Actual source code: stcgimpl.h

  1: /*
  2:    Context for using preconditioned conjugate gradient method to minimized a
  3:    quadratic function subject to a trust region constraint.  If the matrix
  4:    is indefinite, a direction of negative curvature may be encountered.  If
  5:    a direction of negative curvature is found, then we follow it to the
  6:    boundary of the trust region.

  8:    This method is described in:
  9:      T. Steihaug, "The Conjugate Gradient Method and Trust Regions in Large
 10:        Scale Optimization", SIAM Journal on Numerical Analysis, 20,
 11:        pages 626-637, 1983.
 12: */

 14: #pragma once

 16: #include <petsc/private/kspimpl.h>

 18: typedef struct {
 19:   PetscReal radius;
 20:   PetscReal norm_d;
 21:   PetscReal o_fcn;
 22:   PetscInt  dtype;
 23: } KSPCG_STCG;