#include "petscksp.h" PetscErrorCode PETSCKSP_DLLEXPORT KSPSTCGGetQuadratic(KSP ksp,PetscReal *quadratic)q(s) = g^T * s + 0.5 * s^T * H * s
which satisfies the trust region constraint
|| s ||_M <= radius,
where
radius is the trust region radius, g is the gradient vector, and H is the Hessian matrix, M is the positive definite preconditioner matrix.
Collective on KSP
Level:advanced
Location:src/ksp/ksp/impls/cg/stcg/stcg.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages