xref: /petsc/src/tao/bound/impls/bqnk/bqnktr.c (revision 5753113e6c2e3d3881d4bf9bd87b746e7987b172)

#include <../src/tao/bound/impls/bqnk/bqnk.h>
#include <petscksp.h>

static PetscErrorCode TaoSetUp_BQNKTR(Tao tao)
{
  KSP       ksp;
  PetscBool valid;

  PetscFunctionBegin;
  PetscCall(TaoSetUp_BQNK(tao));
  PetscCall(TaoGetKSP(tao, &ksp));
  PetscCall(PetscObjectHasFunction((PetscObject)ksp, "KSPCGSetRadius_C", &valid));
  PetscCheck(valid, PetscObjectComm((PetscObject)tao), PETSC_ERR_SUP, "Not for KSP type %s. Must use a trust-region CG method for KSP (e.g. KSPNASH, KSPSTCG, KSPGLTR)", ((PetscObject)ksp)->type_name);
  PetscFunctionReturn(PETSC_SUCCESS);
}

/*MC
  TAOBQNKTR - Bounded Quasi-Newton-Krylov Trust Region method for nonlinear minimization with
              bound constraints. This method approximates the Hessian-vector product using a
              limited-memory quasi-Newton formula, and iteratively inverts the Hessian with a
              Krylov solver. The quasi-Newton matrix and its settings can be accessed via the
              prefix `-tao_bqnk_`. For options database, see TAOBNK

  Level: beginner

.seealso: `Tao`, `TaoType`, `TAOBNK`, `TAOBQNKTR`, `TAOBQNKLS`
M*/
PETSC_EXTERN PetscErrorCode TaoCreate_BQNKTR(Tao tao)
{
  TAO_BNK  *bnk;
  TAO_BQNK *bqnk;

  PetscFunctionBegin;
  PetscCall(TaoCreate_BQNK(tao));
  tao->ops->setup = TaoSetUp_BQNKTR;
  bnk             = (TAO_BNK *)tao->data;
  bqnk            = (TAO_BQNK *)bnk->ctx;
  bqnk->solve     = TaoSolve_BNTR;
  PetscFunctionReturn(PETSC_SUCCESS);
}