[dune-pdelab] Getting linear solver reduction from newton method

[Amir Peiraviminaei]

Hi everyone,
I'm using Newton method to solve a system of PDEs,
using PDESolver = Dune::PDELab::Newton<IGO, LS, U>;
Normally I get the first defect and final defect form
PDESolver.result().first_defect and PDESolver.result().defect, but I don't
know how to get defects in between.
For example, if newton method converges in 5 iterations then how one can
get defect_1, defect_2, .. , defect_4?

Best wishes,
Amir
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