Re: [deal.II] LineMinimization and p-Laplace

Hi Julie, I’m glad to hear that you managed to figure out what the problem was! Thank you for letting us know that you made progress, and that the line search part was in fact working as expected. Good luck with solving the next part of the puzzle :-) Best, Jean-Paul > On 5. May 2021, at 18:0

Re: [deal.II] LineMinimization and p-Laplace

Hi all, just wanna give you an update. LineMinimization was doing what it is supposed to do. The problem was p-Laplace and the configuration of a few parameters in the code. I am facing another problem but now it is of theoretical nature. Thanks a lot for the reply, Jean and Bruno :) On Wedne

Re: [deal.II] LineMinimization and p-Laplace

Hi Jean, f and g are build correctly according to the manual but I don't understand why it still stagnates in the third iteration (please see the attached log). And auto perform_linesearch = [&]() { const auto res_0 = ls_min_function(0.0);

Re: [deal.II] LineMinimization and p-Laplace

Hi Jean, I was thinking the same. I have followed the example in the namespace reference of LineMinimization and adjusted it to my problem. I'm currently reviewing the part where f and

Re: [deal.II] LineMinimization and p-Laplace

Hi Julie, So I was correct that in that the bracket evaluations converge towards one another, until they are equal to machine precision. It would be good if you could attach the full log, because I think that one interesting part where the values of the “f" and "g" function change sign has been

Re: [deal.II] LineMinimization and p-Laplace

Hi Bruno and Jean Thanks a lot for the answers. Sorry to reply this late, was busy with other PhD duties. I did have a look at KINSOL when encountered the problem for the first time, I think it would be a convenient tool for more stable nonlinear problems. @Jean: here is the dealllog outpu

Re: [deal.II] LineMinimization and p-Laplace

Hi Julie, So as you know from the error message, the assertion on this line is being triggered. The fit function is called from this section of code

[deal.II] LineMinimization and p-Laplace

Dear all, I am trying to solve a p-Laplace Dirichlet problem with zero boundary and used step-15 as the base. The code works well for p=1.1-2.9 with Newton and standard linesearch procedure. But when p>=3 the program diverges, continuation method brought me to p=2.99 but not beyond. Recently I