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# FAQ ## How can I save a solution every n steps, or at specific parameter values? You can use the callback `finaliseSolution` in the function call `continuation`. For example, you can use something like this to save all steps ```julia mySave(u, tau, step, contResult, personaldata) push!(personaldata, u) end ``` and pass it like `continuation(F,J,u,p0, finaliseSolution = (z, tau, step, contResult) -> mySave(z, tau, step, contResult, myData))` ## The Fold / Hopf Continuation does not work, why? This requires some precise computations. Have you tried passing the expression of the Jacobian instead of relying on finite differences. ## What is the parameter `theta` about in `ContinuationPar`? See the description of `continuation` on the page Library.