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.                                             */
      7: /*                                                                           */
      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: /*****************************************************************************/

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

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

     26: #endif