Graph example not working

[my-little-repository]

I just tried the first example on the main page concerning graphs (spectral) and that does not seem to work. I am using julia v 0.6.1 together with PlotRecipes 0.3.0 and the pyplot backend (using python3).

 julia> @time using PlotRecipes
 104.516603 seconds (20.16 M allocations: 1.319 GiB, 0.86% gc time)
 
 julia> Plots.backend()
 Plots.GRBackend()
 
 julia> @time pyplot()
  17.392845 seconds (2.38 M allocations: 134.907 MiB, 0.51% gc time)
 Plots.PyPlotBackend()
 
 julia> n = 15
 A = Float64[(rand()<0.5 ? 0 : rand()) for i=1:n,j=1:n]
 for i=1:n
     A[i,1:i-1] = A[1:i-1,i]
 end
 node_weights = 1:n

 [...]
 
 julia> 
 graphplot(A,
     node_weights = 1:n,
     marker = (:heat, :rect),
     line = (3, 0.5, :blues),
     marker_z = 1:n,
     names = 1:n
 )
 
 julia> WARNING: Array(::Type{T}, m::Int) where T is deprecated, use Array{T}(m) instead.
 Stacktrace:
  [1] depwarn(::String, ::Symbol) at ./deprecated.jl:70
  [2] Array(::Type{Int64}, ::Int64) at ./deprecated.jl:57
  [3] get_source_destiny_weight(::Array{Float64,2}) at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:43
  [4] macro expansion at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:247 [inlined]
  [5] apply_recipe(::Dict{Symbol,Any}, ::PlotRecipes.GraphPlot) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:287
  [6] _process_userrecipes(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/pipeline.jl:81
  [7] _plot!(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/plot.jl:175
  [8] (::RecipesBase.#kw##plot)(::Array{Any,1}, ::RecipesBase.#plot, ::PlotRecipes.GraphPlot) at ./<missing>:0
  [9] #graphplot#29(::Array{Any,1}, ::Function, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:363
  [10] (::PlotRecipes.#kw##graphplot)(::Array{Any,1}, ::PlotRecipes.#graphplot, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at ./<missing>:0
  [11] eval(::Module, ::Any) at ./boot.jl:235
  [12] eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:66
  [13] macro expansion at ./REPL.jl:97 [inlined]
  [14] (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:73
 while loading no file, in expression starting on line 0
 WARNING: Array(::Type{T}, m::Int) where T is deprecated, use Array{T}(m) instead.
 Stacktrace:
  [1] depwarn(::String, ::Symbol) at ./deprecated.jl:70
  [2] Array(::Type{Int64}, ::Int64) at ./deprecated.jl:57
  [3] get_source_destiny_weight(::Array{Float64,2}) at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:44
  [4] macro expansion at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:247 [inlined]
  [5] apply_recipe(::Dict{Symbol,Any}, ::PlotRecipes.GraphPlot) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:287
  [6] _process_userrecipes(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/pipeline.jl:81
  [7] _plot!(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/plot.jl:175
  [8] (::RecipesBase.#kw##plot)(::Array{Any,1}, ::RecipesBase.#plot, ::PlotRecipes.GraphPlot) at ./<missing>:0
  [9] #graphplot#29(::Array{Any,1}, ::Function, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:363
  [10] (::PlotRecipes.#kw##graphplot)(::Array{Any,1}, ::PlotRecipes.#graphplot, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at ./<missing>:0
  [11] eval(::Module, ::Any) at ./boot.jl:235
  [12] eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:66
  [13] macro expansion at ./REPL.jl:97 [inlined]
  [14] (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:73
 while loading no file, in expression starting on line 0
 WARNING: Array(::Type{T}, m::Int) where T is deprecated, use Array{T}(m) instead.
 Stacktrace:
  [1] depwarn(::String, ::Symbol) at ./deprecated.jl:70
  [2] Array(::Type{Float64}, ::Int64) at ./deprecated.jl:57
  [3] get_source_destiny_weight(::Array{Float64,2}) at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:45
  [4] macro expansion at /home/yves/.julia/v0.6/PlotRecipes/src/graphs.jl:247 [inlined]
  [5] apply_recipe(::Dict{Symbol,Any}, ::PlotRecipes.GraphPlot) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:287
  [6] _process_userrecipes(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/pipeline.jl:81
  [7] _plot!(::Plots.Plot{Plots.PyPlotBackend}, ::Dict{Symbol,Any}, ::Tuple{PlotRecipes.GraphPlot}) at /home/yves/.julia/v0.6/Plots/src/plot.jl:175
  [8] (::RecipesBase.#kw##plot)(::Array{Any,1}, ::RecipesBase.#plot, ::PlotRecipes.GraphPlot) at ./<missing>:0
  [9] #graphplot#29(::Array{Any,1}, ::Function, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at /home/yves/.julia/v0.6/RecipesBase/src/RecipesBase.jl:363
  [10] (::PlotRecipes.#kw##graphplot)(::Array{Any,1}, ::PlotRecipes.#graphplot, ::Array{Float64,2}, ::Vararg{Array{Float64,2},N} where N) at ./<missing>:0
  [11] eval(::Module, ::Any) at ./boot.jl:235
  [12] eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./REPL.jl:66
  [13] macro expansion at ./REPL.jl:97 [inlined]
  [14] (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:73
 while loading no file, in expression starting on line 0
 Error showing value of type Plots.Plot{Plots.PyPlotBackend}:
 ERROR: PyError (ccall(@pysym(:PyObject_Call), PyPtr, (PyPtr, PyPtr, PyPtr), o, arg, kw)) <class 'ValueError'>
 ValueError('Invalid RGBA argument: 1.0',)
   File "/usr/lib/python3/dist-packages/matplotlib/__init__.py", line 1894, in inner
     return func(ax, *args, **kwargs)
   File "/usr/lib/python3/dist-packages/matplotlib/axes/_axes.py", line 4028, in scatter
     alpha=alpha
   File "/usr/lib/python3/dist-packages/matplotlib/collections.py", line 890, in __init__
     Collection.__init__(self, **kwargs)
   File "/usr/lib/python3/dist-packages/matplotlib/collections.py", line 139, in __init__
     self.set_facecolor(facecolors)
   File "/usr/lib/python3/dist-packages/matplotlib/collections.py", line 674, in set_facecolor
     self._set_facecolor(c)
   File "/usr/lib/python3/dist-packages/matplotlib/collections.py", line 659, in _set_facecolor
     self._facecolors = mcolors.to_rgba_array(c, self._alpha)
   File "/usr/lib/python3/dist-packages/matplotlib/colors.py", line 237, in to_rgba_array
     result[i] = to_rgba(cc, alpha)
   File "/usr/lib/python3/dist-packages/matplotlib/colors.py", line 143, in to_rgba
     rgba = _to_rgba_no_colorcycle(c, alpha)
   File "/usr/lib/python3/dist-packages/matplotlib/colors.py", line 194, in _to_rgba_no_colorcycle
     raise ValueError("Invalid RGBA argument: {!r}".format(orig_c))

EDIT: the second example (Arc and chord diagrams) works fine.

[JackDevine]

Replacing the call to graphplot with

graphplot(A,
           node_weights = 1:n,
           nodeshape = :rect,
           line = (3, 0.5, :blue),
           nodeweights = 1:n,
           names = 1:n
       )

Gets rid of the error for me. @my-little-repository does that fix work for you too?