ODE.jl: PolyCompat not defined

Hi all,

I am trying to run ODE.jl in Julia 1.5, but I get the following error when loading the package. I have installed Polynomials using Pkg.add(). I know there are better solvers available in DifferentialEquations.jl, but I want to use ode45 to try to replicate some calculations that were done in Matlab.

julia> using Polynomials, ODE
[ Info: Precompiling ODE [c030b06c-0b6d-57c2-b091-7029874bd033]
ERROR: LoadError: UndefVarError: PolyCompat not defined
[1] include(::Function, ::Module, ::String) at .\Base.jl:380
[2] include(::Module, ::String) at .\Base.jl:368
[3] top-level scope at none:2
[4] eval at .\boot.jl:331 [inlined]
[5] eval(::Expr) at .\client.jl:467
[6] top-level scope at .\none:3
in expression starting at C:\Users\caioh.julia\packages\ODE\foTmY\src\ODE.jl:7
ERROR: Failed to precompile ODE [c030b06c-0b6d-57c2-b091-7029874bd033] to C:\Users\caioh.julia\compiled\v1.5\ODE\yzDex_OpTrA.ji.
[1] error(::String) at .\error.jl:33
[2] compilecache(::Base.PkgId, ::String) at .\loading.jl:1305
[3] _require(::Base.PkgId) at .\loading.jl:1030
[4] require(::Base.PkgId) at .\loading.jl:928
[5] require(::Module, ::Symbol) at .\loading.jl:923

You must have an older version of Polynomials. I think v0.6 and v0.7 (allowed in the Project.toml file of ODE.jl) don’t need to use PolyCompat.

1 Like

The ode45 there isn’t going to be all that similar. DP5 of OrdinaryDiffEq.jl is going to be closer (to the original dopri).

1 Like

Thanks! Indeed, DP5() was close enough.

My experience on this error message, for fellow future newbies who were confused like me – I had to remove the old versions of ODE and Polynomials from my package, then re-add them. I.e.:

activate .
rm Polynomials
rm ODE

(then I exited, re-started, came back)

activate .
add Polynomials
add ODE

To check versions before and after:

using Pkg