Out of the answer I got from How to create an animation based on t, x, y and z data? - #6 by fusion809 I’ve now got Julia code that works in generating a 3D animation of chaotic attractors, like the Rossler Attractor. The problem is the resolution. Presently the resolution of the generated GIF is fairly low, and I’d like a HD GIF (1920x1080). This is the code I have been trying:
# define the Rossler attractor
using Plots;
mutable struct Rossler
dt; a; b; c; x; y; z
end
function step!(l::Rossler)
dx = -l.y-l.z ; l.x += l.dt * dx
dy = l.x + l.a*l.y ; l.y += l.dt * dy
dz = l.b+l.z*(l.x-l.c) ; l.z += l.dt * dz
end
attractor = Rossler((dt = 0.1, a = 0.2, b = 0.2, c = 14, x = 1., y = 1., z = 1.)...)
# initialize a 3D plot with 1 empty series
plt = plot3d(1, xlim=(-25,25), ylim=(-25,25), zlim=(0,90),
title = "Rossler Attractor", marker = 2,
xlabel="x", ylabel="y", zlabel="z",
size="(1920, 1080)",
label="")
# build an animated gif by pushing new points to the plot, saving every 10th frame
@gif for i=1:20000
step!(attractor)
push!(plt, attractor.x, attractor.y, attractor.z)
end every 10
Before adding the size= field in plot3d this code ran fine, aside from producing a low-res GIF. Since adding it (and I assumed this would do what I want based on the plotting attributes page and the fact it mentions a size= argument of the format I used) I’m now getting the error:
MethodError: no method matching *(::Char, ::Measures.Length{:mm,Float64})
Closest candidates are:
*(::Any, ::Any, !Matched::Any, !Matched::Any...) at operators.jl:502
*(::Union{AbstractChar, AbstractString}, !Matched::Union{AbstractChar, AbstractString}...) at strings/basic.jl:229
*(!Matched::Number, ::Measures.Measure) at /home/fusion809/.julia/packages/Measures/eNttC/src/operations.jl:48
...
Stacktrace:
[1] prepare_output(::Plots.Plot{Plots.GRBackend}) at /home/fusion809/.julia/packages/Plots/oiirH/src/plot.jl:257
[2] show(::IOStream, ::MIME{Symbol("image/png")}, ::Plots.Plot{Plots.GRBackend}) at /home/fusion809/.julia/packages/Plots/oiirH/src/output.jl:197
[3] png(::Plots.Plot{Plots.GRBackend}, ::String) at /home/fusion809/.julia/packages/Plots/oiirH/src/output.jl:8
[4] frame(::Animation, ::Plots.Plot{Plots.GRBackend}) at /home/fusion809/.julia/packages/Plots/oiirH/src/animation.jl:20
[5] frame(::Animation) at /home/fusion809/.julia/packages/Plots/oiirH/src/animation.jl:18
[6] macro expansion at /home/fusion809/.julia/packages/Plots/oiirH/src/animation.jl:152 [inlined]
[7] macro expansion at ./In[6]:30 [inlined]
[8] macro expansion at /home/fusion809/.julia/packages/Plots/oiirH/src/animation.jl:163 [inlined]
[9] top-level scope at ./In[6]:26 [inlined]
[10] top-level scope at ./none:0
I haven’t the foggiest as to how I am meant to fix this error while still achieving what I want. Any ideas?
