_equilibriummeasure(V) hanging without error

[OliverLunt]

If I run equilibriummeasure(x -> x^2) then the function hangs seemingly indefinitely without returning an output. From playing around with this package a few years ago, I would expect it to return within a few seconds.

After investigating, there appears to be an issue on line 24 of EquilibriumMeasures.jl in the _equilibriummeasure function:

H = T̃ \ (inv.(x .- x') * wŨ) # Hilbert wU\-> T̃

It is the backslash operation that seems to hang. I don't think it is an issue with automatic differentiation, since this line hangs even if I call the function directly (rather than via jacobian as in line 87).

Any idea what's causing the issue? I have found this package very helpful before; thanks for putting it together!

[dlfivefifty]

Thanks for point this out! This package is not actively maintained but I'll have a look.

[dlfivefifty]

This will take a while: as long as I'm updating everything I'm going to turn FastTransformsForwardDiff.jl into extensions, see

JuliaMath/AbstractFFTs.jl#138

[dlfivefifty]

It's fixed if you are on these branches:

JuliaMath/AbstractFFTs.jl#138
JuliaMath/FFTW.jl#311
JuliaArrays/InfiniteArrays.jl#212

Will take a while for these to be merged and tagged

[OliverLunt]

Thanks for that Sheehan, I'll check it out.

[dlfivefifty]

I'm pretty busy right now and I think it will take a bit of back-and-forth with the maintainers of FFTW.jl/AbstractFFTs.jl to get the PRs over the line.

@OliverLunt anyway I can convince you to help with those PRs?

[OliverLunt]

Apologies, I'm currently quite busy finishing a few papers – I might have some time to look at this once those have gone through.