Create Tangent Line / Derivative Line Animation with Plots got Errors

Hi all,

Is it possible to create the animation of sliding tangent line with Plots?

I got error with my code:

using Plots 

f(x) =  -x^2 + 2x + 2
gradient_line(f, x₀) = (x -> f(x₀) + f'(x₀)*(x-x₀))
plot(f, -3:0.1:5, label = "f(x) = -x² + 2x + 2", xlabel = "x", ylabel = "f(x)");

@gif for i in 1:3
    plot(gradient_line(f, i), -3:0.1:0.5, label = "f'($i)", color = 2);
end

ERROR: LoadError: MethodError: no method matching adjoint(::typeof(f))
Closest candidates are:
** adjoint(::Union{LinearAlgebra.QR, LinearAlgebra.QRCompactWY, LinearAlgebra.QRPivoted}) at ~/julia-1.7.3/share/julia/stdlib/v1.7/LinearAlgebra/src/qr.jl:509**
** adjoint(::Union{LinearAlgebra.Cholesky, LinearAlgebra.CholeskyPivoted}) at ~/julia-1.7.3/share/julia/stdlib/v1.7/LinearAlgebra/src/cholesky.jl:538**
** adjoint(::LinearAlgebra.Hessenberg) at ~/julia-1.7.3/share/julia/stdlib/v1.7/LinearAlgebra/src/hessenberg.jl:423**
** …**
Stacktrace:
** [1] (::var"#17#18"{typeof(f), Int64})(x::Float64)**
** @ Main ~/LasthrimProjection/plot.jl:4**
** [2] iterate**
** @ ./generator.jl:47 [inlined]**
** [3] _collect**
** @ ./array.jl:744 [inlined]**
** [4] collect_similar(cont::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, itr::Base.Generator{StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, var"#17#18"{typeof(f), Int64}})**
** @ Base ./array.jl:653**
** [5] map(f::Function, A::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64})**
** @ Base ./abstractarray.jl:2867**
** [6] _compute_y**
** @ ~/.julia/packages/RecipesPipeline/OXGmH/src/series.jl:72 [inlined]**
** [7] _compute_xyz(x::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, y::Function, z::Nothing, nice_error::Bool)**
** @ RecipesPipeline ~/.julia/packages/RecipesPipeline/OXGmH/src/series.jl:86**
** [8] macro expansion**
** @ ~/.julia/packages/RecipesPipeline/OXGmH/src/series.jl:147 [inlined]**
** [9] apply_recipe(plotattributes::AbstractDict{Symbol, Any}, #unused#::Type{RecipesPipeline.SliceIt}, x::Any, y::Any, z::Any)**
** @ RecipesPipeline ~/.julia/packages/RecipesBase/qpxEX/src/RecipesBase.jl:289**
** [10] _process_userrecipes!(plt::Any, plotattributes::Any, args::Any)**
** @ RecipesPipeline ~/.julia/packages/RecipesPipeline/OXGmH/src/user_recipe.jl:36**
** [11] recipe_pipeline!(plt::Any, plotattributes::Any, args::Any)**
** @ RecipesPipeline ~/.julia/packages/RecipesPipeline/OXGmH/src/RecipesPipeline.jl:70**
** [12] _plot!(plt::Plots.Plot, plotattributes::Any, args::Any)**
** @ Plots ~/.julia/packages/Plots/lW9ll/src/plot.jl:209**
** [13] #plot#145**
** @ ~/.julia/packages/Plots/lW9ll/src/plot.jl:91 [inlined]**
** [14] macro expansion**
** @ ~/LasthrimProjection/plot.jl:8 [inlined]**
** [15] top-level scope**
** @ ~/.julia/packages/Plots/lW9ll/src/animation.jl:235**
** [16] include(fname::String)**
** @ Base.MainInclude ./client.jl:451**
** [17] top-level scope**
** @ REPL[1]:1**
in expression starting at /home/browni/LasthrimProjection/plot.jl:7

Capture d’écran_2022-09-26_20-43-42

Did you forgot:

using Zygote

?

1 Like

Yes, I do not know that I need Zygote…

I am trying to make the animation correctly now…