Problems with Animation

New to Julia
, , , ,
1

Dear all,
I want to do a simple animation:

using Plots
plotly()
x=-1:0.01:1
y=-1:0.01:1
h(x,y)=x^2-y^2;
anim = Animation()
for θ in range(0,2π,length=10)
    surface(x,y,h,leg=false,camera=(θ,30))
    frame(anim)
end 
gif(anim,"teste.gif",fps=12)

However, an error message apperars:

MethodError: no method matching _show(::IOStream, ::MIME{Symbol("image/png")}, ::Plots.Plot{Plots.PlotlyBackend})
Closest candidates are:
  _show(::IO, !Matched::MIME{Symbol("text/html")}, ::Plots.Plot{Plots.PlotlyBackend}) at C:\Users\Usuário\.julia\packages\Plots\6EMd6\src\backends\plotly.jl:964
  _show(::IO, !Matched::MIME{Symbol("text/html")}, ::Plots.Plot) at C:\Users\Usuário\.julia\packages\Plots\6EMd6\src\output.jl:165
  _show(::IO, !Matched::MIME{Symbol("application/vnd.plotly.v1+json")}, ::Plots.Plot{Plots.PlotlyBackend}) at C:\Users\Usuário\.julia\packages\Plots\6EMd6\src\backends\plotly.jl:959
  ...
show(::IOStream, ::MIME{Symbol("image/png")}, ::Plots.Plot{Plots.PlotlyBackend}) at output.jl:215
png(::Plots.Plot{Plots.PlotlyBackend}, ::String) at output.jl:7
frame(::Animation, ::Plots.Plot{Plots.PlotlyBackend}) at animation.jl:20
frame(::Animation) at animation.jl:18
top-level scope at Campos_vetoriais.jl:16
include_string(::Function, ::Module, ::String, ::String, ::Int64) at utils.jl:286
(::Atom.var"#202#207"{String,Int64,String,Bool})() at eval.jl:121
withpath(::Atom.var"#202#207"{String,Int64,String,Bool}, ::String) at utils.jl:30
withpath(::Function, ::String) at eval.jl:9
(::Atom.var"#201#206"{String,Int64,String,Bool})() at eval.jl:119
with_logger at logging.jl:514 [inlined]
#200 at eval.jl:118 [inlined]
hideprompt(::Atom.var"#200#205"{String,Int64,String,Bool}) at repl.jl:127
macro expansion at eval.jl:117 [inlined]
macro expansion at dynamic.jl:24 [inlined]
eval(::String, ::Int64, ::String, ::String, ::Bool) at eval.jl:114
invokelatest(::Any, ::Any, ::Vararg{Any,N} where N; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at essentials.jl:710
invokelatest(::Any, ::Any, ::Vararg{Any,N} where N) at essentials.jl:709
macro expansion at eval.jl:41 [inlined]
(::Atom.var"#184#185")() at task.jl:356

Anyone can help me please?
I am with the following packages, on Julia 1.5.3:

  [c52e3926] Atom v0.12.25 ⚲
  [336ed68f] CSV v0.8.3
  [a2e0e22d] CalculusWithJulia v0.0.1
  [5ae59095] Colors v0.12.6
  [d38c429a] Contour v0.5.7
  [a93c6f00] DataFrames v0.22.5
  [0c46a032] DifferentialEquations v6.16.0
  [5789e2e9] FileIO v1.4.5
  [5752ebe1] GMT v0.29.0
  [28b8d3ca] GR v0.54.0 
  [4b11ee91] Gaston v1.0.4
  [2e9cd046] Gurobi v0.9.9
  [7073ff75] IJulia v1.23.1
  [95701278] ImplicitEquations v0.6.0
  [c601a237] Interact v0.10.3
  [b6b21f68] Ipopt v0.6.5
  [033835bb] JLD2 v0.3.3 
  [4076af6c] JuMP v0.21.5
  [2ddba703] Juniper v0.6.5
  [e5e0dc1b] Juno v0.8.4 ⚲ 
  [23fbe1c1] Latexify v0.14.7
  [2fda8390] LsqFit v0.12.0
  [4722fa14] PkgAuthentication v1.1.0
  [91a5bcdd] Plots v1.10.4
  [d330b81b] PyPlot v2.9.0
  [276daf66] SpecialFunctions v0.10.3
  [123dc426] SymEngine v0.8.3
  [44d3d7a6] Weave v0.10.6   
  [37e2e46d] LinearAlgebra   
  [de0858da] Printf
  [9a3f8284] Random
  [10745b16] Statistics
2

I don’t have PyPlot so can’t check, but to narrow down the problem I would recommend:

  1. Running the code from the REPL if you are currently running it from Atom/Juno, IJulia, or some other environment;
  2. Running the code with the default GR backend (i.e. comment out plotly()) to see whether it’s backend specific
  3. Running the code in a new environment with only Plots installed (you seem to have a lot of packages in your environment which is generally discouraged, unless you really all need them at the same time you should split your work up into project-specific environments with only those packages installed that you actually need)
3

You have to install the PlotlyBase package. When you ran plotly() it would have shown the following:

[ Info: For saving to png with the Plotly backend PlotlyBase has to be installed.

And without this package the gif file can’t be created.

Your code block does work with the default gr backend and if PlotlyBase is installed it will also work with plotly backend.