No binding for `angle` and Plots does not accept`sympy.arg`

[melonedo]

julia> angle(Sym(1))
ERROR: MethodError: no method matching angle(::Sym)
Closest candidates are:
  angle(::Real) at number.jl:188
  angle(::Complex) at complex.jl:585
Stacktrace:
 [1] top-level scope
   @ REPL[4]:1

So angle is not supported, I should try sympy.arg

julia> sympy.arg(Sym(im))
π
─
2
julia> plot(sympy.arg(Sym("t")))
ERROR: #91 is not a Function, or is not defined at any of the values [-5.0, -1.0, 0.0, 0.01]
Stacktrace:
  [1] error(s::String)
    @ Base .\error.jl:33
  [2] tryrange(F::SymPy.var"#91#92"{SymPy.var"###257"}, vec::Vector{Float64})
    @ PlotUtils C:\Users\melonedo\.julia\packages\PlotUtils\es5pb\src\adapted_grid.jl:180
  [3] macro expansion
    @ C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\user_recipe.jl:252 [inlined]
  [4] apply_recipe(plotattributes::AbstractDict{Symbol, Any}, f::SymPy.var"#91#92"{SymPy.var"###257"})
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesBase\92zOw\src\RecipesBase.jl:282
  [5] _process_userrecipes!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\user_recipe.jl:36
  [6] recipe_pipeline!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\RecipesPipeline.jl:70
  [7] _plot!(plt::Plots.Plot, plotattributes::Any, args::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:172
  [8] plot(args::Any; kw::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:58
  [9] plot(args::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:52
 [10] top-level scope
    @ REPL[14]:1

caused by: BoundsError: attempt to access 0-element Vector{Plots.Subplot} at index [1]
Stacktrace:
  [1] getindex
    @ .\array.jl:801 [inlined]
  [2] getindex
    @ C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\types.jl:88 [inlined]
  [3] get_axis_limits(plt::Plots.Plot{Plots.GRBackend}, letter::Symbol)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\pipeline.jl:144
  [4] macro expansion
    @ C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\user_recipe.jl:249 [inlined]
  [5] apply_recipe(plotattributes::AbstractDict{Symbol, Any}, f::SymPy.var"#91#92"{SymPy.var"###257"})
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesBase\92zOw\src\RecipesBase.jl:282
  [6] _process_userrecipes!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\user_recipe.jl:36
  [7] recipe_pipeline!(plt::Any, plotattributes::Any, args::Any)
    @ RecipesPipeline C:\Users\melonedo\.julia\packages\RecipesPipeline\CirY4\src\RecipesPipeline.jl:70
  [8] _plot!(plt::Plots.Plot, plotattributes::Any, args::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:172
  [9] plot(args::Any; kw::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:58
 [10] plot(args::Any)
    @ Plots C:\Users\melonedo\.julia\packages\Plots\kyYZF\src\plot.jl:52
 [11] top-level scope
    @ REPL[14]:1

Then it seems it is impossible to make a phase angle plot on sympy objects.

[jverzani]

Thanks for the report!