You likely need to load ImplicitEquations, which defines \Equal[tab].
As for what to make greater, presumably your 0.1, but it is your exploration, so I’ll defer. But this choice creates a graphic:
using ModelingToolkit
using Plots
using ImplicitEquations
@variables x y;
f(x,y)= sqrt((x^2+144)+(y^2+144))
let ex = Differential(x)(f(x, y))
func_ex = build_function(expand_derivatives(ex), x, y)
@eval ∂xf(x, y) = ($func_ex)(x,y)
end
using Plots
using ImplicitEquations
plot(∂xf ⩵ 0.1, xlims=(-10, 100), ylims=(-100, 100))
plot!(f ⩵ 20, xlims=(-10, 100), ylims=(-100, 100))
I have a problem to add Plots Pkg. please help me!
julia> Pkg.add(“Plots”)
Updating registry at C:\Users\HP\.julia\registries\General
Updating registry at C:\Users\HP\.julia\registries\JuliaComputingRegistry
Resolving package versions…
No Changes to C:\Users\HP\.julia\environments\JuliaPro_v1.5.3-1\Project.toml
No Changes to C:\Users\HP\.julia\environments\JuliaPro_v1.5.3-1\Manifest.toml
when i write using Plots. i have this error
[ Info: Precompiling Plots [91a5bcdd-55d7-5caf-9e0b-520d859cae80]
Your GR installation is incomplete. Rerun build step for GR package.
ERROR: LoadError: LoadError: InitError: Evaluation into the closed module GR breaks incremental compilation because the side effects will not be permanent. This is likely due to some other module mutating GR with eval during precompilation - don’t do this.
Stacktrace:
[1] eval at .\boot.jl:331 [inlined]
[2] init() at C:\Users\HP.julia\packages\GR\RlE5Y\src\GR.jl:274
[3] _include_from_serialized(::String, ::Array{Any,1}) at .\loading.jl:697
[4] _require_search_from_serialized(::Base.PkgId, ::String) at .\loading.jl:782
[5] _require(::Base.PkgId) at .\loading.jl:1007
[6] require(::Base.PkgId) at .\loading.jl:928
[7] require(::Module, ::Symbol) at .\loading.jl:923
[8] include(::Function, ::Module, ::String) at .\Base.jl:380
[9] include at .\Base.jl:368 [inlined]
[10] include(::String) at C:\Users\HP.julia\packages\Plots\lmp2A\src\Plots.jl:1
[11] top-level scope at C:\Users\HP.julia\packages\Plots\lmp2A\src\Plots.jl:212
[12] include(::Function, ::Module, ::String) at .\Base.jl:380
[13] include(::Module, ::String) at .\Base.jl:368
[14] top-level scope at none:2
[15] eval at .\boot.jl:331 [inlined]
[16] eval(::Expr) at .\client.jl:467
[17] top-level scope at .\none:3
during initialization of module GR
in expression starting at C:\Users\HP.julia\packages\Plots\lmp2A\src\backends\gr.jl:6
in expression starting at C:\Users\HP.julia\packages\Plots\lmp2A\src\Plots.jl:212
I had the same issue and build GR command won’t fix it.
Here is how i did fix it:
goto ~.julia\compiled\v1.6\GR
delete everything in there
run the build command again