KeyError: key :letter not found

[jamesmaino]

Plots appears broken when units are used.

using Unitful, UnitfulRecipes, Plots
const a = 1u"m/s^2"
v(t) = a * t
x(t) = a/2 * t^2
t = (0:0.01:100)*u"s"
plot(x.(t), v.(t), xlabel="position", ylabel="speed")

KeyError: key :letter not found
Stacktrace:
 [1] getindex at .\dict.jl:477 [inlined]
 [2] macro expansion at C:\Users\james\.julia\packages\UnitfulRecipes\5RFXj\src\UnitfulRecipes.jl:12 [inlined]
 [3] apply_recipe(::Dict{Symbol,Any}, ::Type{Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1}}, ::Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1}) at C:\Users\james\.julia\packages\RecipesBase\G4s6f\src\RecipesBase.jl:279
 [4] _apply_type_recipe(::Dict{Symbol,Any}, ::Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1}, ::Symbol) at C:\Users\james\.julia\packages\Plots\cc8wh\src\series.jl:186
 [5] macro expansion at C:\Users\james\.julia\packages\Plots\cc8wh\src\series.jl:268 [inlined]
 [6] apply_recipe(::Dict{Symbol,Any}, ::Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1}, ::Array{Quantity{Float64,�*�^-1,Unitful.FreeUnits{(m, s^-1),�*�^-1,nothing}},1}) at C:\Users\james\.julia\packages\RecipesBase\G4s6f\src\RecipesBase.jl:279
 [7] _process_userrecipes(::Plots.Plot{Plots.GRBackend}, ::Dict{Symbol,Any}, ::Tuple{Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1},Array{Quantity{Float64,�*�^-1,Unitful.FreeUnits{(m, s^-1),�*�^-1,nothing}},1}}) at C:\Users\james\.julia\packages\Plots\cc8wh\src\pipeline.jl:85
 [8] _plot!(::Plots.Plot{Plots.GRBackend}, ::Dict{Symbol,Any}, ::Tuple{Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1},Array{Quantity{Float64,�*�^-1,Unitful.FreeUnits{(m, s^-1),�*�^-1,nothing}},1}}) at C:\Users\james\.julia\packages\Plots\cc8wh\src\plot.jl:178
 [9] plot(::Array{Quantity{Float64,�,Unitful.FreeUnits{(m,),�,nothing}},1}, ::Vararg{Any,N} where N; kw::Base.Iterators.Pairs{Symbol,String,Tuple{Symbol,Symbol},NamedTuple{(:xlabel, :ylabel),Tuple{String,String}}}) at C:\Users\james\.julia\packages\Plots\cc8wh\src\plot.jl:57

[briochemc]

What version of Plots.jl are you using? I think the :letter feature was added recently. Maybe updating Plots.jl will solve this? It works for me with these versions (up-to-date or close I think)

pkg> st
Status `~/.julia/environments/v1.5/Project.toml`
  [91a5bcdd] Plots v1.3.6
  [1986cc42] Unitful v1.2.1
  [42071c24] UnitfulRecipes v0.2.4

[jamesmaino]

Strange. Could it be a Julia v1.4 problem? Or are you using the Plots#master branch?

Here are my versions:

(@v1.4) pkg> st
Status `C:\Users\james\.julia\environments\v1.4\Project.toml`
  [91a5bcdd] Plots v0.29.9
  [1986cc42] Unitful v1.2.1
  [42071c24] UnitfulRecipes v0.2.4

[briochemc]

Could you try to update Plots with pkg> up? 🙂

[jamesmaino]

That was the first thing I tried. Sorry, I'm still a bit new to Julia. Any other suggestions?

[briochemc]

Mmm... But you showed me you were using Plots v0.29.9, and the current version is Plots v1.3.6. Could you try pkg> pin Plots@v1.3.6? This should show you the incompatible unsatisfiable requirement that prevented Plots' update.

[jamesmaino]

Indeed! I didn't realise other package will prevent updates like that. Thanks!

ERROR: Unsatisfiable requirements detected for package RecipesBase [3cdcf5f2]:
 RecipesBase [3cdcf5f2] log:
 ├─possible versions are: [0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 1.0.0-1.0.1] or uninstalled
 ├─restricted to versions [0.7-0.8, 1] by GeoData [9b6fcbb8], leaving only versions [0.7.0, 0.8.0, 1.0.0-1.0.1]
 │ └─GeoData [9b6fcbb8] log:
 │   ├─possible versions are: 0.1.0 or uninstalled
 │   └─GeoData [9b6fcbb8] is fixed to version 0.1.0
 ├─restricted by compatibility requirements with Plots [91a5bcdd] to versions: 1.0.0-1.0.1
 │ └─Plots [91a5bcdd] log:
 │   ├─possible versions are: [0.12.1-0.12.4, 0.13.0-0.13.1, 0.14.0-0.14.2, 0.15.0-0.15.1, 0.16.0, 0.17.0-0.17.4, 0.18.0, 0.19.0-0.19.3, 0.20.0-0.20.6, 0.21.0, 0.22.0-0.22.5, 0.23.0-0.23.2, 0.24.0, 0.25.0-0.25.3, 0.26.0-0.26.3, 0.27.0-0.27.1, 0.28.0-0.28.4, 0.29.0-0.29.9, 1.0.0-1.0.14, 1.1.0-1.1.4, 1.2.0-1.2.6, 1.3.0-1.3.6] or uninstalled
 │   ├─restricted to versions [0.28-0.29, 1] by GrowthMaps [a252ced4], leaving only versions [0.28.0-0.28.4, 0.29.0-0.29.9, 1.0.0-1.0.14, 1.1.0-1.1.4, 1.2.0-1.2.6, 1.3.0-1.3.6]
 │   │ └─GrowthMaps [a252ced4] log:
 │   │   ├─possible versions are: 0.1.0 or uninstalled
 │   │   └─GrowthMaps [a252ced4] is fixed to version 0.1.0
 │   └─restricted to versions 1.3.6 by an explicit requirement, leaving only versions 1.3.6
 └─restricted by compatibility requirements with LossFunctions [30fc2ffe] to versions: [0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0] — no versions left
   └─LossFunctions [30fc2ffe] log:
     ├─possible versions are: [0.3.0-0.3.1, 0.4.0, 0.5.0-0.5.1, 0.6.0-0.6.2] or uninstalled
     └─restricted to versions 0.5 by Dispersal [8797f018], leaving only versions 0.5.0-0.5.1
       └─Dispersal [8797f018] log:
         ├─possible versions are: 0.1.0 or uninstalled
         ├─restricted to versions 0.1 by Biosecurity [b5f6e96a], leaving only versions 0.1.0
         │ └─Biosecurity [b5f6e96a] log:
         │   ├─possible versions are: 0.1.0 or uninstalled
         │   └─Biosecurity [b5f6e96a] is fixed to version 0.1.0
         └─Dispersal [8797f018] is fixed to version 0.1.0

[jw3126]

See also #28