Actual source code: dvd_initv.c

  1: /*
  2:   SLEPc eigensolver: "davidson"

  4:   Step: init subspace V

  6:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  7:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  8:    Copyright (c) 2002-2013, Universitat Politecnica de Valencia, Spain

 10:    This file is part of SLEPc.

 12:    SLEPc is free software: you can redistribute it and/or modify it under  the
 13:    terms of version 3 of the GNU Lesser General Public License as published by
 14:    the Free Software Foundation.

 16:    SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
 17:    WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
 18:    FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
 19:    more details.

 21:    You  should have received a copy of the GNU Lesser General  Public  License
 22:    along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
 23:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 24: */

 26:  #include davidson.h

 28: PetscErrorCode dvd_initV_classic_0(dvdDashboard *d);
 29: PetscErrorCode dvd_initV_krylov_0(dvdDashboard *d);
 30: PetscErrorCode dvd_initV_d(dvdDashboard *d);

 32: typedef struct {
 33:   PetscInt k,           /* desired initial subspace size */
 34:   user;                 /* number of user initial vectors */
 35:   void *old_initV_data; /* old initV data */
 36: } dvdInitV;

 40: PetscErrorCode dvd_initV(dvdDashboard *d, dvdBlackboard *b, PetscInt k,PetscInt user, PetscBool krylov)
 41: {
 42:   PetscErrorCode  ierr;
 43:   dvdInitV        *data;

 46:   /* Setting configuration constrains */
 47:   b->max_size_V = PetscMax(b->max_size_V, k);
 48:   if (krylov)
 49:     b->max_size_auxV = PetscMax(b->max_size_auxV, 1);

 51:   /* Setup the step */
 52:   if (b->state >= DVD_STATE_CONF) {
 53:     PetscMalloc(sizeof(dvdInitV),&data);
 54:     PetscLogObjectMemory(d->eps,sizeof(dvdInitV));
 55:     data->k = k;
 56:     data->user = PetscMin(k, user);
 57:     data->old_initV_data = d->initV_data;
 58:     d->initV_data = data;
 59:     if (krylov) {
 60:       d->initV = dvd_initV_krylov_0;
 61:     } else {
 62:       d->initV = dvd_initV_classic_0;
 63:     }
 64:     DVD_FL_ADD(d->destroyList, dvd_initV_d);
 65:   }
 66:   return(0);
 67: }

 71: PetscErrorCode dvd_initV_classic_0(dvdDashboard *d)
 72: {
 73:   PetscErrorCode  ierr;
 74:   dvdInitV        *data = (dvdInitV*)d->initV_data;
 75:   PetscInt        i, user = PetscMin(data->user, d->max_size_V),
 76:                   k = PetscMin(data->k, d->max_size_V);

 79:   /* Generate a set of random initial vectors and orthonormalize them */
 80:   for (i=user; i<k; i++) {
 81:     SlepcVecSetRandom(d->V[i],d->eps->rand);
 82:   }
 83:   d->V_tra_s = 0; d->V_tra_e = 0;
 84:   d->V_new_s = 0; d->V_new_e = i;

 86:   /* After that the user vectors will be destroyed */
 87:   data->user = 0;
 88:   return(0);
 89: }

 93: PetscErrorCode dvd_initV_krylov_0(dvdDashboard *d)
 94: {
 95:   PetscErrorCode  ierr;
 96:   dvdInitV        *data = (dvdInitV*)d->initV_data;
 97:   PetscInt        i, user = PetscMin(data->user, d->max_size_V),
 98:                   k = PetscMin(data->k, d->max_size_V);
 99:   Vec             *cX = d->BcX? d->BcX : ((d->cY && !d->W)? d->cY : d->cX);

102:   /* If needed, generate a random vector for starting the arnoldi method */
103:   if (user == 0) {
104:     SlepcVecSetRandom(d->V[0], d->eps->rand);
105:     user = 1;
106:   }

108:   /* Perform k steps of Arnoldi with the operator K^{-1}*(t[1]*A-t[2]*B) */
109:   dvd_orthV(d->ipV, d->eps->defl, d->eps->nds, cX, d->size_cX, d->V, 0,
110:                    user, d->auxS, d->eps->rand);
111:   for (i=user; i<k; i++) {
112:     /* aux <- theta[1]A*in - theta[0]*B*in */
113:     if (d->B) {
114:       MatMult(d->A, d->V[i-user], d->V[i]);
115:       MatMult(d->B, d->V[i-user], d->auxV[0]);
116:       VecAXPBY(d->auxV[0], d->target[1], -d->target[0], d->V[i]);
117:     } else {
118:       MatMult(d->A, d->V[i-user], d->auxV[0]);
119:       VecAXPBY(d->auxV[0], -d->target[0], d->target[1], d->V[i-user]);
120:     }
121:     d->improvex_precond(d, 0, d->auxV[0], d->V[i]);
122:     dvd_orthV(d->ipV, d->eps->defl, d->eps->nds, cX, d->size_cX, d->V, i,
123:                      i+1, d->auxS, d->eps->rand);
124:   }

126:   d->V_tra_s = 0; d->V_tra_e = 0;
127:   d->V_new_s = 0; d->V_new_e = i;

129:   /* After that the user vectors will be destroyed */
130:   data->user = 0;
131:   return(0);
132: }

136: PetscErrorCode dvd_initV_d(dvdDashboard *d)
137: {
138:   PetscErrorCode  ierr;
139:   dvdInitV        *data = (dvdInitV*)d->initV_data;

142:   /* Restore changes in dvdDashboard */
143:   d->initV_data = data->old_initV_data;

145:   /* Free local data */
146:   PetscFree(data);
147:   return(0);
148: }