuple{(:x, :y),Tuple{Symbol,Symbol}}}, ::Function, ::IndexedTable{StructArrays.StructArray{NamedTuple{(:x, :y),Tuple{Int64,Int64}},1,NamedTuple{(:x, :y),Tuple{Array{Int64,1},Array{Int64,1}}}}}, ::Type{Gadfly.Geom.PointGeometry}) at /home/colin/.julia/packages/Gadfly/09PWZ/src/Gadfly.jl:327
 [3] (::getfield(Gadfly, Symbol("#kw##plot")))(::NamedTuple{(:x, :y),Tuple{Symbol,Symbol}}, ::typeof(plot), ::IndexedTable{StructArrays.StructArray{NamedTuple{(:x, :y),Tuple{Int64,Int64}},1,NamedTuple{(:x, :y),Tuple{Array{Int64,1},Array{Int64,1}}}}}, ::Type{Gadfly.Geom.PointGeometry}) at ./none:0
 [4] top-level scope at none:0

[cmcaine]

This does work for VegaLite, though, which is nice.

using VegaLite
t |> @vlplot(
    :point,
    x = :x,
    y = :y)

[davidanthoff]

Support for Gadfly.jl hasn't survived the transition to julia 1.0, I'm afraid...

I had a brief look how difficult it would be to reenable it, and the old strategy won't work anymore... I'll think a little how we could sort this out.

I think in the meantime, what should work is to convert the JuliaDB table to a DataFrame and then pass that to Gadfly. Not exactly elegant, but might do the trick.

[davidanthoff]

GiovineItalia/Gadfly.jl#1292

[cmcaine]

I think in the meantime, what should work is to convert the JuliaDB table to a DataFrame and then pass that to Gadfly. Not exactly elegant, but might do the trick.

Yes, this is what I ended up doing:

import IndexedTables
import Gadfly

Gadfly.plot(data_source::IndexedTables.IndexedTable, 
	    elements::Union{Array{Gadfly.Layer,1}, Function, Gadfly.Element, Gadfly.Theme, Type}...;
	    mapping...) =
  Gadfly.plot(data_source |> DataFrame, elements...; mapping...)