I am using DifferentialEquations.jl in a Julia Notebook. The code starts as: using DifferentalEquations using ParameterizedFunctions sir_ode = @ode_def SIRModel begin dS = -β*S*I dI = β*S*I-γ*I dR = γ*I end β γ When executed, I get the error: UndefVarError: @ode_def not defin…

That doesn’t seem possible. uhh, what versions?

You are correct, it does not seem possible. Here is a status list of precompiled binaries in Julia 1.4. Status `~/.julia/environments/v1.4/Project.toml` [c52e3926] Atom v0.12.11 [fbb218c0] BSON v0.2.6 [aae01518] BandedMatrices v0.15.7 [6e4b80f9] BenchmarkTools v0.5.0 [0487d830] Bifurcatio…

Hi, I get the same error which doesn’t disappear though. I tried Jupyter, Vscode, Pluto. It says UndefVarError. Any more help on this? I do not have problem with other functions though.

Did you do using ParameterizedFunctions?

Hi Chris, yes, exactly. I am watching your video on YouTube on DifferentialEquations.jl. First really thanks for the package, huge work, really really appreciate it. But in your video because I follow your notebook and I did not see using ParameterizedFunctions (maybe I did not notice it) I got the …

Note that ode_def was deprecated in 2020, and thus one needs to do using ParameterizedFunctions (and add that package) in order to use that functionality. This is already the reason why you will no longer find it in the DifferentialEquations.jl documentation. I added a comment to the video to hopefu…

Yeah, I see. actually there are some other changes (like there is no more A_mul_B! function and instead we have mul! which is part of LinearAlgebra, or A + B + C works exactly like A .+ B .+ C and … ) but as you said it is hard to update videos and these all can be searched. thanks Chris again for …

@ode_def not defined

New to Julia

ChrisRackauckas May 23, 2020, 9:54pm 4

Did your packages update mid-notebook? If you do that, you need a new Julia session to use the newer versions, so it could be something like that?

Topic		Replies	Views
Usage of @ode_def New to Julia	1	625	March 20, 2021
@ode_def macro leads to UndefRefError: access to undefined reference Optimization (Mathematical) error	7	1027	March 2, 2020
ParameterizedFunctions for setting up systems of ODEs General Usage	11	1180	November 28, 2020
Problem in solve() DifferentialEquations. None algorithm define Modelling & Simulations question , ode , differentialequation	11	416	April 25, 2024
@ in function declartion New to Julia	2	454	March 24, 2020

@ode_def not defined

Related topics