Date: 2022-08-02T03:15:17+00:00

Actual source code: parabolic.c

      1: #include <petsc/private/taoimpl.h>

      3: typedef struct {
      4:   PetscInt n; /*  Number of variables */
      5:   PetscInt m; /*  Number of constraints per time step */
      6:   PetscInt mx; /*  grid points in each direction */
      7:   PetscInt nt; /*  Number of time steps; as of now, must be divisible by 8 */
      8:   PetscInt ndata; /*  Number of data points per sample */
      9:   PetscInt ns; /*  Number of samples */
     10:   PetscInt *sample_times; /*  Times of samples */
     11:   IS       s_is;
     12:   IS       d_is;

     14:   VecScatter state_scatter;
     15:   VecScatter design_scatter;
     16:   VecScatter *yi_scatter;
     17:   VecScatter *di_scatter;

     19:   Mat       Js,Jd,JsBlockPrec,JsInv,JsBlock;
     20:   PetscBool jformed,dsg_formed;

     22:   PetscReal alpha; /*  Regularization parameter */
     23:   PetscReal beta; /*  Weight attributed to ||u||^2 in regularization functional */
     24:   PetscReal noise; /*  Amount of noise to add to data */
     25:   PetscReal ht; /*  Time step */

     27:   Mat Qblock,QblockT;
     28:   Mat L,LT;
     29:   Mat Div,Divwork;
     30:   Mat Grad;
     31:   Mat Av,Avwork,AvT;
     32:   Mat DSG;
     33:   Vec q;
     34:   Vec ur; /*  reference */

     36:   Vec d;
     37:   Vec dwork;
     38:   Vec *di;

     40:   Vec y; /*  state variables */
     41:   Vec ywork;

     43:   Vec ytrue;
     44:   Vec *yi,*yiwork;

     46:   Vec u; /*  design variables */
     47:   Vec uwork;

     49:   Vec utrue;
     50:   Vec js_diag;
     51:   Vec c; /*  constraint vector */
     52:   Vec cwork;

     54:   Vec lwork;
     55:   Vec S;
     56:   Vec Rwork,Swork,Twork;
     57:   Vec Av_u;

     59:   KSP solver;
     60:   PC prec;

     62:   PetscInt ksp_its;
     63:   PetscInt ksp_its_initial;
     64: } AppCtx;

     66: PetscErrorCode FormFunction(Tao, Vec, PetscReal*, void*);
     67: PetscErrorCode FormGradient(Tao, Vec, Vec, void*);
     68: PetscErrorCode FormFunctionGradient(Tao, Vec, PetscReal*, Vec, void*);
     69: PetscErrorCode FormJacobianState(Tao, Vec, Mat, Mat, Mat, void*);
     70: PetscErrorCode FormJacobianDesign(Tao, Vec, Mat, void*);
     71: PetscErrorCode FormConstraints(Tao, Vec, Vec, void*);
     72: PetscErrorCode FormHessian(Tao, Vec, Mat, Mat, void*);
     73: PetscErrorCode Gather(Vec x, Vec state, VecScatter s_scat, Vec design, VecScatter d_scat);
     74: PetscErrorCode Scatter(Vec x, Vec state, VecScatter s_scat, Vec design, VecScatter d_scat);
     75: PetscErrorCode ParabolicInitialize(AppCtx *user);
     76: PetscErrorCode ParabolicDestroy(AppCtx *user);
     77: PetscErrorCode ParabolicMonitor(Tao, void*);

     79: PetscErrorCode StateMatMult(Mat,Vec,Vec);
     80: PetscErrorCode StateMatBlockMult(Mat,Vec,Vec);
     81: PetscErrorCode StateMatMultTranspose(Mat,Vec,Vec);
     82: PetscErrorCode StateMatGetDiagonal(Mat,Vec);
     83: PetscErrorCode StateMatDuplicate(Mat,MatDuplicateOption,Mat*);
     84: PetscErrorCode StateMatInvMult(Mat,Vec,Vec);
     85: PetscErrorCode StateMatInvTransposeMult(Mat,Vec,Vec);
     86: PetscErrorCode StateMatBlockPrecMult(PC,Vec,Vec);

     88: PetscErrorCode DesignMatMult(Mat,Vec,Vec);
     89: PetscErrorCode DesignMatMultTranspose(Mat,Vec,Vec);

     91: PetscErrorCode Gather_i(Vec,Vec*,VecScatter*,PetscInt);
     92: PetscErrorCode Scatter_i(Vec,Vec*,VecScatter*,PetscInt);

     94: static  char help[]="";

     96: int main(int argc, char **argv)
     97: {
     98:   PetscErrorCode     ierr;
     99:   Vec                x,x0;
    100:   Tao                tao;
    101:   AppCtx             user;
    102:   IS                 is_allstate,is_alldesign;
    103:   PetscInt           lo,hi,hi2,lo2,ksp_old;
    104:   PetscInt           ntests = 1;
    105:   PetscInt           i;
    106: #if defined(PETSC_USE_LOG)
    107:   PetscLogStage      stages[1];
    108: #endif

    110:   PetscInitialize(&argc, &argv, (char*)0,help);
    111:   user.mx = 8;
    112:   PetscOptionsBegin(PETSC_COMM_WORLD,NULL,"parabolic example",NULL);
    113:   PetscOptionsInt("-mx","Number of grid points in each direction","",user.mx,&user.mx,NULL);
    114:   user.nt = 8;
    115:   PetscOptionsInt("-nt","Number of time steps","",user.nt,&user.nt,NULL);
    116:   user.ndata = 64;
    117:   PetscOptionsInt("-ndata","Numbers of data points per sample","",user.ndata,&user.ndata,NULL);
    118:   user.ns = 8;
    119:   PetscOptionsInt("-ns","Number of samples","",user.ns,&user.ns,NULL);
    120:   user.alpha = 1.0;
    121:   PetscOptionsReal("-alpha","Regularization parameter","",user.alpha,&user.alpha,NULL);
    122:   user.beta = 0.01;
    123:   PetscOptionsReal("-beta","Weight attributed to ||u||^2 in regularization functional","",user.beta,&user.beta,NULL);
    124:   user.noise = 0.01;
    125:   PetscOptionsReal("-noise","Amount of noise to add to data","",user.noise,&user.noise,NULL);
    126:   PetscOptionsInt("-ntests","Number of times to repeat TaoSolve","",ntests,&ntests,NULL);
    127:   PetscOptionsEnd();

    129:   user.m = user.mx*user.mx*user.mx; /*  number of constraints per time step */
    130:   user.n = user.m*(user.nt+1); /*  number of variables */
    131:   user.ht = (PetscReal)1/user.nt;

    133:   VecCreate(PETSC_COMM_WORLD,&user.u);
    134:   VecCreate(PETSC_COMM_WORLD,&user.y);
    135:   VecCreate(PETSC_COMM_WORLD,&user.c);
    136:   VecSetSizes(user.u,PETSC_DECIDE,user.n-user.m*user.nt);
    137:   VecSetSizes(user.y,PETSC_DECIDE,user.m*user.nt);
    138:   VecSetSizes(user.c,PETSC_DECIDE,user.m*user.nt);
    139:   VecSetFromOptions(user.u);
    140:   VecSetFromOptions(user.y);
    141:   VecSetFromOptions(user.c);

    143:   /* Create scatters for reduced spaces.
    144:      If the state vector y and design vector u are partitioned as
    145:      [y_1; y_2; ...; y_np] and [u_1; u_2; ...; u_np] (with np = # of processors),
    146:      then the solution vector x is organized as
    147:      [y_1; u_1; y_2; u_2; ...; y_np; u_np].
    148:      The index sets user.s_is and user.d_is correspond to the indices of the
    149:      state and design variables owned by the current processor.
    150:   */
    151:   VecCreate(PETSC_COMM_WORLD,&x);

    153:   VecGetOwnershipRange(user.y,&lo,&hi);
    154:   VecGetOwnershipRange(user.u,&lo2,&hi2);

    156:   ISCreateStride(PETSC_COMM_SELF,hi-lo,lo,1,&is_allstate);
    157:   ISCreateStride(PETSC_COMM_SELF,hi-lo,lo+lo2,1,&user.s_is);

    159:   ISCreateStride(PETSC_COMM_SELF,hi2-lo2,lo2,1,&is_alldesign);
    160:   ISCreateStride(PETSC_COMM_SELF,hi2-lo2,hi+lo2,1,&user.d_is);

    162:   VecSetSizes(x,hi-lo+hi2-lo2,user.n);
    163:   VecSetFromOptions(x);

    165:   VecScatterCreate(x,user.s_is,user.y,is_allstate,&user.state_scatter);
    166:   VecScatterCreate(x,user.d_is,user.u,is_alldesign,&user.design_scatter);
    167:   ISDestroy(&is_alldesign);
    168:   ISDestroy(&is_allstate);

    170:   /* Create TAO solver and set desired solution method */
    171:   TaoCreate(PETSC_COMM_WORLD,&tao);
    172:   TaoSetType(tao,TAOLCL);

    174:   /* Set up initial vectors and matrices */
    175:   ParabolicInitialize(&user);

    177:   Gather(x,user.y,user.state_scatter,user.u,user.design_scatter);
    178:   VecDuplicate(x,&x0);
    179:   VecCopy(x,x0);

    181:   /* Set solution vector with an initial guess */
    182:   TaoSetSolution(tao,x);
    183:   TaoSetObjective(tao, FormFunction, &user);
    184:   TaoSetGradient(tao, NULL, FormGradient, &user);
    185:   TaoSetConstraintsRoutine(tao, user.c, FormConstraints, &user);

    187:   TaoSetJacobianStateRoutine(tao, user.Js, user.JsBlockPrec, user.JsInv, FormJacobianState, &user);
    188:   TaoSetJacobianDesignRoutine(tao, user.Jd, FormJacobianDesign, &user);

    190:   TaoSetFromOptions(tao);
    191:   TaoSetStateDesignIS(tao,user.s_is,user.d_is);

    193:  /* SOLVE THE APPLICATION */
    194:   PetscLogStageRegister("Trials",&stages[0]);
    195:   PetscLogStagePush(stages[0]);
    196:   user.ksp_its_initial = user.ksp_its;
    197:   ksp_old = user.ksp_its;
    198:   for (i=0; i<ntests; i++) {
    199:     TaoSolve(tao);
    200:     PetscPrintf(PETSC_COMM_WORLD,"KSP Iterations = %D\n",user.ksp_its-ksp_old);
    201:     VecCopy(x0,x);
    202:     TaoSetSolution(tao,x);
    203:   }
    204:   PetscLogStagePop();
    205:   PetscBarrier((PetscObject)x);
    206:   PetscPrintf(PETSC_COMM_WORLD,"KSP iterations within initialization: ");
    207:   PetscPrintf(PETSC_COMM_WORLD,"%D\n",user.ksp_its_initial);
    208:   PetscPrintf(PETSC_COMM_WORLD,"Total KSP iterations over %D trial(s): ",ntests);
    209:   PetscPrintf(PETSC_COMM_WORLD,"%D\n",user.ksp_its);
    210:   PetscPrintf(PETSC_COMM_WORLD,"KSP iterations per trial: ");
    211:   PetscPrintf(PETSC_COMM_WORLD,"%D\n",(user.ksp_its-user.ksp_its_initial)/ntests);

    213:   TaoDestroy(&tao);
    214:   VecDestroy(&x);
    215:   VecDestroy(&x0);
    216:   ParabolicDestroy(&user);

    218:   PetscFinalize();
    219:   return 0;
    220: }
    221: /* ------------------------------------------------------------------- */
    222: /*
    223:    dwork = Qy - d
    224:    lwork = L*(u-ur)
    225:    f = 1/2 * (dwork.dork + alpha*lwork.lwork)
    226: */
    227: PetscErrorCode FormFunction(Tao tao,Vec X,PetscReal *f,void *ptr)
    228: {
    229:   PetscReal      d1=0,d2=0;
    230:   PetscInt       i,j;
    231:   AppCtx         *user = (AppCtx*)ptr;

    233:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    234:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    235:   for (j=0; j<user->ns; j++) {
    236:     i = user->sample_times[j];
    237:     MatMult(user->Qblock,user->yi[i],user->di[j]);
    238:   }
    239:   Gather_i(user->dwork,user->di,user->di_scatter,user->ns);
    240:   VecAXPY(user->dwork,-1.0,user->d);
    241:   VecDot(user->dwork,user->dwork,&d1);

    243:   VecWAXPY(user->uwork,-1.0,user->ur,user->u);
    244:   MatMult(user->L,user->uwork,user->lwork);
    245:   VecDot(user->lwork,user->lwork,&d2);

    247:   *f = 0.5 * (d1 + user->alpha*d2);
    248:   return 0;
    249: }

    251: /* ------------------------------------------------------------------- */
    252: /*
    253:     state: g_s = Q' *(Qy - d)
    254:     design: g_d = alpha*L'*L*(u-ur)
    255: */
    256: PetscErrorCode FormGradient(Tao tao,Vec X,Vec G,void *ptr)
    257: {
    258:   PetscInt       i,j;
    259:   AppCtx         *user = (AppCtx*)ptr;

    261:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    262:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    263:   for (j=0; j<user->ns; j++) {
    264:     i = user->sample_times[j];
    265:     MatMult(user->Qblock,user->yi[i],user->di[j]);
    266:   }
    267:   Gather_i(user->dwork,user->di,user->di_scatter,user->ns);
    268:   VecAXPY(user->dwork,-1.0,user->d);
    269:   Scatter_i(user->dwork,user->di,user->di_scatter,user->ns);
    270:   VecSet(user->ywork,0.0);
    271:   Scatter_i(user->ywork,user->yiwork,user->yi_scatter,user->nt);
    272:   for (j=0; j<user->ns; j++) {
    273:     i = user->sample_times[j];
    274:     MatMult(user->QblockT,user->di[j],user->yiwork[i]);
    275:   }
    276:   Gather_i(user->ywork,user->yiwork,user->yi_scatter,user->nt);

    278:   VecWAXPY(user->uwork,-1.0,user->ur,user->u);
    279:   MatMult(user->L,user->uwork,user->lwork);
    280:   MatMult(user->LT,user->lwork,user->uwork);
    281:   VecScale(user->uwork, user->alpha);
    282:   Gather(G,user->ywork,user->state_scatter,user->uwork,user->design_scatter);
    283:   return 0;
    284: }

    286: PetscErrorCode FormFunctionGradient(Tao tao, Vec X, PetscReal *f, Vec G, void *ptr)
    287: {
    288:   PetscReal      d1,d2;
    289:   PetscInt       i,j;
    290:   AppCtx         *user = (AppCtx*)ptr;

    292:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    293:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    294:   for (j=0; j<user->ns; j++) {
    295:     i = user->sample_times[j];
    296:     MatMult(user->Qblock,user->yi[i],user->di[j]);
    297:   }
    298:   Gather_i(user->dwork,user->di,user->di_scatter,user->ns);
    299:   VecAXPY(user->dwork,-1.0,user->d);
    300:   VecDot(user->dwork,user->dwork,&d1);
    301:   Scatter_i(user->dwork,user->di,user->di_scatter,user->ns);
    302:   VecSet(user->ywork,0.0);
    303:   Scatter_i(user->ywork,user->yiwork,user->yi_scatter,user->nt);
    304:   for (j=0; j<user->ns; j++) {
    305:     i = user->sample_times[j];
    306:     MatMult(user->QblockT,user->di[j],user->yiwork[i]);
    307:   }
    308:   Gather_i(user->ywork,user->yiwork,user->yi_scatter,user->nt);

    310:   VecWAXPY(user->uwork,-1.0,user->ur,user->u);
    311:   MatMult(user->L,user->uwork,user->lwork);
    312:   VecDot(user->lwork,user->lwork,&d2);
    313:   MatMult(user->LT,user->lwork,user->uwork);
    314:   VecScale(user->uwork, user->alpha);
    315:   *f = 0.5 * (d1 + user->alpha*d2);

    317:   Gather(G,user->ywork,user->state_scatter,user->uwork,user->design_scatter);
    318:   return 0;
    319: }

    321: /* ------------------------------------------------------------------- */
    322: /* A
    323: MatShell object
    324: */
    325: PetscErrorCode FormJacobianState(Tao tao, Vec X, Mat J, Mat JPre, Mat JInv, void *ptr)
    326: {
    327:   AppCtx         *user = (AppCtx*)ptr;

    329:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    330:   VecSet(user->uwork,0);
    331:   VecAXPY(user->uwork,-1.0,user->u);
    332:   VecExp(user->uwork);
    333:   MatMult(user->Av,user->uwork,user->Av_u);
    334:   VecCopy(user->Av_u,user->Swork);
    335:   VecReciprocal(user->Swork);
    336:   MatCopy(user->Div,user->Divwork,SAME_NONZERO_PATTERN);
    337:   MatDiagonalScale(user->Divwork,NULL,user->Swork);
    338:   if (user->dsg_formed) {
    339:     MatProductNumeric(user->DSG);
    340:   } else {
    341:     MatMatMult(user->Divwork,user->Grad,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&user->DSG);
    342:     user->dsg_formed = PETSC_TRUE;
    343:   }

    345:   /* B = speye(nx^3) + ht*DSG; */
    346:   MatScale(user->DSG,user->ht);
    347:   MatShift(user->DSG,1.0);
    348:   return 0;
    349: }

    351: /* ------------------------------------------------------------------- */
    352: /* B */
    353: PetscErrorCode FormJacobianDesign(Tao tao, Vec X, Mat J, void *ptr)
    354: {
    355:   AppCtx         *user = (AppCtx*)ptr;

    357:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    358:   return 0;
    359: }

    361: PetscErrorCode StateMatMult(Mat J_shell, Vec X, Vec Y)
    362: {
    363:   PetscInt       i;
    364:   AppCtx         *user;

    366:   MatShellGetContext(J_shell,&user);
    367:   Scatter_i(X,user->yi,user->yi_scatter,user->nt);
    368:   MatMult(user->JsBlock,user->yi[0],user->yiwork[0]);
    369:   for (i=1; i<user->nt; i++) {
    370:     MatMult(user->JsBlock,user->yi[i],user->yiwork[i]);
    371:     VecAXPY(user->yiwork[i],-1.0,user->yi[i-1]);
    372:   }
    373:   Gather_i(Y,user->yiwork,user->yi_scatter,user->nt);
    374:   return 0;
    375: }

    377: PetscErrorCode StateMatMultTranspose(Mat J_shell, Vec X, Vec Y)
    378: {
    379:   PetscInt       i;
    380:   AppCtx         *user;

    382:   MatShellGetContext(J_shell,&user);
    383:   Scatter_i(X,user->yi,user->yi_scatter,user->nt);
    384:   for (i=0; i<user->nt-1; i++) {
    385:     MatMult(user->JsBlock,user->yi[i],user->yiwork[i]);
    386:     VecAXPY(user->yiwork[i],-1.0,user->yi[i+1]);
    387:   }
    388:   i = user->nt-1;
    389:   MatMult(user->JsBlock,user->yi[i],user->yiwork[i]);
    390:   Gather_i(Y,user->yiwork,user->yi_scatter,user->nt);
    391:   return 0;
    392: }

    394: PetscErrorCode StateMatBlockMult(Mat J_shell, Vec X, Vec Y)
    395: {
    396:   AppCtx         *user;

    398:   MatShellGetContext(J_shell,&user);
    399:   MatMult(user->Grad,X,user->Swork);
    400:   VecPointwiseDivide(user->Swork,user->Swork,user->Av_u);
    401:   MatMult(user->Div,user->Swork,Y);
    402:   VecAYPX(Y,user->ht,X);
    403:   return 0;
    404: }

    406: PetscErrorCode DesignMatMult(Mat J_shell, Vec X, Vec Y)
    407: {
    408:   PetscInt       i;
    409:   AppCtx         *user;

    411:   MatShellGetContext(J_shell,&user);

    413:   /* sdiag(1./v) */
    414:   VecSet(user->uwork,0);
    415:   VecAXPY(user->uwork,-1.0,user->u);
    416:   VecExp(user->uwork);

    418:   /* sdiag(1./((Av*(1./v)).^2)) */
    419:   MatMult(user->Av,user->uwork,user->Swork);
    420:   VecPointwiseMult(user->Swork,user->Swork,user->Swork);
    421:   VecReciprocal(user->Swork);

    423:   /* (Av * (sdiag(1./v) * b)) */
    424:   VecPointwiseMult(user->uwork,user->uwork,X);
    425:   MatMult(user->Av,user->uwork,user->Twork);

    427:   /* (sdiag(1./((Av*(1./v)).^2)) * (Av * (sdiag(1./v) * b))) */
    428:   VecPointwiseMult(user->Swork,user->Twork,user->Swork);

    430:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    431:   for (i=0; i<user->nt; i++) {
    432:     /* (sdiag(Grad*y(:,i)) */
    433:     MatMult(user->Grad,user->yi[i],user->Twork);

    435:     /* ht * Div * (sdiag(Grad*y(:,i)) * (sdiag(1./((Av*(1./v)).^2)) * (Av * (sdiag(1./v) * b)))) */
    436:     VecPointwiseMult(user->Twork,user->Twork,user->Swork);
    437:     MatMult(user->Div,user->Twork,user->yiwork[i]);
    438:     VecScale(user->yiwork[i],user->ht);
    439:   }
    440:   Gather_i(Y,user->yiwork,user->yi_scatter,user->nt);

    442:   return 0;
    443: }

    445: PetscErrorCode DesignMatMultTranspose(Mat J_shell, Vec X, Vec Y)
    446: {
    447:   PetscInt       i;
    448:   AppCtx         *user;

    450:   MatShellGetContext(J_shell,&user);

    452:   /* sdiag(1./((Av*(1./v)).^2)) */
    453:   VecSet(user->uwork,0);
    454:   VecAXPY(user->uwork,-1.0,user->u);
    455:   VecExp(user->uwork);
    456:   MatMult(user->Av,user->uwork,user->Rwork);
    457:   VecPointwiseMult(user->Rwork,user->Rwork,user->Rwork);
    458:   VecReciprocal(user->Rwork);

    460:   VecSet(Y,0.0);
    461:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    462:   Scatter_i(X,user->yiwork,user->yi_scatter,user->nt);
    463:   for (i=0; i<user->nt; i++) {
    464:     /* (Div' * b(:,i)) */
    465:     MatMult(user->Grad,user->yiwork[i],user->Swork);

    467:     /* sdiag(Grad*y(:,i)) */
    468:     MatMult(user->Grad,user->yi[i],user->Twork);

    470:     /* (sdiag(Grad*y(:,i)) * (Div' * b(:,i))) */
    471:     VecPointwiseMult(user->Twork,user->Swork,user->Twork);

    473:     /* (sdiag(1./((Av*(1./v)).^2)) * (sdiag(Grad*y(:,i)) * (Div' * b(:,i)))) */
    474:     VecPointwiseMult(user->Twork,user->Rwork,user->Twork);

    476:     /* (Av' * (sdiag(1./((Av*(1./v)).^2)) * (sdiag(Grad*y(:,i)) * (Div' * b(:,i))))) */
    477:     MatMult(user->AvT,user->Twork,user->yiwork[i]);

    479:     /* sdiag(1./v) * (Av' * (sdiag(1./((Av*(1./v)).^2)) * (sdiag(Grad*y(:,i)) * (Div' * b(:,i))))) */
    480:     VecPointwiseMult(user->yiwork[i],user->uwork,user->yiwork[i]);
    481:     VecAXPY(Y,user->ht,user->yiwork[i]);
    482:   }
    483:   return 0;
    484: }

    486: PetscErrorCode StateMatBlockPrecMult(PC PC_shell, Vec X, Vec Y)
    487: {
    488:   AppCtx         *user;

    490:   PCShellGetContext(PC_shell,&user);

    492:   if (user->dsg_formed) {
    493:     MatSOR(user->DSG,X,1.0,(MatSORType)(SOR_ZERO_INITIAL_GUESS | SOR_LOCAL_SYMMETRIC_SWEEP),0.0,1,1,Y);
    494:   } else SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"DSG not formed");
    495:   return 0;
    496: }

    498: PetscErrorCode StateMatInvMult(Mat J_shell, Vec X, Vec Y)
    499: {
    500:   AppCtx         *user;
    501:   PetscInt       its,i;

    503:   MatShellGetContext(J_shell,&user);

    505:   if (Y == user->ytrue) {
    506:     /* First solve is done with true solution to set up problem */
    507:     KSPSetTolerances(user->solver,1e-8,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT);
    508:   } else {
    509:     KSPSetTolerances(user->solver,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT);
    510:   }

    512:   Scatter_i(X,user->yi,user->yi_scatter,user->nt);
    513:   KSPSolve(user->solver,user->yi[0],user->yiwork[0]);
    514:   KSPGetIterationNumber(user->solver,&its);
    515:   user->ksp_its = user->ksp_its + its;

    517:   for (i=1; i<user->nt; i++) {
    518:     VecAXPY(user->yi[i],1.0,user->yiwork[i-1]);
    519:     KSPSolve(user->solver,user->yi[i],user->yiwork[i]);
    520:     KSPGetIterationNumber(user->solver,&its);
    521:     user->ksp_its = user->ksp_its + its;
    522:   }
    523:   Gather_i(Y,user->yiwork,user->yi_scatter,user->nt);
    524:   return 0;
    525: }

    527: PetscErrorCode StateMatInvTransposeMult(Mat J_shell, Vec X, Vec Y)
    528: {
    529:   AppCtx         *user;
    530:   PetscInt       its,i;

    532:   MatShellGetContext(J_shell,&user);

    534:   Scatter_i(X,user->yi,user->yi_scatter,user->nt);

    536:   i = user->nt - 1;
    537:   KSPSolve(user->solver,user->yi[i],user->yiwork[i]);

    539:   KSPGetIterationNumber(user->solver,&its);
    540:   user->ksp_its = user->ksp_its + its;

    542:   for (i=user->nt-2; i>=0; i--) {
    543:     VecAXPY(user->yi[i],1.0,user->yiwork[i+1]);
    544:     KSPSolve(user->solver,user->yi[i],user->yiwork[i]);

    546:     KSPGetIterationNumber(user->solver,&its);
    547:     user->ksp_its = user->ksp_its + its;

    549:   }

    551:   Gather_i(Y,user->yiwork,user->yi_scatter,user->nt);
    552:   return 0;
    553: }

    555: PetscErrorCode StateMatDuplicate(Mat J_shell, MatDuplicateOption opt, Mat *new_shell)
    556: {
    557:   AppCtx         *user;

    559:   MatShellGetContext(J_shell,&user);

    561:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m,user->m,user,new_shell);
    562:   MatShellSetOperation(*new_shell,MATOP_MULT,(void(*)(void))StateMatMult);
    563:   MatShellSetOperation(*new_shell,MATOP_DUPLICATE,(void(*)(void))StateMatDuplicate);
    564:   MatShellSetOperation(*new_shell,MATOP_MULT_TRANSPOSE,(void(*)(void))StateMatMultTranspose);
    565:   MatShellSetOperation(*new_shell,MATOP_GET_DIAGONAL,(void(*)(void))StateMatGetDiagonal);
    566:   return 0;
    567: }

    569: PetscErrorCode StateMatGetDiagonal(Mat J_shell, Vec X)
    570: {
    571:   AppCtx         *user;

    573:   MatShellGetContext(J_shell,&user);
    574:   VecCopy(user->js_diag,X);
    575:   return 0;

    577: }

    579: PetscErrorCode FormConstraints(Tao tao, Vec X, Vec C, void *ptr)
    580: {
    581:   /* con = Ay - q, A = [B  0  0 ... 0;
    582:                        -I  B  0 ... 0;
    583:                         0 -I  B ... 0;
    584:                              ...     ;
    585:                         0    ... -I B]
    586:      B = ht * Div * Sigma * Grad + eye */
    587:   PetscInt       i;
    588:   AppCtx         *user = (AppCtx*)ptr;

    590:   Scatter(X,user->y,user->state_scatter,user->u,user->design_scatter);
    591:   Scatter_i(user->y,user->yi,user->yi_scatter,user->nt);
    592:   MatMult(user->JsBlock,user->yi[0],user->yiwork[0]);
    593:   for (i=1; i<user->nt; i++) {
    594:     MatMult(user->JsBlock,user->yi[i],user->yiwork[i]);
    595:     VecAXPY(user->yiwork[i],-1.0,user->yi[i-1]);
    596:   }
    597:   Gather_i(C,user->yiwork,user->yi_scatter,user->nt);
    598:   VecAXPY(C,-1.0,user->q);
    599:   return 0;
    600: }

    602: PetscErrorCode Scatter(Vec x, Vec state, VecScatter s_scat, Vec design, VecScatter d_scat)
    603: {
    604:   VecScatterBegin(s_scat,x,state,INSERT_VALUES,SCATTER_FORWARD);
    605:   VecScatterEnd(s_scat,x,state,INSERT_VALUES,SCATTER_FORWARD);
    606:   VecScatterBegin(d_scat,x,design,INSERT_VALUES,SCATTER_FORWARD);
    607:   VecScatterEnd(d_scat,x,design,INSERT_VALUES,SCATTER_FORWARD);
    608:   return 0;
    609: }

    611: PetscErrorCode Scatter_i(Vec y, Vec *yi, VecScatter *scat, PetscInt nt)
    612: {
    613:   PetscInt       i;

    615:   for (i=0; i<nt; i++) {
    616:     VecScatterBegin(scat[i],y,yi[i],INSERT_VALUES,SCATTER_FORWARD);
    617:     VecScatterEnd(scat[i],y,yi[i],INSERT_VALUES,SCATTER_FORWARD);
    618:   }
    619:   return 0;
    620: }

    622: PetscErrorCode Gather(Vec x, Vec state, VecScatter s_scat, Vec design, VecScatter d_scat)
    623: {
    624:   VecScatterBegin(s_scat,state,x,INSERT_VALUES,SCATTER_REVERSE);
    625:   VecScatterEnd(s_scat,state,x,INSERT_VALUES,SCATTER_REVERSE);
    626:   VecScatterBegin(d_scat,design,x,INSERT_VALUES,SCATTER_REVERSE);
    627:   VecScatterEnd(d_scat,design,x,INSERT_VALUES,SCATTER_REVERSE);
    628:   return 0;
    629: }

    631: PetscErrorCode Gather_i(Vec y, Vec *yi, VecScatter *scat, PetscInt nt)
    632: {
    633:   PetscInt       i;

    635:   for (i=0; i<nt; i++) {
    636:     VecScatterBegin(scat[i],yi[i],y,INSERT_VALUES,SCATTER_REVERSE);
    637:     VecScatterEnd(scat[i],yi[i],y,INSERT_VALUES,SCATTER_REVERSE);
    638:   }
    639:   return 0;
    640: }

    642: PetscErrorCode ParabolicInitialize(AppCtx *user)
    643: {
    644:   PetscInt       m,n,i,j,k,linear_index,istart,iend,iblock,lo,hi,lo2,hi2;
    645:   Vec            XX,YY,ZZ,XXwork,YYwork,ZZwork,UTwork,yi,di,bc;
    646:   PetscReal      *x, *y, *z;
    647:   PetscReal      h,stime;
    648:   PetscScalar    hinv,neg_hinv,half = 0.5,sqrt_beta;
    649:   PetscInt       im,indx1,indx2,indy1,indy2,indz1,indz2,nx,ny,nz;
    650:   PetscReal      xri,yri,zri,xim,yim,zim,dx1,dx2,dy1,dy2,dz1,dz2,Dx,Dy,Dz;
    651:   PetscScalar    v,vx,vy,vz;
    652:   IS             is_from_y,is_to_yi,is_from_d,is_to_di;
    653:   /* Data locations */
    654:   PetscScalar xr[64] = {0.4970,     0.8498,     0.7814,     0.6268,     0.7782,     0.6402,     0.3617,     0.3160,
    655:                         0.3610,     0.5298,     0.6987,     0.3331,     0.7962,     0.5596,     0.3866,     0.6774,
    656:                         0.5407,     0.4518,     0.6702,     0.6061,     0.7580,     0.8997,     0.5198,     0.8326,
    657:                         0.2138,     0.9198,     0.3000,     0.2833,     0.8288,     0.7076,     0.1820,     0.0728,
    658:                         0.8447,     0.2367,     0.3239,     0.6413,     0.3114,     0.4731,     0.1192,     0.9273,
    659:                         0.5724,     0.4331,     0.5136,     0.3547,     0.4413,     0.2602,     0.5698,     0.7278,
    660:                         0.5261,     0.6230,     0.2454,     0.3948,     0.7479,     0.6582,     0.4660,     0.5594,
    661:                         0.7574,     0.1143,     0.5900,     0.1065,     0.4260,     0.3294,     0.8276,     0.0756};

    663:   PetscScalar yr[64] = {0.7345,     0.9120,     0.9288,     0.7528,     0.4463,     0.4985,     0.2497,     0.6256,
    664:                         0.3425,     0.9026,     0.6983,     0.4230,     0.7140,     0.2970,     0.4474,     0.8792,
    665:                         0.6604,     0.2485,     0.7968,     0.6127,     0.1796,     0.2437,     0.5938,     0.6137,
    666:                         0.3867,     0.5658,     0.4575,     0.1009,     0.0863,     0.3361,     0.0738,     0.3985,
    667:                         0.6602,     0.1437,     0.0934,     0.5983,     0.5950,     0.0763,     0.0768,     0.2288,
    668:                         0.5761,     0.1129,     0.3841,     0.6150,     0.6904,     0.6686,     0.1361,     0.4601,
    669:                         0.4491,     0.3716,     0.1969,     0.6537,     0.6743,     0.6991,     0.4811,     0.5480,
    670:                         0.1684,     0.4569,     0.6889,     0.8437,     0.3015,     0.2854,     0.8199,     0.2658};

    672:   PetscScalar zr[64] = {0.7668,     0.8573,     0.2654,     0.2719,     0.1060,     0.1311,     0.6232,     0.2295,
    673:                         0.8009,     0.2147,     0.2119,     0.9325,     0.4473,     0.3600,     0.3374,     0.3819,
    674:                         0.4066,     0.5801,     0.1673,     0.0959,     0.4638,     0.8236,     0.8800,     0.2939,
    675:                         0.2028,     0.8262,     0.2706,     0.6276,     0.9085,     0.6443,     0.8241,     0.0712,
    676:                         0.1824,     0.7789,     0.4389,     0.8415,     0.7055,     0.6639,     0.3653,     0.2078,
    677:                         0.1987,     0.2297,     0.4321,     0.8115,     0.4915,     0.7764,     0.4657,     0.4627,
    678:                         0.4569,     0.4232,     0.8514,     0.0674,     0.3227,     0.1055,     0.6690,     0.6313,
    679:                         0.9226,     0.5461,     0.4126,     0.2364,     0.6096,     0.7042,     0.3914,     0.0711};

    681:   PetscMalloc1(user->mx,&x);
    682:   PetscMalloc1(user->mx,&y);
    683:   PetscMalloc1(user->mx,&z);
    684:   user->jformed = PETSC_FALSE;
    685:   user->dsg_formed = PETSC_FALSE;

    687:   n = user->mx * user->mx * user->mx;
    688:   m = 3 * user->mx * user->mx * (user->mx-1);
    689:   sqrt_beta = PetscSqrtScalar(user->beta);

    691:   user->ksp_its = 0;
    692:   user->ksp_its_initial = 0;

    694:   stime = (PetscReal)user->nt/user->ns;
    695:   PetscMalloc1(user->ns,&user->sample_times);
    696:   for (i=0; i<user->ns; i++) {
    697:     user->sample_times[i] = (PetscInt)(stime*((PetscReal)i+1.0)-0.5);
    698:   }

    700:   VecCreate(PETSC_COMM_WORLD,&XX);
    701:   VecCreate(PETSC_COMM_WORLD,&user->q);
    702:   VecSetSizes(XX,PETSC_DECIDE,n);
    703:   VecSetSizes(user->q,PETSC_DECIDE,n*user->nt);
    704:   VecSetFromOptions(XX);
    705:   VecSetFromOptions(user->q);

    707:   VecDuplicate(XX,&YY);
    708:   VecDuplicate(XX,&ZZ);
    709:   VecDuplicate(XX,&XXwork);
    710:   VecDuplicate(XX,&YYwork);
    711:   VecDuplicate(XX,&ZZwork);
    712:   VecDuplicate(XX,&UTwork);
    713:   VecDuplicate(XX,&user->utrue);
    714:   VecDuplicate(XX,&bc);

    716:   /* Generate 3D grid, and collect ns (1<=ns<=8) right-hand-side vectors into user->q */
    717:   h = 1.0/user->mx;
    718:   hinv = user->mx;
    719:   neg_hinv = -hinv;

    721:   VecGetOwnershipRange(XX,&istart,&iend);
    722:   for (linear_index=istart; linear_index<iend; linear_index++) {
    723:     i = linear_index % user->mx;
    724:     j = ((linear_index-i)/user->mx) % user->mx;
    725:     k = ((linear_index-i)/user->mx-j) / user->mx;
    726:     vx = h*(i+0.5);
    727:     vy = h*(j+0.5);
    728:     vz = h*(k+0.5);
    729:     VecSetValues(XX,1,&linear_index,&vx,INSERT_VALUES);
    730:     VecSetValues(YY,1,&linear_index,&vy,INSERT_VALUES);
    731:     VecSetValues(ZZ,1,&linear_index,&vz,INSERT_VALUES);
    732:     if ((vx<0.6) && (vx>0.4) && (vy<0.6) && (vy>0.4) && (vy<0.6) && (vz<0.6) && (vz>0.4)) {
    733:       v = 1000.0;
    734:       VecSetValues(bc,1,&linear_index,&v,INSERT_VALUES);
    735:     }
    736:   }

    738:   VecAssemblyBegin(XX);
    739:   VecAssemblyEnd(XX);
    740:   VecAssemblyBegin(YY);
    741:   VecAssemblyEnd(YY);
    742:   VecAssemblyBegin(ZZ);
    743:   VecAssemblyEnd(ZZ);
    744:   VecAssemblyBegin(bc);
    745:   VecAssemblyEnd(bc);

    747:   /* Compute true parameter function
    748:      ut = 0.5 + exp(-10*((x-0.5)^2+(y-0.5)^2+(z-0.5)^2)) */
    749:   VecCopy(XX,XXwork);
    750:   VecCopy(YY,YYwork);
    751:   VecCopy(ZZ,ZZwork);

    753:   VecShift(XXwork,-0.5);
    754:   VecShift(YYwork,-0.5);
    755:   VecShift(ZZwork,-0.5);

    757:   VecPointwiseMult(XXwork,XXwork,XXwork);
    758:   VecPointwiseMult(YYwork,YYwork,YYwork);
    759:   VecPointwiseMult(ZZwork,ZZwork,ZZwork);

    761:   VecCopy(XXwork,user->utrue);
    762:   VecAXPY(user->utrue,1.0,YYwork);
    763:   VecAXPY(user->utrue,1.0,ZZwork);
    764:   VecScale(user->utrue,-10.0);
    765:   VecExp(user->utrue);
    766:   VecShift(user->utrue,0.5);

    768:   VecDestroy(&XX);
    769:   VecDestroy(&YY);
    770:   VecDestroy(&ZZ);
    771:   VecDestroy(&XXwork);
    772:   VecDestroy(&YYwork);
    773:   VecDestroy(&ZZwork);
    774:   VecDestroy(&UTwork);

    776:   /* Initial guess and reference model */
    777:   VecDuplicate(user->utrue,&user->ur);
    778:   VecSet(user->ur,0.0);

    780:   /* Generate Grad matrix */
    781:   MatCreate(PETSC_COMM_WORLD,&user->Grad);
    782:   MatSetSizes(user->Grad,PETSC_DECIDE,PETSC_DECIDE,m,n);
    783:   MatSetFromOptions(user->Grad);
    784:   MatMPIAIJSetPreallocation(user->Grad,2,NULL,2,NULL);
    785:   MatSeqAIJSetPreallocation(user->Grad,2,NULL);
    786:   MatGetOwnershipRange(user->Grad,&istart,&iend);

    788:   for (i=istart; i<iend; i++) {
    789:     if (i<m/3) {
    790:       iblock = i / (user->mx-1);
    791:       j = iblock*user->mx + (i % (user->mx-1));
    792:       MatSetValues(user->Grad,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    793:       j = j+1;
    794:       MatSetValues(user->Grad,1,&i,1,&j,&hinv,INSERT_VALUES);
    795:     }
    796:     if (i>=m/3 && i<2*m/3) {
    797:       iblock = (i-m/3) / (user->mx*(user->mx-1));
    798:       j = iblock*user->mx*user->mx + ((i-m/3) % (user->mx*(user->mx-1)));
    799:       MatSetValues(user->Grad,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    800:       j = j + user->mx;
    801:       MatSetValues(user->Grad,1,&i,1,&j,&hinv,INSERT_VALUES);
    802:     }
    803:     if (i>=2*m/3) {
    804:       j = i-2*m/3;
    805:       MatSetValues(user->Grad,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    806:       j = j + user->mx*user->mx;
    807:       MatSetValues(user->Grad,1,&i,1,&j,&hinv,INSERT_VALUES);
    808:     }
    809:   }

    811:   MatAssemblyBegin(user->Grad,MAT_FINAL_ASSEMBLY);
    812:   MatAssemblyEnd(user->Grad,MAT_FINAL_ASSEMBLY);

    814:   /* Generate arithmetic averaging matrix Av */
    815:   MatCreate(PETSC_COMM_WORLD,&user->Av);
    816:   MatSetSizes(user->Av,PETSC_DECIDE,PETSC_DECIDE,m,n);
    817:   MatSetFromOptions(user->Av);
    818:   MatMPIAIJSetPreallocation(user->Av,2,NULL,2,NULL);
    819:   MatSeqAIJSetPreallocation(user->Av,2,NULL);
    820:   MatGetOwnershipRange(user->Av,&istart,&iend);

    822:   for (i=istart; i<iend; i++) {
    823:     if (i<m/3) {
    824:       iblock = i / (user->mx-1);
    825:       j = iblock*user->mx + (i % (user->mx-1));
    826:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    827:       j = j+1;
    828:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    829:     }
    830:     if (i>=m/3 && i<2*m/3) {
    831:       iblock = (i-m/3) / (user->mx*(user->mx-1));
    832:       j = iblock*user->mx*user->mx + ((i-m/3) % (user->mx*(user->mx-1)));
    833:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    834:       j = j + user->mx;
    835:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    836:     }
    837:     if (i>=2*m/3) {
    838:       j = i-2*m/3;
    839:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    840:       j = j + user->mx*user->mx;
    841:       MatSetValues(user->Av,1,&i,1,&j,&half,INSERT_VALUES);
    842:     }
    843:   }

    845:   MatAssemblyBegin(user->Av,MAT_FINAL_ASSEMBLY);
    846:   MatAssemblyEnd(user->Av,MAT_FINAL_ASSEMBLY);

    848:   /* Generate transpose of averaging matrix Av */
    849:   MatTranspose(user->Av,MAT_INITIAL_MATRIX,&user->AvT);

    851:   MatCreate(PETSC_COMM_WORLD,&user->L);
    852:   MatSetSizes(user->L,PETSC_DECIDE,PETSC_DECIDE,m+n,n);
    853:   MatSetFromOptions(user->L);
    854:   MatMPIAIJSetPreallocation(user->L,2,NULL,2,NULL);
    855:   MatSeqAIJSetPreallocation(user->L,2,NULL);
    856:   MatGetOwnershipRange(user->L,&istart,&iend);

    858:   for (i=istart; i<iend; i++) {
    859:     if (i<m/3) {
    860:       iblock = i / (user->mx-1);
    861:       j = iblock*user->mx + (i % (user->mx-1));
    862:       MatSetValues(user->L,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    863:       j = j+1;
    864:       MatSetValues(user->L,1,&i,1,&j,&hinv,INSERT_VALUES);
    865:     }
    866:     if (i>=m/3 && i<2*m/3) {
    867:       iblock = (i-m/3) / (user->mx*(user->mx-1));
    868:       j = iblock*user->mx*user->mx + ((i-m/3) % (user->mx*(user->mx-1)));
    869:       MatSetValues(user->L,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    870:       j = j + user->mx;
    871:       MatSetValues(user->L,1,&i,1,&j,&hinv,INSERT_VALUES);
    872:     }
    873:     if (i>=2*m/3 && i<m) {
    874:       j = i-2*m/3;
    875:       MatSetValues(user->L,1,&i,1,&j,&neg_hinv,INSERT_VALUES);
    876:       j = j + user->mx*user->mx;
    877:       MatSetValues(user->L,1,&i,1,&j,&hinv,INSERT_VALUES);
    878:     }
    879:     if (i>=m) {
    880:       j = i - m;
    881:       MatSetValues(user->L,1,&i,1,&j,&sqrt_beta,INSERT_VALUES);
    882:     }
    883:   }

    885:   MatAssemblyBegin(user->L,MAT_FINAL_ASSEMBLY);
    886:   MatAssemblyEnd(user->L,MAT_FINAL_ASSEMBLY);

    888:   MatScale(user->L,PetscPowScalar(h,1.5));

    890:   /* Generate Div matrix */
    891:   MatTranspose(user->Grad,MAT_INITIAL_MATRIX,&user->Div);

    893:   /* Build work vectors and matrices */
    894:   VecCreate(PETSC_COMM_WORLD,&user->S);
    895:   VecSetSizes(user->S, PETSC_DECIDE, user->mx*user->mx*(user->mx-1)*3);
    896:   VecSetFromOptions(user->S);

    898:   VecCreate(PETSC_COMM_WORLD,&user->lwork);
    899:   VecSetSizes(user->lwork,PETSC_DECIDE,m+user->mx*user->mx*user->mx);
    900:   VecSetFromOptions(user->lwork);

    902:   MatDuplicate(user->Div,MAT_SHARE_NONZERO_PATTERN,&user->Divwork);
    903:   MatDuplicate(user->Av,MAT_SHARE_NONZERO_PATTERN,&user->Avwork);

    905:   VecCreate(PETSC_COMM_WORLD,&user->d);
    906:   VecSetSizes(user->d,PETSC_DECIDE,user->ndata*user->nt);
    907:   VecSetFromOptions(user->d);

    909:   VecDuplicate(user->S,&user->Swork);
    910:   VecDuplicate(user->S,&user->Av_u);
    911:   VecDuplicate(user->S,&user->Twork);
    912:   VecDuplicate(user->S,&user->Rwork);
    913:   VecDuplicate(user->y,&user->ywork);
    914:   VecDuplicate(user->u,&user->uwork);
    915:   VecDuplicate(user->u,&user->js_diag);
    916:   VecDuplicate(user->c,&user->cwork);
    917:   VecDuplicate(user->d,&user->dwork);

    919:   /* Create matrix-free shell user->Js for computing A*x */
    920:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m*user->nt,user->m*user->nt,user,&user->Js);
    921:   MatShellSetOperation(user->Js,MATOP_MULT,(void(*)(void))StateMatMult);
    922:   MatShellSetOperation(user->Js,MATOP_DUPLICATE,(void(*)(void))StateMatDuplicate);
    923:   MatShellSetOperation(user->Js,MATOP_MULT_TRANSPOSE,(void(*)(void))StateMatMultTranspose);
    924:   MatShellSetOperation(user->Js,MATOP_GET_DIAGONAL,(void(*)(void))StateMatGetDiagonal);

    926:   /* Diagonal blocks of user->Js */
    927:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m,user->m,user,&user->JsBlock);
    928:   MatShellSetOperation(user->JsBlock,MATOP_MULT,(void(*)(void))StateMatBlockMult);
    929:   /* Blocks are symmetric */
    930:   MatShellSetOperation(user->JsBlock,MATOP_MULT_TRANSPOSE,(void(*)(void))StateMatBlockMult);

    932:   /* Create a matrix-free shell user->JsBlockPrec for computing (U+D)\D*(L+D)\x, where JsBlock = L+D+U,
    933:      D is diagonal, L is strictly lower triangular, and U is strictly upper triangular.
    934:      This is an SSOR preconditioner for user->JsBlock. */
    935:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m,user->m,user,&user->JsBlockPrec);
    936:   MatShellSetOperation(user->JsBlockPrec,MATOP_MULT,(void(*)(void))StateMatBlockPrecMult);
    937:   /* JsBlockPrec is symmetric */
    938:   MatShellSetOperation(user->JsBlockPrec,MATOP_MULT_TRANSPOSE,(void(*)(void))StateMatBlockPrecMult);
    939:   MatSetOption(user->JsBlockPrec,MAT_SYMMETRY_ETERNAL,PETSC_TRUE);

    941:   /* Create a matrix-free shell user->Jd for computing B*x */
    942:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m*user->nt,user->m,user,&user->Jd);
    943:   MatShellSetOperation(user->Jd,MATOP_MULT,(void(*)(void))DesignMatMult);
    944:   MatShellSetOperation(user->Jd,MATOP_MULT_TRANSPOSE,(void(*)(void))DesignMatMultTranspose);

    946:   /* User-defined routines for computing user->Js\x and user->Js^T\x*/
    947:   MatCreateShell(PETSC_COMM_WORLD,PETSC_DETERMINE,PETSC_DETERMINE,user->m*user->nt,user->m*user->nt,user,&user->JsInv);
    948:   MatShellSetOperation(user->JsInv,MATOP_MULT,(void(*)(void))StateMatInvMult);
    949:   MatShellSetOperation(user->JsInv,MATOP_MULT_TRANSPOSE,(void(*)(void))StateMatInvTransposeMult);

    951:   /* Solver options and tolerances */
    952:   KSPCreate(PETSC_COMM_WORLD,&user->solver);
    953:   KSPSetType(user->solver,KSPCG);
    954:   KSPSetOperators(user->solver,user->JsBlock,user->JsBlockPrec);
    955:   KSPSetInitialGuessNonzero(user->solver,PETSC_FALSE);
    956:   KSPSetTolerances(user->solver,1e-4,1e-20,1e3,500);
    957:   KSPSetFromOptions(user->solver);
    958:   KSPGetPC(user->solver,&user->prec);
    959:   PCSetType(user->prec,PCSHELL);

    961:   PCShellSetApply(user->prec,StateMatBlockPrecMult);
    962:   PCShellSetApplyTranspose(user->prec,StateMatBlockPrecMult);
    963:   PCShellSetContext(user->prec,user);

    965:   /* Create scatter from y to y_1,y_2,...,y_nt */
    966:   PetscMalloc1(user->nt*user->m,&user->yi_scatter);
    967:   VecCreate(PETSC_COMM_WORLD,&yi);
    968:   VecSetSizes(yi,PETSC_DECIDE,user->mx*user->mx*user->mx);
    969:   VecSetFromOptions(yi);
    970:   VecDuplicateVecs(yi,user->nt,&user->yi);
    971:   VecDuplicateVecs(yi,user->nt,&user->yiwork);

    973:   VecGetOwnershipRange(user->y,&lo2,&hi2);
    974:   istart = 0;
    975:   for (i=0; i<user->nt; i++) {
    976:     VecGetOwnershipRange(user->yi[i],&lo,&hi);
    977:     ISCreateStride(PETSC_COMM_SELF,hi-lo,lo,1,&is_to_yi);
    978:     ISCreateStride(PETSC_COMM_SELF,hi-lo,lo2+istart,1,&is_from_y);
    979:     VecScatterCreate(user->y,is_from_y,user->yi[i],is_to_yi,&user->yi_scatter[i]);
    980:     istart = istart + hi-lo;
    981:     ISDestroy(&is_to_yi);
    982:     ISDestroy(&is_from_y);
    983:   }
    984:   VecDestroy(&yi);

    986:   /* Create scatter from d to d_1,d_2,...,d_ns */
    987:   PetscMalloc1(user->ns*user->ndata,&user->di_scatter);
    988:   VecCreate(PETSC_COMM_WORLD,&di);
    989:   VecSetSizes(di,PETSC_DECIDE,user->ndata);
    990:   VecSetFromOptions(di);
    991:   VecDuplicateVecs(di,user->ns,&user->di);
    992:   VecGetOwnershipRange(user->d,&lo2,&hi2);
    993:   istart = 0;
    994:   for (i=0; i<user->ns; i++) {
    995:     VecGetOwnershipRange(user->di[i],&lo,&hi);
    996:     ISCreateStride(PETSC_COMM_SELF,hi-lo,lo,1,&is_to_di);
    997:     ISCreateStride(PETSC_COMM_SELF,hi-lo,lo2+istart,1,&is_from_d);
    998:     VecScatterCreate(user->d,is_from_d,user->di[i],is_to_di,&user->di_scatter[i]);
    999:     istart = istart + hi-lo;
    1000:     ISDestroy(&is_to_di);
    1001:     ISDestroy(&is_from_d);
    1002:   }
    1003:   VecDestroy(&di);

    1005:   /* Assemble RHS of forward problem */
    1006:   VecCopy(bc,user->yiwork[0]);
    1007:   for (i=1; i<user->nt; i++) {
    1008:     VecSet(user->yiwork[i],0.0);
    1009:   }
    1010:   Gather_i(user->q,user->yiwork,user->yi_scatter,user->nt);
    1011:   VecDestroy(&bc);

    1013:   /* Compute true state function yt given ut */
    1014:   VecCreate(PETSC_COMM_WORLD,&user->ytrue);
    1015:   VecSetSizes(user->ytrue,PETSC_DECIDE,n*user->nt);
    1016:   VecSetFromOptions(user->ytrue);

    1018:   /* First compute Av_u = Av*exp(-u) */
    1019:   VecSet(user->uwork,0);
    1020:   VecAXPY(user->uwork,-1.0,user->utrue); /*  Note: user->utrue */
    1021:   VecExp(user->uwork);
    1022:   MatMult(user->Av,user->uwork,user->Av_u);

    1024:   /* Symbolic DSG = Div * Grad */
    1025:   MatProductCreate(user->Div,user->Grad,NULL,&user->DSG);
    1026:   MatProductSetType(user->DSG,MATPRODUCT_AB);
    1027:   MatProductSetAlgorithm(user->DSG,"default");
    1028:   MatProductSetFill(user->DSG,PETSC_DEFAULT);
    1029:   MatProductSetFromOptions(user->DSG);
    1030:   MatProductSymbolic(user->DSG);

    1032:   user->dsg_formed = PETSC_TRUE;

    1034:   /* Next form DSG = Div*Grad */
    1035:   MatCopy(user->Div,user->Divwork,SAME_NONZERO_PATTERN);
    1036:   MatDiagonalScale(user->Divwork,NULL,user->Av_u);
    1037:   if (user->dsg_formed) {
    1038:     MatProductNumeric(user->DSG);
    1039:   } else {
    1040:     MatMatMult(user->Div,user->Grad,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&user->DSG);
    1041:     user->dsg_formed = PETSC_TRUE;
    1042:   }
    1043:   /* B = speye(nx^3) + ht*DSG; */
    1044:   MatScale(user->DSG,user->ht);
    1045:   MatShift(user->DSG,1.0);

    1047:   /* Now solve for ytrue */
    1048:   StateMatInvMult(user->Js,user->q,user->ytrue);

    1050:   /* Initial guess y0 for state given u0 */

    1052:   /* First compute Av_u = Av*exp(-u) */
    1053:   VecSet(user->uwork,0);
    1054:   VecAXPY(user->uwork,-1.0,user->u); /*  Note: user->u */
    1055:   VecExp(user->uwork);
    1056:   MatMult(user->Av,user->uwork,user->Av_u);

    1058:   /* Next form DSG = Div*S*Grad */
    1059:   MatCopy(user->Div,user->Divwork,SAME_NONZERO_PATTERN);
    1060:   MatDiagonalScale(user->Divwork,NULL,user->Av_u);
    1061:   if (user->dsg_formed) {
    1062:     MatProductNumeric(user->DSG);
    1063:   } else {
    1064:     MatMatMult(user->Div,user->Grad,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&user->DSG);

    1066:     user->dsg_formed = PETSC_TRUE;
    1067:   }
    1068:   /* B = speye(nx^3) + ht*DSG; */
    1069:   MatScale(user->DSG,user->ht);
    1070:   MatShift(user->DSG,1.0);

    1072:   /* Now solve for y */
    1073:   StateMatInvMult(user->Js,user->q,user->y);

    1075:   /* Construct projection matrix Q, a block diagonal matrix consisting of nt copies of Qblock along the diagonal */
    1076:   MatCreate(PETSC_COMM_WORLD,&user->Qblock);
    1077:   MatSetSizes(user->Qblock,PETSC_DECIDE,PETSC_DECIDE,user->ndata,n);
    1078:   MatSetFromOptions(user->Qblock);
    1079:   MatMPIAIJSetPreallocation(user->Qblock,8,NULL,8,NULL);
    1080:   MatSeqAIJSetPreallocation(user->Qblock,8,NULL);

    1082:   for (i=0; i<user->mx; i++) {
    1083:     x[i] = h*(i+0.5);
    1084:     y[i] = h*(i+0.5);
    1085:     z[i] = h*(i+0.5);
    1086:   }

    1088:   MatGetOwnershipRange(user->Qblock,&istart,&iend);
    1089:   nx = user->mx; ny = user->mx; nz = user->mx;
    1090:   for (i=istart; i<iend; i++) {
    1091:     xri = xr[i];
    1092:     im = 0;
    1093:     xim = x[im];
    1094:     while (xri>xim && im<nx) {
    1095:       im = im+1;
    1096:       xim = x[im];
    1097:     }
    1098:     indx1 = im-1;
    1099:     indx2 = im;
    1100:     dx1 = xri - x[indx1];
    1101:     dx2 = x[indx2] - xri;

    1103:     yri = yr[i];
    1104:     im = 0;
    1105:     yim = y[im];
    1106:     while (yri>yim && im<ny) {
    1107:       im = im+1;
    1108:       yim = y[im];
    1109:     }
    1110:     indy1 = im-1;
    1111:     indy2 = im;
    1112:     dy1 = yri - y[indy1];
    1113:     dy2 = y[indy2] - yri;

    1115:     zri = zr[i];
    1116:     im = 0;
    1117:     zim = z[im];
    1118:     while (zri>zim && im<nz) {
    1119:       im = im+1;
    1120:       zim = z[im];
    1121:     }
    1122:     indz1 = im-1;
    1123:     indz2 = im;
    1124:     dz1 = zri - z[indz1];
    1125:     dz2 = z[indz2] - zri;

    1127:     Dx = x[indx2] - x[indx1];
    1128:     Dy = y[indy2] - y[indy1];
    1129:     Dz = z[indz2] - z[indz1];

    1131:     j = indx1 + indy1*nx + indz1*nx*ny;
    1132:     v = (1-dx1/Dx)*(1-dy1/Dy)*(1-dz1/Dz);
    1133:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1135:     j = indx1 + indy1*nx + indz2*nx*ny;
    1136:     v = (1-dx1/Dx)*(1-dy1/Dy)*(1-dz2/Dz);
    1137:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1139:     j = indx1 + indy2*nx + indz1*nx*ny;
    1140:     v = (1-dx1/Dx)*(1-dy2/Dy)*(1-dz1/Dz);
    1141:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1143:     j = indx1 + indy2*nx + indz2*nx*ny;
    1144:     v = (1-dx1/Dx)*(1-dy2/Dy)*(1-dz2/Dz);
    1145:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1147:     j = indx2 + indy1*nx + indz1*nx*ny;
    1148:     v = (1-dx2/Dx)*(1-dy1/Dy)*(1-dz1/Dz);
    1149:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1151:     j = indx2 + indy1*nx + indz2*nx*ny;
    1152:     v = (1-dx2/Dx)*(1-dy1/Dy)*(1-dz2/Dz);
    1153:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1155:     j = indx2 + indy2*nx + indz1*nx*ny;
    1156:     v = (1-dx2/Dx)*(1-dy2/Dy)*(1-dz1/Dz);
    1157:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);

    1159:     j = indx2 + indy2*nx + indz2*nx*ny;
    1160:     v = (1-dx2/Dx)*(1-dy2/Dy)*(1-dz2/Dz);
    1161:     MatSetValues(user->Qblock,1,&i,1,&j,&v,INSERT_VALUES);
    1162:   }
    1163:   MatAssemblyBegin(user->Qblock,MAT_FINAL_ASSEMBLY);
    1164:   MatAssemblyEnd(user->Qblock,MAT_FINAL_ASSEMBLY);

    1166:   MatTranspose(user->Qblock,MAT_INITIAL_MATRIX,&user->QblockT);
    1167:   MatTranspose(user->L,MAT_INITIAL_MATRIX,&user->LT);

    1169:   /* Add noise to the measurement data */
    1170:   VecSet(user->ywork,1.0);
    1171:   VecAYPX(user->ywork,user->noise,user->ytrue);
    1172:   Scatter_i(user->ywork,user->yiwork,user->yi_scatter,user->nt);
    1173:   for (j=0; j<user->ns; j++) {
    1174:     i = user->sample_times[j];
    1175:     MatMult(user->Qblock,user->yiwork[i],user->di[j]);
    1176:   }
    1177:   Gather_i(user->d,user->di,user->di_scatter,user->ns);

    1179:   /* Now that initial conditions have been set, let the user pass tolerance options to the KSP solver */
    1180:   KSPSetFromOptions(user->solver);
    1181:   PetscFree(x);
    1182:   PetscFree(y);
    1183:   PetscFree(z);
    1184:   return 0;
    1185: }

    1187: PetscErrorCode ParabolicDestroy(AppCtx *user)
    1188: {
    1189:   PetscInt       i;

    1191:   MatDestroy(&user->Qblock);
    1192:   MatDestroy(&user->QblockT);
    1193:   MatDestroy(&user->Div);
    1194:   MatDestroy(&user->Divwork);
    1195:   MatDestroy(&user->Grad);
    1196:   MatDestroy(&user->Av);
    1197:   MatDestroy(&user->Avwork);
    1198:   MatDestroy(&user->AvT);
    1199:   MatDestroy(&user->DSG);
    1200:   MatDestroy(&user->L);
    1201:   MatDestroy(&user->LT);
    1202:   KSPDestroy(&user->solver);
    1203:   MatDestroy(&user->Js);
    1204:   MatDestroy(&user->Jd);
    1205:   MatDestroy(&user->JsInv);
    1206:   MatDestroy(&user->JsBlock);
    1207:   MatDestroy(&user->JsBlockPrec);
    1208:   VecDestroy(&user->u);
    1209:   VecDestroy(&user->uwork);
    1210:   VecDestroy(&user->utrue);
    1211:   VecDestroy(&user->y);
    1212:   VecDestroy(&user->ywork);
    1213:   VecDestroy(&user->ytrue);
    1214:   VecDestroyVecs(user->nt,&user->yi);
    1215:   VecDestroyVecs(user->nt,&user->yiwork);
    1216:   VecDestroyVecs(user->ns,&user->di);
    1217:   PetscFree(user->yi);
    1218:   PetscFree(user->yiwork);
    1219:   PetscFree(user->di);
    1220:   VecDestroy(&user->c);
    1221:   VecDestroy(&user->cwork);
    1222:   VecDestroy(&user->ur);
    1223:   VecDestroy(&user->q);
    1224:   VecDestroy(&user->d);
    1225:   VecDestroy(&user->dwork);
    1226:   VecDestroy(&user->lwork);
    1227:   VecDestroy(&user->S);
    1228:   VecDestroy(&user->Swork);
    1229:   VecDestroy(&user->Av_u);
    1230:   VecDestroy(&user->Twork);
    1231:   VecDestroy(&user->Rwork);
    1232:   VecDestroy(&user->js_diag);
    1233:   ISDestroy(&user->s_is);
    1234:   ISDestroy(&user->d_is);
    1235:   VecScatterDestroy(&user->state_scatter);
    1236:   VecScatterDestroy(&user->design_scatter);
    1237:   for (i=0; i<user->nt; i++) {
    1238:     VecScatterDestroy(&user->yi_scatter[i]);
    1239:   }
    1240:   for (i=0; i<user->ns; i++) {
    1241:     VecScatterDestroy(&user->di_scatter[i]);
    1242:   }
    1243:   PetscFree(user->yi_scatter);
    1244:   PetscFree(user->di_scatter);
    1245:   PetscFree(user->sample_times);
    1246:   return 0;
    1247: }

    1249: PetscErrorCode ParabolicMonitor(Tao tao, void *ptr)
    1250: {
    1251:   Vec            X;
    1252:   PetscReal      unorm,ynorm;
    1253:   AppCtx         *user = (AppCtx*)ptr;

    1255:   TaoGetSolution(tao,&X);
    1256:   Scatter(X,user->ywork,user->state_scatter,user->uwork,user->design_scatter);
    1257:   VecAXPY(user->ywork,-1.0,user->ytrue);
    1258:   VecAXPY(user->uwork,-1.0,user->utrue);
    1259:   VecNorm(user->uwork,NORM_2,&unorm);
    1260:   VecNorm(user->ywork,NORM_2,&ynorm);
    1261:   PetscPrintf(MPI_COMM_WORLD, "||u-ut||=%g ||y-yt||=%g\n",(double)unorm,(double)ynorm);
    1262:   return 0;
    1263: }

    1265: /*TEST

    1267:    build:
    1268:       requires: !complex

    1270:    test:
    1271:       args: -tao_cmonitor -tao_type lcl -ns 1 -tao_gatol 1.e-4 -ksp_max_it 30
    1272:       requires: !single

    1274: TEST*/