Hi, I try to optimize a simple quadratic function on a user-defined manifold (the hyperplan orthogonal to ones(n)) with the following code using Optim const c = ones(2) ./ sqrt(2) f(x) = 0.5 * sum((x - c).^2) g!(g,x) = g[:] = x - c struct HypOne <: Manifold end retract!(S::HypOne, x) = (x ./= sum…

The error reports that it does not “find” your defined methods, not that they are not good. The reason is, that you define them in your main scope, which in short is a different namespace than the one from Optim. One could in short say that is for safety reasons. To actually add methods to Optim.re…

Optim.jl : user defined Manifold, error in the definition of the retraction

Specific Domains Optimization (Mathematical)

aitzkora June 29, 2025, 8:49pm 3

Thanks, it solved my problem.

1 Like

Topic		Replies	Views
How to best model different domains in Optimization, especially Manifolds? Optimization (Mathematical)	40	929	June 21, 2023
[ANN] Manopt.jl Package Announcements optimization , math , manifolds	54	7554	November 5, 2025
[ANN] OptimKit.jl – A blissfully ignorant Julia package for gradient optimization Package Announcements	8	1802	June 21, 2020
[ANN] ManifoldsBase.jl 1.0 Package Announcements	17	653	October 31, 2025
[ANN] ManoptExamples.jl – Optimization Tasks on Manifolds Package Announcements optimization , math , manifolds	0	357	February 22, 2023

Optim.jl : user defined Manifold, error in the definition of the retraction

Related topics