ExtraFEMFeatures/Heat Equation

[francispoulin]

I am very new to Julia and going through some of the neat tutorials people have put together.

I installed Julia 0.6.0 on Ubunbu by downloading the generic version, as requested.

When I run the Heat Equation example the first line seems to go okay but the second has a MethodError, suggesting a method might be too new.

To be able to use this example should I use the most recent (bleeding edge) version? I am happy to do that but wanted to check to see if this is what is necessary.

MethodError: no method matching setcharheight(::Float64)
The applicable method may be too new: running in world age 24141, while current world is 24142.
Closest candidates are:
setcharheight(::Real) at /home/fpoulin/.julia/v0.6/GR/src/GR.jl:1010 (method too new to be called from this world context.)

Stacktrace:
 [1] #gr_set_font#316(::Symbol, ::Symbol, ::ColorTypes.RGB{FixedPointNumbers.Normed{UInt8,8}}, ::Int64, ::Function, ::Plots.Font) at /home/fpoulin/.julia/v0.6/Plots/src/backends/gr.jl:374
 [2] (::Plots.#kw##gr_set_font)(::Array{Any,1}, ::Plots.#gr_set_font, ::Plots.Font) at ./<missing>:0
 [3] gr_set_xticks_font(::Plots.Subplot{Plots.GRBackend}) at /home/fpoulin/.julia/v0.6/Plots/src/backends/gr.jl:561
 [4] _update_min_padding!(::Plots.Subplot{Plots.GRBackend}) at /home/fpoulin/.julia/v0.6/Plots/src/backends/gr.jl:612
 [5] _collect(::Array{RecipesBase.AbstractLayout,2}, ::Base.Generator{Array{RecipesBase.AbstractLayout,2},Plots.#_update_min_padding!}, ::Base.EltypeUnknown, ::Base.HasShape) at ./array.jl:454
 [6] _update_min_padding!(::Plots.GridLayout) at /home/fpoulin/.julia/v0.6/Plots/src/layouts.jl:310
 [7] prepare_output(::Plots.Plot{Plots.GRBackend}) at /home/fpoulin/.julia/v0.6/Plots/src/plot.jl:258
 [8] show(::IOStream, ::MIME{Symbol("image/png")}, ::Plots.Plot{Plots.GRBackend}) at /home/fpoulin/.julia/v0.6/Plots/src/output.jl:207
 [9] png(::Plots.Plot{Plots.GRBackend}, ::String) at /home/fpoulin/.julia/v0.6/Plots/src/output.jl:8
 [10] frame(::Plots.Animation, ::Plots.Plot{Plots.GRBackend}) at /home/fpoulin/.julia/v0.6/Plots/src/animation.jl:20
 [11] #animate#252(::Array{Any,1}, ::Function, ::Plots.FrameIterator, ::String) at /home/fpoulin/.julia/v0.6/Plots/src/animation.jl:43
 [12] (::RecipesBase.#kw##animate)(::Array{Any,1}, ::RecipesBase.#animate, ::Plots.FrameIterator, ::String) at ./<missing>:0 (repeats 2 times)
 [13] include_string(::String, ::String) at ./loading.jl:515

[ChrisRackauckas]

This is pointing to the animation in the plotting. Looks like an error with the Plots.jl. Could you point to the code you used?

Bringing in @mkborregaard in case this was unknown.

[francispoulin]

Sorry that I didn't include this before. The link is below.

I should probably add that when I tried Pkg.add("Plots"), it didn't work off the bad. I needed to add a few things, a couple of which were in latex. Maybe there is something else that I missed?

https://github.com/JuliaDiffEq/DiffEqTutorials.jl/blob/master/ExtraFEMFeatures/Heat%20Equation%20System%20Differing%20Diffusion%20Constants.ipynb

[mkborregaard]

Yes, it's the last unresolved "world age" issue (a group of issues arising from a change in how Julia updates functions used within other functions in julia 0.6). It happens in Juno and when running code by including a script. The solution is normally to simply call plot again. This is the first I've seen of it in Jupyter.

[mkborregaard]

It's not that you've missed something in Plots.

[ChrisRackauckas]

So hidden dup of JuliaPlots/Plots.jl#1047 ?

[mkborregaard]

That's the one yes.

[ChrisRackauckas]

Alright, closed as a dup of JuliaPlots/Plots.jl#1047. We can follow it there.

[francispoulin]

Thank you for the suggestion. I can confirm that when I try and execute the line a second time it works beautifully, and produces some pretty great looking animations.