Distinguish strategy failures and expose the actual trial tangent

2026-09-17 10:09:22 -04:00
parent 5f3eb0b18c
commit 2e31917269
6 changed files with 152 additions and 13 deletions
--- a/libmeanfield/interface/solver/newton.cppm
+++ b/libmeanfield/interface/solver/newton.cppm
@@ -265,6 +265,9 @@ export namespace mean_field::solver::nonlinear {
        std::span<const mfem::real_t> candidatePhysicalState{};
        std::span<const mfem::real_t> candidateNormalizedState{};
        std::span<const mfem::real_t> candidateNormalizedResidual{};
+        // A curved trial path cannot recover its Newton tangent by dividing
+        // the candidate displacement by alpha. Observers borrow it directly.
+        std::span<const mfem::real_t> normalizedDirection{};
    };

    struct AfterIteration final {