Date: 2023-01-26T12:18:36+00:00

Actual source code: dvdimprovex.c
slepc-3.18.2 2023-01-26
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */
     10: /*
     11:    SLEPc eigensolver: "davidson"

     13:    Step: improve the eigenvectors X
     14: */

     16: #include "davidson.h"
     17: #include <slepcblaslapack.h>

     19: /**** JD update step (I - Kfg'/(g'Kf)) K(A - sB) (I - Kfg'/(g'Kf)) t = (I - Kfg'/(g'Kf))r  ****/

     21: typedef struct {
     22:   PetscInt     size_X;
     23:   KSP          ksp;                /* correction equation solver */
     24:   Vec          friends;            /* reference vector for composite vectors */
     25:   PetscScalar  theta[4],thetai[2]; /* the shifts used in the correction eq. */
     26:   PetscInt     maxits;             /* maximum number of iterations */
     27:   PetscInt     r_s,r_e;            /* the selected eigenpairs to improve */
     28:   PetscInt     ksp_max_size;       /* the ksp maximum subvectors size */
     29:   PetscReal    tol;                /* the maximum solution tolerance */
     30:   PetscReal    lastTol;            /* last tol for dynamic stopping criterion */
     31:   PetscReal    fix;                /* tolerance for using the approx. eigenvalue */
     32:   PetscBool    dynamic;            /* if the dynamic stopping criterion is applied */
     33:   dvdDashboard *d;                 /* the current dvdDashboard reference */
     34:   PC           old_pc;             /* old pc in ksp */
     35:   BV           KZ;                 /* KZ vecs for the projector KZ*inv(X'*KZ)*X' */
     36:   BV           U;                  /* new X vectors */
     37:   PetscScalar  *XKZ;               /* X'*KZ */
     38:   PetscScalar  *iXKZ;              /* inverse of XKZ */
     39:   PetscInt     ldXKZ;              /* leading dimension of XKZ */
     40:   PetscInt     size_iXKZ;          /* size of iXKZ */
     41:   PetscInt     ldiXKZ;             /* leading dimension of iXKZ */
     42:   PetscInt     size_cX;            /* last value of d->size_cX */
     43:   PetscInt     old_size_X;         /* last number of improved vectors */
     44:   PetscBLASInt *iXKZPivots;        /* array of pivots */
     45: } dvdImprovex_jd;

     47: /*
     48:    Compute (I - KZ*iXKZ*X')*V where,
     49:    V, the vectors to apply the projector,
     50:    cV, the number of vectors in V,
     51: */
     52: static PetscErrorCode dvd_improvex_apply_proj(dvdDashboard *d,Vec *V,PetscInt cV)
     53: {
     54:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;
     55:   PetscInt       i,ldh,k,l;
     56:   PetscScalar    *h;
     57:   PetscBLASInt   cV_,n,info,ld;
     58: #if defined(PETSC_USE_COMPLEX)
     59:   PetscInt       j;
     60: #endif

     62:   PetscAssert(cV<=2,PETSC_COMM_SELF,PETSC_ERR_PLIB,"Consistency broken");

     64:   /* h <- X'*V */
     65:   PetscMalloc1(data->size_iXKZ*cV,&h);
     66:   ldh = data->size_iXKZ;
     67:   BVGetActiveColumns(data->U,&l,&k);
     68:   PetscAssert(ldh==k,PETSC_COMM_SELF,PETSC_ERR_PLIB,"Consistency broken");
     69:   BVSetActiveColumns(data->U,0,k);
     70:   for (i=0;i<cV;i++) {
     71:     BVDotVec(data->U,V[i],&h[ldh*i]);
     72: #if defined(PETSC_USE_COMPLEX)
     73:     for (j=0; j<k; j++) h[ldh*i+j] = PetscConj(h[ldh*i+j]);
     74: #endif
     75:   }
     76:   BVSetActiveColumns(data->U,l,k);

     78:   /* h <- iXKZ\h */
     79:   PetscBLASIntCast(cV,&cV_);
     80:   PetscBLASIntCast(data->size_iXKZ,&n);
     81:   PetscBLASIntCast(data->ldiXKZ,&ld);
     82:   PetscFPTrapPush(PETSC_FP_TRAP_OFF);
     83:   PetscCallBLAS("LAPACKgetrs",LAPACKgetrs_("N",&n,&cV_,data->iXKZ,&ld,data->iXKZPivots,h,&n,&info));
     84:   PetscFPTrapPop();
     85:   SlepcCheckLapackInfo("getrs",info);

     87:   /* V <- V - KZ*h */
     88:   BVSetActiveColumns(data->KZ,0,k);
     89:   for (i=0;i<cV;i++) BVMultVec(data->KZ,-1.0,1.0,V[i],&h[ldh*i]);
     90:   BVSetActiveColumns(data->KZ,l,k);
     91:   PetscFree(h);
     92:   return 0;
     93: }

     95: /*
     96:    Compute (I - X*iXKZ*KZ')*V where,
     97:    V, the vectors to apply the projector,
     98:    cV, the number of vectors in V,
     99: */
    100: static PetscErrorCode dvd_improvex_applytrans_proj(dvdDashboard *d,Vec *V,PetscInt cV)
    101: {
    102:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;
    103:   PetscInt       i,ldh,k,l;
    104:   PetscScalar    *h;
    105:   PetscBLASInt   cV_, n, info, ld;
    106: #if defined(PETSC_USE_COMPLEX)
    107:   PetscInt       j;
    108: #endif

    110:   PetscAssert(cV<=2,PETSC_COMM_SELF,PETSC_ERR_PLIB,"Consistency broken");

    112:   /* h <- KZ'*V */
    113:   PetscMalloc1(data->size_iXKZ*cV,&h);
    114:   ldh = data->size_iXKZ;
    115:   BVGetActiveColumns(data->U,&l,&k);
    116:   PetscAssert(ldh==k,PETSC_COMM_SELF,PETSC_ERR_PLIB,"Consistency broken");
    117:   BVSetActiveColumns(data->KZ,0,k);
    118:   for (i=0;i<cV;i++) {
    119:     BVDotVec(data->KZ,V[i],&h[ldh*i]);
    120: #if defined(PETSC_USE_COMPLEX)
    121:     for (j=0;j<k;j++) h[ldh*i+j] = PetscConj(h[ldh*i+j]);
    122: #endif
    123:   }
    124:   BVSetActiveColumns(data->KZ,l,k);

    126:   /* h <- iXKZ\h */
    127:   PetscBLASIntCast(cV,&cV_);
    128:   PetscBLASIntCast(data->size_iXKZ,&n);
    129:   PetscBLASIntCast(data->ldiXKZ,&ld);
    130:   PetscFPTrapPush(PETSC_FP_TRAP_OFF);
    131:   PetscCallBLAS("LAPACKgetrs",LAPACKgetrs_("C",&n,&cV_,data->iXKZ,&ld,data->iXKZPivots,h,&n,&info));
    132:   PetscFPTrapPop();
    133:   SlepcCheckLapackInfo("getrs",info);

    135:   /* V <- V - U*h */
    136:   BVSetActiveColumns(data->U,0,k);
    137:   for (i=0;i<cV;i++) BVMultVec(data->U,-1.0,1.0,V[i],&h[ldh*i]);
    138:   BVSetActiveColumns(data->U,l,k);
    139:   PetscFree(h);
    140:   return 0;
    141: }

    143: static PetscErrorCode dvd_improvex_jd_end(dvdDashboard *d)
    144: {
    145:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;

    147:   VecDestroy(&data->friends);

    149:   /* Restore the pc of ksp */
    150:   if (data->old_pc) {
    151:     KSPSetPC(data->ksp, data->old_pc);
    152:     PCDestroy(&data->old_pc);
    153:   }
    154:   return 0;
    155: }

    157: static PetscErrorCode dvd_improvex_jd_d(dvdDashboard *d)
    158: {
    159:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;

    161:   /* Free local data and objects */
    162:   PetscFree(data->XKZ);
    163:   PetscFree(data->iXKZ);
    164:   PetscFree(data->iXKZPivots);
    165:   BVDestroy(&data->KZ);
    166:   BVDestroy(&data->U);
    167:   PetscFree(data);
    168:   return 0;
    169: }

    171: /*
    172:    y <- theta[1]A*x - theta[0]*B*x
    173:    auxV, two auxiliary vectors
    174:  */
    175: static inline PetscErrorCode dvd_aux_matmult(dvdImprovex_jd *data,const Vec *x,const Vec *y)
    176: {
    177:   PetscInt       n,i;
    178:   const Vec      *Bx;
    179:   Vec            *auxV;

    181:   n = data->r_e - data->r_s;
    182:   for (i=0;i<n;i++) MatMult(data->d->A,x[i],y[i]);

    184:   SlepcVecPoolGetVecs(data->d->auxV,2,&auxV);
    185:   for (i=0;i<n;i++) {
    186: #if !defined(PETSC_USE_COMPLEX)
    187:     if (PetscUnlikely(data->d->eigi[data->r_s+i] != 0.0)) {
    188:       if (data->d->B) {
    189:         MatMult(data->d->B,x[i],auxV[0]);
    190:         MatMult(data->d->B,x[i+1],auxV[1]);
    191:         Bx = auxV;
    192:       } else Bx = &x[i];

    194:       /* y_i   <- [ t_2i+1*A*x_i   - t_2i*Bx_i + ti_i*Bx_i+1;
    195:          y_i+1      t_2i+1*A*x_i+1 - ti_i*Bx_i - t_2i*Bx_i+1  ] */
    196:       VecAXPBYPCZ(y[i],-data->theta[2*i],data->thetai[i],data->theta[2*i+1],Bx[0],Bx[1]);
    197:       VecAXPBYPCZ(y[i+1],-data->thetai[i],-data->theta[2*i],data->theta[2*i+1],Bx[0],Bx[1]);
    198:       i++;
    199:     } else
    200: #endif
    201:     {
    202:       if (data->d->B) {
    203:         MatMult(data->d->B,x[i],auxV[0]);
    204:         Bx = auxV;
    205:       } else Bx = &x[i];
    206:       VecAXPBY(y[i],-data->theta[i*2],data->theta[i*2+1],Bx[0]);
    207:     }
    208:   }
    209:   SlepcVecPoolRestoreVecs(data->d->auxV,2,&auxV);
    210:   return 0;
    211: }

    213: /*
    214:    y <- theta[1]'*A'*x - theta[0]'*B'*x
    215:  */
    216: static inline PetscErrorCode dvd_aux_matmulttrans(dvdImprovex_jd *data,const Vec *x,const Vec *y)
    217: {
    218:   PetscInt       n,i;
    219:   const Vec      *Bx;
    220:   Vec            *auxV;

    222:   n = data->r_e - data->r_s;
    223:   for (i=0;i<n;i++) MatMultTranspose(data->d->A,x[i],y[i]);

    225:   SlepcVecPoolGetVecs(data->d->auxV,2,&auxV);
    226:   for (i=0;i<n;i++) {
    227: #if !defined(PETSC_USE_COMPLEX)
    228:     if (data->d->eigi[data->r_s+i] != 0.0) {
    229:       if (data->d->B) {
    230:         MatMultTranspose(data->d->B,x[i],auxV[0]);
    231:         MatMultTranspose(data->d->B,x[i+1],auxV[1]);
    232:         Bx = auxV;
    233:       } else Bx = &x[i];

    235:       /* y_i   <- [ t_2i+1*A*x_i   - t_2i*Bx_i - ti_i*Bx_i+1;
    236:          y_i+1      t_2i+1*A*x_i+1 + ti_i*Bx_i - t_2i*Bx_i+1  ] */
    237:       VecAXPBYPCZ(y[i],-data->theta[2*i],-data->thetai[i],data->theta[2*i+1],Bx[0],Bx[1]);
    238:       VecAXPBYPCZ(y[i+1],data->thetai[i],-data->theta[2*i],data->theta[2*i+1],Bx[0],Bx[1]);
    239:       i++;
    240:     } else
    241: #endif
    242:     {
    243:       if (data->d->B) {
    244:         MatMultTranspose(data->d->B,x[i],auxV[0]);
    245:         Bx = auxV;
    246:       } else Bx = &x[i];
    247:       VecAXPBY(y[i],PetscConj(-data->theta[i*2]),PetscConj(data->theta[i*2+1]),Bx[0]);
    248:     }
    249:   }
    250:   SlepcVecPoolRestoreVecs(data->d->auxV,2,&auxV);
    251:   return 0;
    252: }

    254: static PetscErrorCode PCApplyBA_dvd(PC pc,PCSide side,Vec in,Vec out,Vec w)
    255: {
    256:   dvdImprovex_jd *data;
    257:   PetscInt       n,i;
    258:   const Vec      *inx,*outx,*wx;
    259:   Vec            *auxV;
    260:   Mat            A;

    262:   PCGetOperators(pc,&A,NULL);
    263:   MatShellGetContext(A,&data);
    264:   VecCompGetSubVecs(in,NULL,&inx);
    265:   VecCompGetSubVecs(out,NULL,&outx);
    266:   VecCompGetSubVecs(w,NULL,&wx);
    267:   n = data->r_e - data->r_s;
    268:   SlepcVecPoolGetVecs(data->d->auxV,n,&auxV);
    269:   switch (side) {
    270:   case PC_LEFT:
    271:     /* aux <- theta[1]A*in - theta[0]*B*in */
    272:     dvd_aux_matmult(data,inx,auxV);

    274:     /* out <- K * aux */
    275:     for (i=0;i<n;i++) data->d->improvex_precond(data->d,data->r_s+i,auxV[i],outx[i]);
    276:     break;
    277:   case PC_RIGHT:
    278:     /* aux <- K * in */
    279:     for (i=0;i<n;i++) data->d->improvex_precond(data->d,data->r_s+i,inx[i],auxV[i]);

    281:     /* out <- theta[1]A*auxV - theta[0]*B*auxV */
    282:     dvd_aux_matmult(data,auxV,outx);
    283:     break;
    284:   case PC_SYMMETRIC:
    285:     /* aux <- K^{1/2} * in */
    286:     for (i=0;i<n;i++) PCApplySymmetricRight(data->old_pc,inx[i],auxV[i]);

    288:     /* wx <- theta[1]A*auxV - theta[0]*B*auxV */
    289:     dvd_aux_matmult(data,auxV,wx);

    291:     /* aux <- K^{1/2} * in */
    292:     for (i=0;i<n;i++) PCApplySymmetricLeft(data->old_pc,wx[i],outx[i]);
    293:     break;
    294:   default:
    295:     SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported KSP side");
    296:   }
    297:   /* out <- out - v*(u'*out) */
    298:   dvd_improvex_apply_proj(data->d,(Vec*)outx,n);
    299:   SlepcVecPoolRestoreVecs(data->d->auxV,n,&auxV);
    300:   return 0;
    301: }

    303: static PetscErrorCode PCApply_dvd(PC pc,Vec in,Vec out)
    304: {
    305:   dvdImprovex_jd *data;
    306:   PetscInt       n,i;
    307:   const Vec      *inx, *outx;
    308:   Mat            A;

    310:   PCGetOperators(pc,&A,NULL);
    311:   MatShellGetContext(A,&data);
    312:   VecCompGetSubVecs(in,NULL,&inx);
    313:   VecCompGetSubVecs(out,NULL,&outx);
    314:   n = data->r_e - data->r_s;
    315:   /* out <- K * in */
    316:   for (i=0;i<n;i++) data->d->improvex_precond(data->d,data->r_s+i,inx[i],outx[i]);
    317:   /* out <- out - v*(u'*out) */
    318:   dvd_improvex_apply_proj(data->d,(Vec*)outx,n);
    319:   return 0;
    320: }

    322: static PetscErrorCode PCApplyTranspose_dvd(PC pc,Vec in,Vec out)
    323: {
    324:   dvdImprovex_jd *data;
    325:   PetscInt       n,i;
    326:   const Vec      *inx, *outx;
    327:   Vec            *auxV;
    328:   Mat            A;

    330:   PCGetOperators(pc,&A,NULL);
    331:   MatShellGetContext(A,&data);
    332:   VecCompGetSubVecs(in,NULL,&inx);
    333:   VecCompGetSubVecs(out,NULL,&outx);
    334:   n = data->r_e - data->r_s;
    335:   SlepcVecPoolGetVecs(data->d->auxV,n,&auxV);
    336:   /* auxV <- in */
    337:   for (i=0;i<n;i++) VecCopy(inx[i],auxV[i]);
    338:   /* auxV <- auxV - u*(v'*auxV) */
    339:   dvd_improvex_applytrans_proj(data->d,auxV,n);
    340:   /* out <- K' * aux */
    341:   for (i=0;i<n;i++) PCApplyTranspose(data->old_pc,auxV[i],outx[i]);
    342:   SlepcVecPoolRestoreVecs(data->d->auxV,n,&auxV);
    343:   return 0;
    344: }

    346: static PetscErrorCode MatMult_dvd_jd(Mat A,Vec in,Vec out)
    347: {
    348:   dvdImprovex_jd *data;
    349:   PetscInt       n;
    350:   const Vec      *inx, *outx;
    351:   PCSide         side;

    353:   MatShellGetContext(A,&data);
    354:   VecCompGetSubVecs(in,NULL,&inx);
    355:   VecCompGetSubVecs(out,NULL,&outx);
    356:   n = data->r_e - data->r_s;
    357:   /* out <- theta[1]A*in - theta[0]*B*in */
    358:   dvd_aux_matmult(data,inx,outx);
    359:   KSPGetPCSide(data->ksp,&side);
    360:   if (side == PC_RIGHT) {
    361:     /* out <- out - v*(u'*out) */
    362:     dvd_improvex_apply_proj(data->d,(Vec*)outx,n);
    363:   }
    364:   return 0;
    365: }

    367: static PetscErrorCode MatMultTranspose_dvd_jd(Mat A,Vec in,Vec out)
    368: {
    369:   dvdImprovex_jd *data;
    370:   PetscInt       n,i;
    371:   const Vec      *inx,*outx,*r;
    372:   Vec            *auxV;
    373:   PCSide         side;

    375:   MatShellGetContext(A,&data);
    376:   VecCompGetSubVecs(in,NULL,&inx);
    377:   VecCompGetSubVecs(out,NULL,&outx);
    378:   n = data->r_e - data->r_s;
    379:   KSPGetPCSide(data->ksp,&side);
    380:   if (side == PC_RIGHT) {
    381:     /* auxV <- in */
    382:     SlepcVecPoolGetVecs(data->d->auxV,n,&auxV);
    383:     for (i=0;i<n;i++) VecCopy(inx[i],auxV[i]);
    384:     /* auxV <- auxV - v*(u'*auxV) */
    385:     dvd_improvex_applytrans_proj(data->d,auxV,n);
    386:     r = auxV;
    387:   } else r = inx;
    388:   /* out <- theta[1]A*r - theta[0]*B*r */
    389:   dvd_aux_matmulttrans(data,r,outx);
    390:   if (side == PC_RIGHT) SlepcVecPoolRestoreVecs(data->d->auxV,n,&auxV);
    391:   return 0;
    392: }

    394: static PetscErrorCode MatCreateVecs_dvd_jd(Mat A,Vec *right,Vec *left)
    395: {
    396:   Vec            *r,*l;
    397:   dvdImprovex_jd *data;
    398:   PetscInt       n,i;

    400:   MatShellGetContext(A,&data);
    401:   n = data->ksp_max_size;
    402:   if (right) PetscMalloc1(n,&r);
    403:   if (left) PetscMalloc1(n,&l);
    404:   for (i=0;i<n;i++) MatCreateVecs(data->d->A,right?&r[i]:NULL,left?&l[i]:NULL);
    405:   if (right) {
    406:     VecCreateCompWithVecs(r,n,data->friends,right);
    407:     for (i=0;i<n;i++) VecDestroy(&r[i]);
    408:   }
    409:   if (left) {
    410:     VecCreateCompWithVecs(l,n,data->friends,left);
    411:     for (i=0;i<n;i++) VecDestroy(&l[i]);
    412:   }

    414:   if (right) PetscFree(r);
    415:   if (left) PetscFree(l);
    416:   return 0;
    417: }

    419: static PetscErrorCode dvd_improvex_jd_start(dvdDashboard *d)
    420: {
    421:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;
    422:   PetscInt       rA, cA, rlA, clA;
    423:   Mat            A;
    424:   PetscBool      t;
    425:   PC             pc;
    426:   Vec            v0[2];

    428:   data->size_cX = data->old_size_X = 0;
    429:   data->lastTol = data->dynamic?0.5:0.0;

    431:   /* Setup the ksp */
    432:   if (data->ksp) {
    433:     /* Create the reference vector */
    434:     BVGetColumn(d->eps->V,0,&v0[0]);
    435:     v0[1] = v0[0];
    436:     VecCreateCompWithVecs(v0,data->ksp_max_size,NULL,&data->friends);
    437:     BVRestoreColumn(d->eps->V,0,&v0[0]);

    439:     /* Save the current pc and set a PCNONE */
    440:     KSPGetPC(data->ksp, &data->old_pc);
    441:     PetscObjectTypeCompare((PetscObject)data->old_pc,PCNONE,&t);
    442:     data->lastTol = 0.5;
    443:     if (t) data->old_pc = NULL;
    444:     else {
    445:       PetscObjectReference((PetscObject)data->old_pc);
    446:       PCCreate(PetscObjectComm((PetscObject)d->eps),&pc);
    447:       PCSetType(pc,PCSHELL);
    448:       PCSetOperators(pc,d->A,d->A);
    449:       PCSetReusePreconditioner(pc,PETSC_TRUE);
    450:       PCShellSetApply(pc,PCApply_dvd);
    451:       PCShellSetApplyBA(pc,PCApplyBA_dvd);
    452:       PCShellSetApplyTranspose(pc,PCApplyTranspose_dvd);
    453:       KSPSetPC(data->ksp,pc);
    454:       PCDestroy(&pc);
    455:     }

    457:     /* Create the (I-v*u')*K*(A-s*B) matrix */
    458:     MatGetSize(d->A,&rA,&cA);
    459:     MatGetLocalSize(d->A,&rlA,&clA);
    460:     MatCreateShell(PetscObjectComm((PetscObject)d->A),rlA*data->ksp_max_size,clA*data->ksp_max_size,rA*data->ksp_max_size,cA*data->ksp_max_size,data,&A);
    461:     MatShellSetOperation(A,MATOP_MULT,(void(*)(void))MatMult_dvd_jd);
    462:     MatShellSetOperation(A,MATOP_MULT_TRANSPOSE,(void(*)(void))MatMultTranspose_dvd_jd);
    463:     MatShellSetOperation(A,MATOP_CREATE_VECS,(void(*)(void))MatCreateVecs_dvd_jd);

    465:     /* Try to avoid KSPReset */
    466:     KSPGetOperatorsSet(data->ksp,&t,NULL);
    467:     if (t) {
    468:       Mat      M;
    469:       PetscInt rM;
    470:       KSPGetOperators(data->ksp,&M,NULL);
    471:       MatGetSize(M,&rM,NULL);
    472:       if (rM != rA*data->ksp_max_size) KSPReset(data->ksp);
    473:     }
    474:     EPS_KSPSetOperators(data->ksp,A,A);
    475:     KSPSetReusePreconditioner(data->ksp,PETSC_TRUE);
    476:     KSPSetUp(data->ksp);
    477:     MatDestroy(&A);
    478:   } else {
    479:     data->old_pc = NULL;
    480:     data->friends = NULL;
    481:   }
    482:   BVSetActiveColumns(data->KZ,0,0);
    483:   BVSetActiveColumns(data->U,0,0);
    484:   return 0;
    485: }

    487: /*
    488:   Compute: u <- X, v <- K*(theta[0]*A+theta[1]*B)*X,
    489:   kr <- K^{-1}*(A-eig*B)*X, being X <- V*pX[i_s..i_e-1], Y <- W*pY[i_s..i_e-1]
    490:   where
    491:   pX,pY, the right and left eigenvectors of the projected system
    492:   ld, the leading dimension of pX and pY
    493: */
    494: static PetscErrorCode dvd_improvex_jd_proj_cuv(dvdDashboard *d,PetscInt i_s,PetscInt i_e,Vec *kr,PetscScalar *theta,PetscScalar *thetai,PetscScalar *pX,PetscScalar *pY,PetscInt ld)
    495: {
    496:   PetscInt          n=i_e-i_s,size_KZ,V_new,rm,i,lv,kv,lKZ,kKZ;
    497:   dvdImprovex_jd    *data = (dvdImprovex_jd*)d->improveX_data;
    498:   const PetscScalar *array;
    499:   Mat               M;
    500:   Vec               u[2],v[2];
    501:   PetscBLASInt      s,ldXKZ,info;

    503:   /* Check consistency */
    504:   BVGetActiveColumns(d->eps->V,&lv,&kv);
    505:   V_new = lv - data->size_cX;
    506:   PetscAssert(V_new<=data->old_size_X,PETSC_COMM_SELF,PETSC_ERR_PLIB,"Consistency broken");
    507:   data->old_size_X = n;
    508:   data->size_cX = lv;

    510:   /* KZ <- KZ(rm:rm+max_cX-1) */
    511:   BVGetActiveColumns(data->KZ,&lKZ,&kKZ);
    512:   rm = PetscMax(V_new+lKZ,0);
    513:   if (rm > 0) {
    514:     for (i=0;i<lKZ;i++) {
    515:       BVCopyColumn(data->KZ,i+rm,i);
    516:       BVCopyColumn(data->U,i+rm,i);
    517:     }
    518:   }

    520:   /* XKZ <- XKZ(rm:rm+max_cX-1,rm:rm+max_cX-1) */
    521:   if (rm > 0) {
    522:     for (i=0;i<lKZ;i++) PetscArraycpy(&data->XKZ[i*data->ldXKZ+i],&data->XKZ[(i+rm)*data->ldXKZ+i+rm],lKZ);
    523:   }
    524:   lKZ = PetscMin(0,lKZ+V_new);
    525:   BVSetActiveColumns(data->KZ,lKZ,lKZ+n);
    526:   BVSetActiveColumns(data->U,lKZ,lKZ+n);

    528:   /* Compute X, KZ and KR */
    529:   BVGetColumn(data->U,lKZ,u);
    530:   if (n>1) BVGetColumn(data->U,lKZ+1,&u[1]);
    531:   BVGetColumn(data->KZ,lKZ,v);
    532:   if (n>1) BVGetColumn(data->KZ,lKZ+1,&v[1]);
    533:   d->improvex_jd_proj_uv(d,i_s,i_e,u,v,kr,theta,thetai,pX,pY,ld);
    534:   BVRestoreColumn(data->U,lKZ,u);
    535:   if (n>1) BVRestoreColumn(data->U,lKZ+1,&u[1]);
    536:   BVRestoreColumn(data->KZ,lKZ,v);
    537:   if (n>1) BVRestoreColumn(data->KZ,lKZ+1,&v[1]);

    539:   /* XKZ <- U'*KZ */
    540:   MatCreateSeqDense(PETSC_COMM_SELF,lKZ+n,lKZ+n,NULL,&M);
    541:   BVMatProject(data->KZ,NULL,data->U,M);
    542:   MatDenseGetArrayRead(M,&array);
    543:   for (i=lKZ;i<lKZ+n;i++) { /* upper part */
    544:     PetscArraycpy(&data->XKZ[data->ldXKZ*i],&array[i*(lKZ+n)],lKZ);
    545:   }
    546:   for (i=0;i<lKZ+n;i++) { /* lower part */
    547:     PetscArraycpy(&data->XKZ[data->ldXKZ*i+lKZ],&array[i*(lKZ+n)+lKZ],n);
    548:   }
    549:   MatDenseRestoreArrayRead(M,&array);
    550:   MatDestroy(&M);

    552:   /* iXKZ <- inv(XKZ) */
    553:   size_KZ = lKZ+n;
    554:   PetscBLASIntCast(lKZ+n,&s);
    555:   data->ldiXKZ = data->size_iXKZ = size_KZ;
    556:   for (i=0;i<size_KZ;i++) PetscArraycpy(&data->iXKZ[data->ldiXKZ*i],&data->XKZ[data->ldXKZ*i],size_KZ);
    557:   PetscBLASIntCast(data->ldiXKZ,&ldXKZ);
    558:   PetscFPTrapPush(PETSC_FP_TRAP_OFF);
    559:   PetscCallBLAS("LAPACKgetrf",LAPACKgetrf_(&s,&s,data->iXKZ,&ldXKZ,data->iXKZPivots,&info));
    560:   PetscFPTrapPop();
    561:   SlepcCheckLapackInfo("getrf",info);
    562:   return 0;
    563: }

    565: static PetscErrorCode dvd_improvex_jd_gen(dvdDashboard *d,PetscInt r_s,PetscInt r_e,PetscInt *size_D)
    566: {
    567:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;
    568:   PetscInt       i,j,n,maxits,maxits0,lits,s,ld,k,max_size_D,lV,kV;
    569:   PetscScalar    *pX,*pY;
    570:   PetscReal      tol,tol0;
    571:   Vec            *kr,kr_comp,D_comp,D[2],kr0[2];
    572:   PetscBool      odd_situation = PETSC_FALSE;

    574:   BVGetActiveColumns(d->eps->V,&lV,&kV);
    575:   max_size_D = d->eps->ncv-kV;
    576:   /* Quick exit */
    577:   if ((max_size_D == 0) || r_e-r_s <= 0) {
    578:    *size_D = 0;
    579:     return 0;
    580:   }

    582:   n = PetscMin(PetscMin(data->size_X, max_size_D), r_e-r_s);
    583:   PetscAssert(n>0,PETSC_COMM_SELF,PETSC_ERR_PLIB,"n == 0");
    584:   PetscAssert(data->size_X>=r_e-r_s,PETSC_COMM_SELF,PETSC_ERR_PLIB,"size_X < r_e-r_s");

    586:   DSGetLeadingDimension(d->eps->ds,&ld);

    588:   /* Restart lastTol if a new pair converged */
    589:   if (data->dynamic && data->size_cX < lV)
    590:     data->lastTol = 0.5;

    592:   for (i=0,s=0;i<n;i+=s) {
    593:     /* If the selected eigenvalue is complex, but the arithmetic is real... */
    594: #if !defined(PETSC_USE_COMPLEX)
    595:     if (d->eigi[r_s+i] != 0.0) {
    596:       if (i+2 <= max_size_D) s=2;
    597:       else break;
    598:     } else
    599: #endif
    600:       s=1;

    602:     data->r_s = r_s+i;
    603:     data->r_e = r_s+i+s;
    604:     SlepcVecPoolGetVecs(d->auxV,s,&kr);

    606:     /* Compute theta, maximum iterations and tolerance */
    607:     maxits = 0;
    608:     tol = 1;
    609:     for (j=0;j<s;j++) {
    610:       d->improvex_jd_lit(d,r_s+i+j,&data->theta[2*j],&data->thetai[j],&maxits0,&tol0);
    611:       maxits += maxits0;
    612:       tol *= tol0;
    613:     }
    614:     maxits/= s;
    615:     tol = data->dynamic?data->lastTol:PetscExpReal(PetscLogReal(tol)/s);

    617:     /* Compute u, v and kr */
    618:     k = r_s+i;
    619:     DSVectors(d->eps->ds,DS_MAT_X,&k,NULL);
    620:     k = r_s+i;
    621:     DSVectors(d->eps->ds,DS_MAT_Y,&k,NULL);
    622:     DSGetArray(d->eps->ds,DS_MAT_X,&pX);
    623:     DSGetArray(d->eps->ds,DS_MAT_Y,&pY);
    624:     dvd_improvex_jd_proj_cuv(d,r_s+i,r_s+i+s,kr,data->theta,data->thetai,pX,pY,ld);
    625:     DSRestoreArray(d->eps->ds,DS_MAT_X,&pX);
    626:     DSRestoreArray(d->eps->ds,DS_MAT_Y,&pY);

    628:     /* Check if the first eigenpairs are converged */
    629:     if (i == 0) {
    630:       PetscInt oldnpreconv = d->npreconv;
    631:       d->preTestConv(d,0,r_s+s,r_s+s,&d->npreconv);
    632:       if (d->npreconv > oldnpreconv) break;
    633:     }

    635:     /* Test the odd situation of solving Ax=b with A=I */
    636: #if !defined(PETSC_USE_COMPLEX)
    637:     odd_situation = (data->ksp && data->theta[0] == 1. && data->theta[1] == 0. && data->thetai[0] == 0. && d->B == NULL)? PETSC_TRUE: PETSC_FALSE;
    638: #else
    639:     odd_situation = (data->ksp && data->theta[0] == 1. && data->theta[1] == 0. && d->B == NULL)? PETSC_TRUE: PETSC_FALSE;
    640: #endif
    641:     /* If JD */
    642:     if (data->ksp && !odd_situation) {
    643:       /* kr <- -kr */
    644:       for (j=0;j<s;j++) VecScale(kr[j],-1.0);

    646:       /* Compose kr and D */
    647:       kr0[0] = kr[0];
    648:       kr0[1] = (s==2 ? kr[1] : NULL);
    649:       VecCreateCompWithVecs(kr0,data->ksp_max_size,data->friends,&kr_comp);
    650:       BVGetColumn(d->eps->V,kV+i,&D[0]);
    651:       if (s==2) BVGetColumn(d->eps->V,kV+i+1,&D[1]);
    652:       else D[1] = NULL;
    653:       VecCreateCompWithVecs(D,data->ksp_max_size,data->friends,&D_comp);
    654:       VecCompSetSubVecs(data->friends,s,NULL);

    656:       /* Solve the correction equation */
    657:       KSPSetTolerances(data->ksp,tol,PETSC_DEFAULT,PETSC_DEFAULT,maxits);
    658:       KSPSolve(data->ksp,kr_comp,D_comp);
    659:       KSPGetIterationNumber(data->ksp,&lits);

    661:       /* Destroy the composed ks and D */
    662:       VecDestroy(&kr_comp);
    663:       VecDestroy(&D_comp);
    664:       BVRestoreColumn(d->eps->V,kV+i,&D[0]);
    665:       if (s==2) BVRestoreColumn(d->eps->V,kV+i+1,&D[1]);

    667:     /* If GD */
    668:     } else {
    669:       BVGetColumn(d->eps->V,kV+i,&D[0]);
    670:       if (s==2) BVGetColumn(d->eps->V,kV+i+1,&D[1]);
    671:       for (j=0;j<s;j++) d->improvex_precond(d,r_s+i+j,kr[j],D[j]);
    672:       dvd_improvex_apply_proj(d,D,s);
    673:       BVRestoreColumn(d->eps->V,kV+i,&D[0]);
    674:       if (s==2) BVRestoreColumn(d->eps->V,kV+i+1,&D[1]);
    675:     }
    676:     /* Prevent that short vectors are discarded in the orthogonalization */
    677:     if (i == 0 && d->eps->errest[d->nconv+r_s] > PETSC_MACHINE_EPSILON && d->eps->errest[d->nconv+r_s] < PETSC_MAX_REAL) {
    678:       for (j=0;j<s;j++) BVScaleColumn(d->eps->V,kV+i+j,1.0/d->eps->errest[d->nconv+r_s]);
    679:     }
    680:     SlepcVecPoolRestoreVecs(d->auxV,s,&kr);
    681:   }
    682:   *size_D = i;
    683:   if (data->dynamic) data->lastTol = PetscMax(data->lastTol/2.0,PETSC_MACHINE_EPSILON*10.0);
    684:   return 0;
    685: }

    687: PetscErrorCode dvd_improvex_jd(dvdDashboard *d,dvdBlackboard *b,KSP ksp,PetscInt max_bs,PetscBool dynamic)
    688: {
    689:   dvdImprovex_jd *data;
    690:   PetscBool      useGD;
    691:   PC             pc;
    692:   PetscInt       size_P;

    694:   /* Setting configuration constrains */
    695:   PetscObjectTypeCompare((PetscObject)ksp,KSPPREONLY,&useGD);

    697:   /* If the arithmetic is real and the problem is not Hermitian, then
    698:      the block size is incremented in one */
    699: #if !defined(PETSC_USE_COMPLEX)
    700:   if (!DVD_IS(d->sEP,DVD_EP_HERMITIAN)) {
    701:     max_bs++;
    702:     b->max_size_P = PetscMax(b->max_size_P,2);
    703:   } else
    704: #endif
    705:   {
    706:     b->max_size_P = PetscMax(b->max_size_P,1);
    707:   }
    708:   b->max_size_X = PetscMax(b->max_size_X,max_bs);
    709:   size_P = b->max_size_P;

    711:   /* Setup the preconditioner */
    712:   if (ksp) {
    713:     KSPGetPC(ksp,&pc);
    714:     dvd_static_precond_PC(d,b,pc);
    715:   } else dvd_static_precond_PC(d,b,NULL);

    717:   /* Setup the step */
    718:   if (b->state >= DVD_STATE_CONF) {
    719:     PetscNew(&data);
    720:     data->dynamic = dynamic;
    721:     PetscMalloc1(size_P*size_P,&data->XKZ);
    722:     PetscMalloc1(size_P*size_P,&data->iXKZ);
    723:     PetscMalloc1(size_P,&data->iXKZPivots);
    724:     data->ldXKZ = size_P;
    725:     data->size_X = b->max_size_X;
    726:     d->improveX_data = data;
    727:     data->ksp = useGD? NULL: ksp;
    728:     data->d = d;
    729:     d->improveX = dvd_improvex_jd_gen;
    730: #if !defined(PETSC_USE_COMPLEX)
    731:     if (!DVD_IS(d->sEP,DVD_EP_HERMITIAN)) data->ksp_max_size = 2;
    732:     else
    733: #endif
    734:       data->ksp_max_size = 1;
    735:     /* Create various vector basis */
    736:     BVDuplicateResize(d->eps->V,size_P,&data->KZ);
    737:     BVSetMatrix(data->KZ,NULL,PETSC_FALSE);
    738:     BVDuplicate(data->KZ,&data->U);

    740:     EPSDavidsonFLAdd(&d->startList,dvd_improvex_jd_start);
    741:     EPSDavidsonFLAdd(&d->endList,dvd_improvex_jd_end);
    742:     EPSDavidsonFLAdd(&d->destroyList,dvd_improvex_jd_d);
    743:   }
    744:   return 0;
    745: }

    747: #if !defined(PETSC_USE_COMPLEX)
    748: static inline PetscErrorCode dvd_complex_rayleigh_quotient(Vec ur,Vec ui,Vec Axr,Vec Axi,Vec Bxr,Vec Bxi,PetscScalar *eigr,PetscScalar *eigi)
    749: {
    750:   PetscScalar    rAr,iAr,rAi,iAi,rBr,iBr,rBi,iBi,b0,b2,b4,b6,b7;

    752:   /* eigr = [(rAr+iAi)*(rBr+iBi) + (rAi-iAr)*(rBi-iBr)]/k
    753:      eigi = [(rAi-iAr)*(rBr+iBi) - (rAr+iAi)*(rBi-iBr)]/k
    754:      k    =  (rBr+iBi)*(rBr+iBi) + (rBi-iBr)*(rBi-iBr)    */
    755:   VecDotBegin(Axr,ur,&rAr); /* r*A*r */
    756:   VecDotBegin(Axr,ui,&iAr); /* i*A*r */
    757:   VecDotBegin(Axi,ur,&rAi); /* r*A*i */
    758:   VecDotBegin(Axi,ui,&iAi); /* i*A*i */
    759:   VecDotBegin(Bxr,ur,&rBr); /* r*B*r */
    760:   VecDotBegin(Bxr,ui,&iBr); /* i*B*r */
    761:   VecDotBegin(Bxi,ur,&rBi); /* r*B*i */
    762:   VecDotBegin(Bxi,ui,&iBi); /* i*B*i */
    763:   VecDotEnd(Axr,ur,&rAr); /* r*A*r */
    764:   VecDotEnd(Axr,ui,&iAr); /* i*A*r */
    765:   VecDotEnd(Axi,ur,&rAi); /* r*A*i */
    766:   VecDotEnd(Axi,ui,&iAi); /* i*A*i */
    767:   VecDotEnd(Bxr,ur,&rBr); /* r*B*r */
    768:   VecDotEnd(Bxr,ui,&iBr); /* i*B*r */
    769:   VecDotEnd(Bxi,ur,&rBi); /* r*B*i */
    770:   VecDotEnd(Bxi,ui,&iBi); /* i*B*i */
    771:   b0 = rAr+iAi; /* rAr+iAi */
    772:   b2 = rAi-iAr; /* rAi-iAr */
    773:   b4 = rBr+iBi; /* rBr+iBi */
    774:   b6 = rBi-iBr; /* rBi-iBr */
    775:   b7 = b4*b4 + b6*b6; /* k */
    776:   *eigr = (b0*b4 + b2*b6) / b7; /* eig_r */
    777:   *eigi = (b2*b4 - b0*b6) / b7; /* eig_i */
    778:   return 0;
    779: }
    780: #endif

    782: static inline PetscErrorCode dvd_compute_n_rr(PetscInt i_s,PetscInt n,PetscScalar *eigr,PetscScalar *eigi,Vec *u,Vec *Ax,Vec *Bx)
    783: {
    784:   PetscInt       i;
    785:   PetscScalar    b0,b1;

    787:   for (i=0; i<n; i++) {
    788: #if !defined(PETSC_USE_COMPLEX)
    789:     if (eigi[i_s+i] != 0.0) {
    790:       PetscScalar eigr0=0.0,eigi0=0.0;
    791:       dvd_complex_rayleigh_quotient(u[i],u[i+1],Ax[i],Ax[i+1],Bx[i],Bx[i+1],&eigr0,&eigi0);
    792:       if (PetscAbsScalar(eigr[i_s+i]-eigr0)/PetscAbsScalar(eigr[i_s+i]) > 1e-10 || PetscAbsScalar(eigi[i_s+i]-eigi0)/PetscAbsScalar(eigi[i_s+i]) > 1e-10) PetscInfo(u[0],"The eigenvalue %g%+gi is far from its Rayleigh quotient value %g%+gi\n",(double)eigr[i_s+i],(double)eigi[i_s+i],(double)eigr0,(double)eigi0);
    793:       i++;
    794:     } else
    795: #endif
    796:     {
    797:       VecDotBegin(Ax[i],u[i],&b0);
    798:       VecDotBegin(Bx[i],u[i],&b1);
    799:       VecDotEnd(Ax[i],u[i],&b0);
    800:       VecDotEnd(Bx[i],u[i],&b1);
    801:       b0 = b0/b1;
    802:       if (PetscAbsScalar(eigr[i_s+i]-b0)/PetscAbsScalar(eigr[i_s+i]) > 1e-10) PetscInfo(u[0],"The eigenvalue %g+%g is far from its Rayleigh quotient value %g+%g\n",(double)PetscRealPart(eigr[i_s+i]),(double)PetscImaginaryPart(eigr[i_s+i]),(double)PetscRealPart(b0),(double)PetscImaginaryPart(b0));
    803:     }
    804:   }
    805:   return 0;
    806: }

    808: /*
    809:   Compute: u <- X, v <- K*(theta[0]*A+theta[1]*B)*X,
    810:   kr <- K^{-1}*(A-eig*B)*X, being X <- V*pX[i_s..i_e-1], Y <- W*pY[i_s..i_e-1]
    811:   where
    812:   pX,pY, the right and left eigenvectors of the projected system
    813:   ld, the leading dimension of pX and pY
    814: */
    815: PetscErrorCode dvd_improvex_jd_proj_uv_KZX(dvdDashboard *d,PetscInt i_s,PetscInt i_e,Vec *u,Vec *v,Vec *kr,PetscScalar *theta,PetscScalar *thetai,PetscScalar *pX,PetscScalar *pY,PetscInt ld)
    816: {
    817:   PetscInt       n = i_e-i_s,i;
    818:   PetscScalar    *b;
    819:   Vec            *Ax,*Bx,*r;
    820:   Mat            M;
    821:   BV             X;

    823:   BVDuplicateResize(d->eps->V,4,&X);
    824:   MatCreateSeqDense(PETSC_COMM_SELF,4,4,NULL,&M);
    825:   /* u <- X(i) */
    826:   dvd_improvex_compute_X(d,i_s,i_e,u,pX,ld);

    828:   /* v <- theta[0]A*u + theta[1]*B*u */

    830:   /* Bx <- B*X(i) */
    831:   Bx = kr;
    832:   if (d->BX) {
    833:     for (i=i_s; i<i_e; ++i) BVMultVec(d->BX,1.0,0.0,Bx[i-i_s],&pX[ld*i]);
    834:   } else {
    835:     for (i=0;i<n;i++) {
    836:       if (d->B) MatMult(d->B, u[i], Bx[i]);
    837:       else VecCopy(u[i], Bx[i]);
    838:     }
    839:   }

    841:   /* Ax <- A*X(i) */
    842:   SlepcVecPoolGetVecs(d->auxV,i_e-i_s,&r);
    843:   Ax = r;
    844:   for (i=i_s; i<i_e; ++i) BVMultVec(d->AX,1.0,0.0,Ax[i-i_s],&pX[ld*i]);

    846:   /* v <- Y(i) */
    847:   for (i=i_s; i<i_e; ++i) BVMultVec(d->W?d->W:d->eps->V,1.0,0.0,v[i-i_s],&pY[ld*i]);

    849:   /* Recompute the eigenvalue */
    850:   dvd_compute_n_rr(i_s,n,d->eigr,d->eigi,v,Ax,Bx);

    852:   for (i=0;i<n;i++) {
    853: #if !defined(PETSC_USE_COMPLEX)
    854:     if (d->eigi[i_s+i] != 0.0) {
    855:       /* [r_i r_i+1 kr_i kr_i+1]*= [ theta_2i'    0            1        0
    856:                                        0         theta_2i'     0        1
    857:                                      theta_2i+1 -thetai_i   -eigr_i -eigi_i
    858:                                      thetai_i    theta_2i+1  eigi_i -eigr_i ] */
    859:       MatDenseGetArrayWrite(M,&b);
    860:       b[0] = b[5] = PetscConj(theta[2*i]);
    861:       b[2] = b[7] = -theta[2*i+1];
    862:       b[6] = -(b[3] = thetai[i]);
    863:       b[1] = b[4] = 0.0;
    864:       b[8] = b[13] = 1.0/d->nX[i_s+i];
    865:       b[10] = b[15] = -d->eigr[i_s+i]/d->nX[i_s+i];
    866:       b[14] = -(b[11] = d->eigi[i_s+i]/d->nX[i_s+i]);
    867:       b[9] = b[12] = 0.0;
    868:       MatDenseRestoreArrayWrite(M,&b);
    869:       BVInsertVec(X,0,Ax[i]);
    870:       BVInsertVec(X,1,Ax[i+1]);
    871:       BVInsertVec(X,2,Bx[i]);
    872:       BVInsertVec(X,3,Bx[i+1]);
    873:       BVSetActiveColumns(X,0,4);
    874:       BVMultInPlace(X,M,0,4);
    875:       BVCopyVec(X,0,Ax[i]);
    876:       BVCopyVec(X,1,Ax[i+1]);
    877:       BVCopyVec(X,2,Bx[i]);
    878:       BVCopyVec(X,3,Bx[i+1]);
    879:       i++;
    880:     } else
    881: #endif
    882:     {
    883:       /* [Ax_i Bx_i]*= [ theta_2i'    1/nX_i
    884:                         theta_2i+1  -eig_i/nX_i ] */
    885:       MatDenseGetArrayWrite(M,&b);
    886:       b[0] = PetscConj(theta[i*2]);
    887:       b[1] = theta[i*2+1];
    888:       b[4] = 1.0/d->nX[i_s+i];
    889:       b[5] = -d->eigr[i_s+i]/d->nX[i_s+i];
    890:       MatDenseRestoreArrayWrite(M,&b);
    891:       BVInsertVec(X,0,Ax[i]);
    892:       BVInsertVec(X,1,Bx[i]);
    893:       BVSetActiveColumns(X,0,2);
    894:       BVMultInPlace(X,M,0,2);
    895:       BVCopyVec(X,0,Ax[i]);
    896:       BVCopyVec(X,1,Bx[i]);
    897:     }
    898:   }
    899:   for (i=0; i<n; i++) d->nX[i_s+i] = 1.0;

    901:   /* v <- K^{-1} r = K^{-1}(theta_2i'*Ax + theta_2i+1*Bx) */
    902:   for (i=0;i<n;i++) d->improvex_precond(d,i_s+i,r[i],v[i]);
    903:   SlepcVecPoolRestoreVecs(d->auxV,i_e-i_s,&r);

    905:   /* kr <- P*(Ax - eig_i*Bx) */
    906:   d->calcpairs_proj_res(d,i_s,i_e,kr);
    907:   BVDestroy(&X);
    908:   MatDestroy(&M);
    909:   return 0;
    910: }

    912: static PetscErrorCode dvd_improvex_jd_lit_const_0(dvdDashboard *d,PetscInt i,PetscScalar* theta,PetscScalar* thetai,PetscInt *maxits,PetscReal *tol)
    913: {
    914:   dvdImprovex_jd *data = (dvdImprovex_jd*)d->improveX_data;
    915:   PetscReal      a;

    917:   a = SlepcAbsEigenvalue(d->eigr[i],d->eigi[i]);

    919:   if (d->nR[i] < data->fix*a) {
    920:     theta[0] = d->eigr[i];
    921:     theta[1] = 1.0;
    922: #if !defined(PETSC_USE_COMPLEX)
    923:     *thetai = d->eigi[i];
    924: #endif
    925:   } else {
    926:     theta[0] = d->target[0];
    927:     theta[1] = d->target[1];
    928: #if !defined(PETSC_USE_COMPLEX)
    929:     *thetai = 0.0;
    930: #endif
    931: }

    933: #if defined(PETSC_USE_COMPLEX)
    934:   if (thetai) *thetai = 0.0;
    935: #endif
    936:   *maxits = data->maxits;
    937:   *tol = data->tol;
    938:   return 0;
    939: }

    941: PetscErrorCode dvd_improvex_jd_lit_const(dvdDashboard *d,dvdBlackboard *b,PetscInt maxits,PetscReal tol,PetscReal fix)
    942: {
    943:   dvdImprovex_jd  *data = (dvdImprovex_jd*)d->improveX_data;

    945:   /* Setup the step */
    946:   if (b->state >= DVD_STATE_CONF) {
    947:     data->maxits = maxits;
    948:     data->tol = tol;
    949:     data->fix = fix;
    950:     d->improvex_jd_lit = dvd_improvex_jd_lit_const_0;
    951:   }
    952:   return 0;
    953: }

    955: PetscErrorCode dvd_improvex_jd_proj_uv(dvdDashboard *d,dvdBlackboard *b)
    956: {
    957:   /* Setup the step */
    958:   if (b->state >= DVD_STATE_CONF) {
    959:     d->improvex_jd_proj_uv = dvd_improvex_jd_proj_uv_KZX;
    960:   }
    961:   return 0;
    962: }

    964: PetscErrorCode dvd_improvex_compute_X(dvdDashboard *d,PetscInt i_s,PetscInt i_e,Vec *u_,PetscScalar *pX,PetscInt ld)
    965: {
    966:   PetscInt       n = i_e - i_s,i;
    967:   Vec            *u;

    969:   if (u_) u = u_;
    970:   else if (d->correctXnorm) SlepcVecPoolGetVecs(d->auxV,i_e-i_s,&u);
    971:   if (u_ || d->correctXnorm) {
    972:     for (i=0;i<n;i++) BVMultVec(d->eps->V,1.0,0.0,u[i],&pX[ld*(i+i_s)]);
    973:   }
    974:   /* nX(i) <- ||X(i)|| */
    975:   if (d->correctXnorm) {
    976:     for (i=0;i<n;i++) VecNormBegin(u[i],NORM_2,&d->nX[i_s+i]);
    977:     for (i=0;i<n;i++) VecNormEnd(u[i],NORM_2,&d->nX[i_s+i]);
    978: #if !defined(PETSC_USE_COMPLEX)
    979:     for (i=0;i<n;i++) {
    980:       if (d->eigi[i_s+i] != 0.0) {
    981:         d->nX[i_s+i] = d->nX[i_s+i+1] = PetscSqrtScalar(d->nX[i_s+i]*d->nX[i_s+i]+d->nX[i_s+i+1]*d->nX[i_s+i+1]);
    982:         i++;
    983:       }
    984:     }
    985: #endif
    986:   } else {
    987:     for (i=0;i<n;i++) d->nX[i_s+i] = 1.0;
    988:   }
    989:   if (d->correctXnorm && !u_) SlepcVecPoolRestoreVecs(d->auxV,i_e-i_s,&u);
    990:   return 0;
    991: }