Date: 2022-03-31T04:46:21+00:00

Actual source code: cdf.c

      2: #include <petsc/private/vecimpl.h>
      3: #include "../src/vec/vec/utils/tagger/impls/simple.h"

      5: const char *const VecTaggerCDFMethods[VECTAGGER_CDF_NUM_METHODS] = {"gather","iterative"};

      7: #if !defined (PETSC_USE_COMPLEX)
      8: typedef VecTaggerBox VecTaggerBoxReal;
      9: #else
     10: typedef struct {
     11:   PetscReal min;
     12:   PetscReal max;
     13: } VecTaggerBoxReal;
     14: #endif

     16: typedef struct {
     17:   VecTagger_Simple   smpl;
     18:   PetscReal          atol;
     19:   PetscReal          rtol;
     20:   PetscInt           maxit;
     21:   PetscInt           numMoments;
     22:   VecTaggerCDFMethod method;
     23: } VecTagger_CDF;

     25: static PetscErrorCode VecTaggerComputeBox_CDF_SortedArray(const PetscReal *cArray, PetscInt m, const VecTaggerBoxReal *bxs, VecTaggerBoxReal *boxes)
     26: {
     27:   PetscInt    minInd, maxInd;
     28:   PetscReal   minCDF, maxCDF;

     30:   minCDF = PetscMax(0., bxs->min);
     31:   maxCDF = PetscMin(1., bxs->max);
     32:   minInd = (PetscInt) (minCDF * m);
     33:   maxInd = (PetscInt) (maxCDF * m);
     34:   boxes->min = cArray[PetscMin(minInd,m-1)];
     35:   boxes->max = cArray[PetscMax(minInd,maxInd-1)];
     36:   return 0;
     37: }

     39: static PetscErrorCode VecTaggerComputeBoxes_CDF_Serial(VecTagger tagger,Vec vec,PetscInt bs,VecTaggerBox *boxes)
     40: {
     41:   VecTagger_Simple *smpl = (VecTagger_Simple *) tagger->data;
     42:   Vec              vComp;
     43:   PetscInt         n, m;
     44:   PetscInt         i;
     45: #if defined (PETSC_USE_COMPLEX)
     46:   PetscReal        *cReal, *cImag;
     47: #endif

     49:   VecGetLocalSize(vec,&n);
     50:   m    = n/bs;
     51:   VecCreateSeq(PETSC_COMM_SELF,m,&vComp);
     52: #if defined (PETSC_USE_COMPLEX)
     53:   PetscMalloc2(m,&cReal,m,&cImag);
     54: #endif
     55:   for (i = 0; i < bs; i++) {
     56:     IS          isStride;
     57:     VecScatter  vScat;
     58:     PetscScalar *cArray;

     60:     ISCreateStride(PETSC_COMM_SELF,m,i,bs,&isStride);
     61:     VecScatterCreate(vec,isStride,vComp,NULL,&vScat);
     62:     VecScatterBegin(vScat,vec,vComp,INSERT_VALUES,SCATTER_FORWARD);
     63:     VecScatterEnd(vScat,vec,vComp,INSERT_VALUES,SCATTER_FORWARD);
     64:     VecScatterDestroy(&vScat);
     65:     ISDestroy(&isStride);

     67:     VecGetArray(vComp,&cArray);
     68: #if !defined(PETSC_USE_COMPLEX)
     69:     PetscSortReal(m,cArray);
     70:     VecTaggerComputeBox_CDF_SortedArray(cArray,m,&smpl->box[i],&boxes[i]);
     71: #else
     72:     {
     73:       PetscInt         j;
     74:       VecTaggerBoxReal realBxs, imagBxs;
     75:       VecTaggerBoxReal realBoxes, imagBoxes;

     77:       for (j = 0; j < m; j++) {
     78:         cReal[j] = PetscRealPart(cArray[j]);
     79:         cImag[j] = PetscImaginaryPart(cArray[j]);
     80:       }
     81:       PetscSortReal(m,cReal);
     82:       PetscSortReal(m,cImag);

     84:       realBxs.min = PetscRealPart(smpl->box[i].min);
     85:       realBxs.max = PetscRealPart(smpl->box[i].max);
     86:       imagBxs.min = PetscImaginaryPart(smpl->box[i].min);
     87:       imagBxs.max = PetscImaginaryPart(smpl->box[i].max);
     88:       VecTaggerComputeBox_CDF_SortedArray(cReal,m,&realBxs,&realBoxes);
     89:       VecTaggerComputeBox_CDF_SortedArray(cImag,m,&imagBxs,&imagBoxes);
     90:       boxes[i].min = PetscCMPLX(realBoxes.min,imagBoxes.min);
     91:       boxes[i].max = PetscCMPLX(realBoxes.max,imagBoxes.max);
     92:     }
     93: #endif
     94:     VecRestoreArray(vComp,&cArray);
     95:   }
     96: #if defined(PETSC_USE_COMPLEX)
     97:   PetscFree2(cReal,cImag);
     98: #endif
     99:   VecDestroy(&vComp);
    100:   return 0;
    101: }

    103: static PetscErrorCode VecTaggerComputeBoxes_CDF_Gather(VecTagger tagger,Vec vec,PetscInt bs,VecTaggerBox *boxes)
    104: {
    105:   Vec            gVec = NULL;
    106:   VecScatter     vScat;
    107:   PetscMPIInt    rank;

    109:   VecScatterCreateToZero(vec,&vScat,&gVec);
    110:   VecScatterBegin(vScat,vec,gVec,INSERT_VALUES,SCATTER_FORWARD);
    111:   VecScatterEnd(vScat,vec,gVec,INSERT_VALUES,SCATTER_FORWARD);
    112:   VecScatterDestroy(&vScat);
    113:   MPI_Comm_rank (PetscObjectComm((PetscObject)vec),&rank);
    114:   if (rank == 0) {
    115:     VecTaggerComputeBoxes_CDF_Serial(tagger,gVec,bs,boxes);
    116:   }
    117:   MPI_Bcast((PetscScalar *)boxes,2*bs,MPIU_SCALAR,0,PetscObjectComm((PetscObject)vec));
    118:   VecDestroy(&gVec);
    119:   return 0;
    120: }

    122: typedef struct _n_CDFStats
    123: {
    124:   PetscReal min;
    125:   PetscReal max;
    126:   PetscReal moment[3];
    127: } CDFStats;

    129: static void MPIAPI VecTaggerCDFStatsReduce(void *a, void *b, int * len, MPI_Datatype *datatype)
    130: {
    131:   PetscInt  i, j, N = *len;
    132:   CDFStats *A = (CDFStats *) a;
    133:   CDFStats *B = (CDFStats *) b;

    135:   for (i = 0; i < N; i++) {
    136:     B[i].min = PetscMin(A[i].min,B[i].min);
    137:     B[i].max = PetscMax(A[i].max,B[i].max);
    138:     for (j = 0; j < 3; j++) {
    139:       B[i].moment[j] += A[i].moment[j];
    140:     }
    141:   }
    142: }

    144: static PetscErrorCode CDFUtilInverseEstimate(const CDFStats *stats,PetscReal cdfTarget,PetscReal *absEst)
    145: {
    146:   PetscReal min, max;

    148:   min = stats->min;
    149:   max = stats->max;
    150:   *absEst = min + cdfTarget * (max - min);
    151:   return 0;
    152: }

    154: static PetscErrorCode VecTaggerComputeBox_CDF_SortedArray_Iterative(VecTagger tagger, MPI_Datatype statType, MPI_Op statReduce, const PetscReal *cArray, PetscInt m, const VecTaggerBoxReal *cdfBox, VecTaggerBoxReal *absBox)
    155: {
    156:   MPI_Comm       comm;
    157:   VecTagger_CDF  *cdf;
    158:   PetscInt       maxit, i, j, k, l, M;
    159:   PetscInt       bounds[2][2];
    160:   PetscInt       offsets[2];
    161:   PetscReal      intervalLen = cdfBox->max - cdfBox->min;
    162:   PetscReal      rtol, atol;

    164:   comm  = PetscObjectComm((PetscObject)tagger);
    165:   cdf   = (VecTagger_CDF *) tagger->data;
    166:   maxit = cdf->maxit;
    167:   rtol  = cdf->rtol;
    168:   atol  = cdf->atol;
    169:   /* local range of sorted values that can contain the sought radix */
    170:   offsets[0] = 0;
    171:   offsets[1] = 0;
    172:   bounds[0][0] = 0; bounds[0][1] = m;
    173:   bounds[1][0] = 0; bounds[1][1] = m;
    174:   VecTaggerComputeBox_CDF_SortedArray(cArray,m,cdfBox,absBox); /* compute a local estimate of the interval */
    175:   {
    176:     CDFStats stats[3];

    178:     for (i = 0; i < 2; i++) { /* compute statistics of those local estimates */
    179:       PetscReal val = i ? absBox->max : absBox->min;

    181:       stats[i].min = m ? val : PETSC_MAX_REAL;
    182:       stats[i].max = m ? val : PETSC_MIN_REAL;
    183:       stats[i].moment[0] = m;
    184:       stats[i].moment[1] = m * val;
    185:       stats[i].moment[2] = m * val * val;
    186:     }
    187:     stats[2].min = PETSC_MAX_REAL;
    188:     stats[2].max = PETSC_MAX_REAL;
    189:     for (i = 0; i < 3; i++) {
    190:       stats[2].moment[i] = 0.;
    191:     }
    192:     for (i = 0; i < m; i++) {
    193:       PetscReal val = cArray[i];

    195:       stats[2].min = PetscMin(stats[2].min, val);
    196:       stats[2].max = PetscMax(stats[2].max, val);
    197:       stats[2].moment[0] ++;
    198:       stats[2].moment[1] += val;
    199:       stats[2].moment[2] += val * val;
    200:     }
    201:     /* reduce those statistics */
    202:     MPI_Allreduce(MPI_IN_PLACE,stats,3,statType,statReduce,comm);
    203:     M    = (PetscInt) stats[2].moment[0];
    204:     /* use those initial statistics to get the initial (globally agreed-upon) choices for the absolute box bounds */
    205:     for (i = 0; i < 2; i++) {
    206:       CDFUtilInverseEstimate(&stats[i],i ? cdfBox->max : cdfBox->min,(i ? &absBox->max : &absBox->min));
    207:     }
    208:   }
    209:   /* refine the estimates by computing how close they come to the desired box and refining */
    210:   for (k = 0; k < maxit; k++) {
    211:     PetscReal maxDiff = 0.;

    213:     CDFStats stats[2][2];
    214:     PetscInt newBounds[2][2][2];
    215:     for (i = 0; i < 2; i++) {
    216:       for (j = 0; j < 2; j++) {
    217:         stats[i][j].min = PETSC_MAX_REAL;
    218:         stats[i][j].max = PETSC_MIN_REAL;
    219:         for (l = 0; l < 3; l++) {
    220:           stats[i][j].moment[l] = 0.;
    221:         }
    222:         newBounds[i][j][0] = PetscMax(bounds[i][0],bounds[i][1]);
    223:         newBounds[i][j][1] = PetscMin(bounds[i][0],bounds[i][1]);
    224:       }
    225:     }
    226:     for (i = 0; i < 2; i++) {
    227:       for (j = 0; j < bounds[i][1] - bounds[i][0]; j++) {
    228:         PetscInt  thisInd = bounds[i][0] + j;
    229:         PetscReal val     = cArray[thisInd];
    230:         PetscInt  section;
    231:         if (!i) {
    232:           section = (val <  absBox->min) ? 0 : 1;
    233:         } else {
    234:           section = (val <= absBox->max) ? 0 : 1;
    235:         }
    236:         stats[i][section].min = PetscMin(stats[i][section].min,val);
    237:         stats[i][section].max = PetscMax(stats[i][section].max,val);
    238:         stats[i][section].moment[0] ++;
    239:         stats[i][section].moment[1] += val;
    240:         stats[i][section].moment[2] += val * val;
    241:         newBounds[i][section][0] = PetscMin(newBounds[i][section][0],thisInd);
    242:         newBounds[i][section][1] = PetscMax(newBounds[i][section][0],thisInd + 1);
    243:       }
    244:     }
    245:     MPI_Allreduce(MPI_IN_PLACE, stats, 4, statType, statReduce, comm);
    246:     for (i = 0; i < 2; i++) {
    247:       PetscInt  totalLessThan = offsets[i] + stats[i][0].moment[0];
    248:       PetscReal cdfOfAbs      = (PetscReal) totalLessThan / (PetscReal) M;
    249:       PetscReal diff;
    250:       PetscInt  section;

    252:       if (cdfOfAbs == (i ? cdfBox->max : cdfBox->min)) {
    253:         offsets[i] = totalLessThan;
    254:         bounds[i][0] = bounds[i][1] = 0;
    255:         continue;
    256:       }
    257:       if (cdfOfAbs > (i ? cdfBox->max : cdfBox->min)) { /* the correct absolute value lies in the lower section */
    258:         section = 0;
    259:       } else {
    260:         section = 1;
    261:         offsets[i] = totalLessThan;
    262:       }
    263:       for (j = 0; j < 2; j++) {
    264:         bounds[i][j] = newBounds[i][section][j];
    265:       }
    266:       CDFUtilInverseEstimate(&stats[i][section],((i ? cdfBox->max : cdfBox->min) - ((PetscReal) offsets[i] / (PetscReal) M))/stats[i][section].moment[0],(i ? &absBox->max : &absBox->min));
    267:       diff = PetscAbs(cdfOfAbs - (i ? cdfBox->max : cdfBox->min));
    268:       maxDiff = PetscMax(maxDiff,diff);
    269:     }
    270:     if (!maxDiff) return 0;
    271:     if ((atol || rtol) && ((!atol) || (maxDiff <= atol)) && ((!rtol) || (maxDiff <= rtol * intervalLen))) {
    272:       break;
    273:     }
    274:   }
    275:   return 0;
    276: }

    278: static PetscErrorCode VecTaggerComputeBoxes_CDF_Iterative(VecTagger tagger,Vec vec,PetscInt bs,VecTaggerBox *boxes)
    279: {
    280:   VecTagger_CDF    *cdf = (VecTagger_CDF *) tagger->data;
    281:   VecTagger_Simple *smpl = &(cdf->smpl);
    282:   Vec              vComp;
    283:   PetscInt         i, N, M, n, m, rstart;
    284: #if defined (PETSC_USE_COMPLEX)
    285:   PetscReal        *cReal, *cImag;
    286: #endif
    287:   MPI_Comm         comm;
    288:   MPI_Datatype     statType;
    289:   MPI_Op           statReduce;

    291:   comm = PetscObjectComm((PetscObject)vec);
    292:   VecGetSize(vec,&N);
    293:   VecGetLocalSize(vec,&n);
    294:   M    = N/bs;
    295:   m    = n/bs;
    296:   VecCreateMPI(comm,m,M,&vComp);
    297:   VecSetUp(vComp);
    298:   VecGetOwnershipRange(vComp,&rstart,NULL);
    299: #if defined (PETSC_USE_COMPLEX)
    300:   PetscMalloc2(m,&cReal,m,&cImag);
    301: #endif
    302:   MPI_Type_contiguous(5,MPIU_REAL,&statType);
    303:   MPI_Type_commit(&statType);
    304:   MPI_Op_create(VecTaggerCDFStatsReduce,1,&statReduce);
    305:   for (i = 0; i < bs; i++) {
    306:     IS          isStride;
    307:     VecScatter  vScat;
    308:     PetscScalar *cArray;

    310:     ISCreateStride(comm,m,bs * rstart + i,bs,&isStride);
    311:     VecScatterCreate(vec,isStride,vComp,NULL,&vScat);
    312:     VecScatterBegin(vScat,vec,vComp,INSERT_VALUES,SCATTER_FORWARD);
    313:     VecScatterEnd(vScat,vec,vComp,INSERT_VALUES,SCATTER_FORWARD);
    314:     VecScatterDestroy(&vScat);
    315:     ISDestroy(&isStride);

    317:     VecGetArray(vComp,&cArray);
    318: #if !defined(PETSC_USE_COMPLEX)
    319:     PetscSortReal(m,cArray);
    320:     VecTaggerComputeBox_CDF_SortedArray_Iterative(tagger,statType,statReduce,cArray,m,&smpl->box[i],&boxes[i]);
    321: #else
    322:     {
    323:       PetscInt         j;
    324:       VecTaggerBoxReal realBxs, imagBxs;
    325:       VecTaggerBoxReal realBoxes, imagBoxes;

    327:       for (j = 0; j < m; j++) {
    328:         cReal[j] = PetscRealPart(cArray[j]);
    329:         cImag[j] = PetscImaginaryPart(cArray[j]);
    330:       }
    331:       PetscSortReal(m,cReal);
    332:       PetscSortReal(m,cImag);

    334:       realBxs.min = PetscRealPart(smpl->box[i].min);
    335:       realBxs.max = PetscRealPart(smpl->box[i].max);
    336:       imagBxs.min = PetscImaginaryPart(smpl->box[i].min);
    337:       imagBxs.max = PetscImaginaryPart(smpl->box[i].max);
    338:       VecTaggerComputeBox_CDF_SortedArray_Iterative(tagger,statType,statReduce,cReal,m,&realBxs,&realBoxes);
    339:       VecTaggerComputeBox_CDF_SortedArray_Iterative(tagger,statType,statReduce,cImag,m,&imagBxs,&imagBoxes);
    340:       boxes[i].min = PetscCMPLX(realBoxes.min,imagBoxes.min);
    341:       boxes[i].max = PetscCMPLX(realBoxes.max,imagBoxes.max);
    342:     }
    343: #endif
    344:     VecRestoreArray(vComp,&cArray);
    345:   }
    346:   MPI_Op_free(&statReduce);
    347:   MPI_Type_free(&statType);
    348: #if defined(PETSC_USE_COMPLEX)
    349:   PetscFree2(cReal,cImag);
    350: #endif
    351:   VecDestroy(&vComp);
    352:   return 0;
    353: }

    355: static PetscErrorCode VecTaggerComputeBoxes_CDF(VecTagger tagger,Vec vec,PetscInt *numBoxes,VecTaggerBox **boxes,PetscBool *listed)
    356: {
    357:   VecTagger_CDF  *cuml = (VecTagger_CDF *)tagger->data;
    358:   PetscMPIInt    size;
    359:   PetscInt       bs;
    360:   VecTaggerBox   *bxs;

    362:   VecTaggerGetBlockSize(tagger,&bs);
    363:   *numBoxes = 1;
    364:   PetscMalloc1(bs,&bxs);
    365:   MPI_Comm_size(PetscObjectComm((PetscObject)tagger),&size);
    366:   if (size == 1) {
    367:     VecTaggerComputeBoxes_CDF_Serial(tagger,vec,bs,bxs);
    368:     *boxes = bxs;
    369:     return 0;
    370:   }
    371:   switch (cuml->method) {
    372:   case VECTAGGER_CDF_GATHER:
    373:     VecTaggerComputeBoxes_CDF_Gather(tagger,vec,bs,bxs);
    374:     break;
    375:   case VECTAGGER_CDF_ITERATIVE:
    376:     VecTaggerComputeBoxes_CDF_Iterative(tagger,vec,bs,bxs);
    377:     break;
    378:   default:
    379:     SETERRQ(PetscObjectComm((PetscObject)tagger),PETSC_ERR_SUP,"Unknown CDF calculation/estimation method.");
    380:   }
    381:   *boxes = bxs;
    382:   if (listed) *listed = PETSC_TRUE;
    383:   return 0;
    384: }

    386: static PetscErrorCode VecTaggerView_CDF(VecTagger tagger,PetscViewer viewer)
    387: {
    388:   VecTagger_CDF  *cuml = (VecTagger_CDF *) tagger->data;
    389:   PetscBool      iascii;
    390:   PetscMPIInt    size;

    392:   VecTaggerView_Simple(tagger,viewer);
    393:   MPI_Comm_size(PetscObjectComm((PetscObject)tagger),&size);
    394:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
    395:   if (size > 1 && iascii) {
    396:     PetscViewerASCIIPrintf(viewer,"CDF computation method: %s\n",VecTaggerCDFMethods[cuml->method]);
    397:     if (cuml->method == VECTAGGER_CDF_ITERATIVE) {
    398:       PetscViewerASCIIPushTab(viewer);
    399:       PetscViewerASCIIPrintf(viewer,"max its: %" PetscInt_FMT ", abs tol: %g, rel tol %g\n",cuml->maxit,(double) cuml->atol,(double) cuml->rtol);
    400:       PetscViewerASCIIPopTab(viewer);
    401:     }
    402:   }
    403:   return 0;
    404: }

    406: static PetscErrorCode VecTaggerSetFromOptions_CDF(PetscOptionItems *PetscOptionsObject,VecTagger tagger)
    407: {
    408:   VecTagger_CDF *cuml = (VecTagger_CDF *) tagger->data;
    409:   PetscInt       method;
    410:   PetscBool      set;

    412:   VecTaggerSetFromOptions_Simple(PetscOptionsObject,tagger);
    413:   PetscOptionsHead(PetscOptionsObject,"VecTagger options for CDF boxes");
    414:   PetscOptionsEList("-vec_tagger_cdf_method","Method for computing absolute boxes from CDF boxes","VecTaggerCDFSetMethod()",VecTaggerCDFMethods,VECTAGGER_CDF_NUM_METHODS,VecTaggerCDFMethods[cuml->method],&method,&set);
    415:   if (set) cuml->method = (VecTaggerCDFMethod) method;
    416:   PetscOptionsInt("-vec_tagger_cdf_max_it","Maximum iterations for iterative computation of absolute boxes from CDF boxes","VecTaggerCDFIterativeSetTolerances()",cuml->maxit,&cuml->maxit,NULL);
    417:   PetscOptionsReal("-vec_tagger_cdf_rtol","Maximum relative tolerance for iterative computation of absolute boxes from CDF boxes","VecTaggerCDFIterativeSetTolerances()",cuml->rtol,&cuml->rtol,NULL);
    418:   PetscOptionsReal("-vec_tagger_cdf_atol","Maximum absolute tolerance for iterative computation of absolute boxes from CDF boxes","VecTaggerCDFIterativeSetTolerances()",cuml->atol,&cuml->atol,NULL);
    419:   PetscOptionsTail();
    420:   return 0;
    421: }

    423: /*@C
    424:   VecTaggerCDFSetMethod - Set the method used to compute absolute boxes from CDF boxes

    426:   Logically Collective on VecTagger

    428:   Level: advanced

    430:   Input Parameters:
    431: + tagger - the VecTagger context
    432: - method - the method

    434: .seealso VecTaggerCDFMethod
    435: @*/
    436: PetscErrorCode VecTaggerCDFSetMethod(VecTagger tagger, VecTaggerCDFMethod method)
    437: {
    438:   VecTagger_CDF  *cuml = (VecTagger_CDF *) tagger->data;

    442:   cuml->method = method;
    443:   return 0;
    444: }

    446: /*@C
    447:   VecTaggerCDFGetMethod - Get the method used to compute absolute boxes from CDF boxes

    449:   Logically Collective on VecTagger

    451:   Level: advanced

    453:   Input Parameters:
    454: . tagger - the VecTagger context

    456:   Output Parameters:
    457: . method - the method

    459: .seealso VecTaggerCDFMethod
    460: @*/
    461: PetscErrorCode VecTaggerCDFGetMethod(VecTagger tagger, VecTaggerCDFMethod *method)
    462: {
    463:   VecTagger_CDF  *cuml = (VecTagger_CDF *) tagger->data;

    467:   *method = cuml->method;
    468:   return 0;
    469: }

    471: /*@C
    472:   VecTaggerCDFIterativeSetTolerances - Set the tolerances for iterative computation of absolute boxes from CDF boxes.

    474:   Logically Collective on VecTagger

    476:   Input Parameters:
    477: + tagger - the VecTagger context
    478: . maxit - the maximum number of iterations: 0 indicates the absolute values will be estimated from an initial guess based only on the minimum, maximum, mean, and standard deviation of the box endpoints.
    479: . rtol - the acceptable relative tolerance in the absolute values from the initial guess
    480: - atol - the acceptable absolute tolerance in the absolute values from the initial guess

    482:   Level: advanced

    484: .seealso: VecTaggerCDFSetMethod()
    485: @*/
    486: PetscErrorCode VecTaggerCDFIterativeSetTolerances(VecTagger tagger, PetscInt maxit, PetscReal rtol, PetscReal atol)
    487: {
    488:   VecTagger_CDF  *cuml = (VecTagger_CDF *) tagger->data;

    494:   cuml->maxit = maxit;
    495:   cuml->rtol  = rtol;
    496:   cuml->atol  = atol;
    497:   return 0;
    498: }

    500: /*@C
    501:   VecTaggerCDFIterativeGetTolerances - Get the tolerances for iterative computation of absolute boxes from CDF boxes.

    503:   Logically Collective on VecTagger

    505:   Input Parameter:
    506: . tagger - the VecTagger context

    508:   Output Parameters:
    509: + maxit - the maximum number of iterations: 0 indicates the absolute values will be estimated from an initial guess based only on the minimum, maximum, mean, and standard deviation of the box endpoints.
    510: . rtol - the acceptable relative tolerance in the absolute values from the initial guess
    511: - atol - the acceptable absolute tolerance in the absolute values from the initial guess

    513:   Level: advanced

    515: .seealso: VecTaggerCDFSetMethod()
    516: @*/
    517: PetscErrorCode VecTaggerCDFIterativeGetTolerances(VecTagger tagger, PetscInt *maxit, PetscReal *rtol, PetscReal *atol)
    518: {
    519:   VecTagger_CDF  *cuml = (VecTagger_CDF *) tagger->data;

    522:   if (maxit) *maxit = cuml->maxit;
    523:   if (rtol)  *rtol  = cuml->rtol;
    524:   if (atol)  *atol  = cuml->atol;
    525:   return 0;
    526: }

    528: /*@C
    529:   VecTaggerCDFSetBox - Set the cumulative box defining the values to be tagged by the tagger, where cumulative boxes are subsets of [0,1], where 0 indicates the smallest value present in the vector and 1 indicates the largest.

    531:   Logically Collective

    533:   Input Parameters:
    534: + tagger - the VecTagger context
    535: - boxes - a blocksize array of VecTaggerBox boxes

    537:   Level: advanced

    539: .seealso: VecTaggerCDFGetBox()
    540: @*/
    541: PetscErrorCode VecTaggerCDFSetBox(VecTagger tagger,VecTaggerBox *box)
    542: {
    543:   VecTaggerSetBox_Simple(tagger,box);
    544:   return 0;
    545: }

    547: /*@C
    548:   VecTaggerCDFGetBox - Get the cumulative box (multi-dimensional box) defining the values to be tagged by the tagger, where cumulative boxes are subsets of [0,1], where 0 indicates the smallest value present in the vector and 1 indicates the largest.

    550:   Logically Collective

    552:   Input Parameter:
    553: . tagger - the VecTagger context

    555:   Output Parameter:
    556: . boxes - a blocksize array of VecTaggerBox boxes

    558:   Level: advanced

    560: .seealso: VecTaggerCDFSetBox()
    561: @*/
    562: PetscErrorCode VecTaggerCDFGetBox(VecTagger tagger,const VecTaggerBox **box)
    563: {
    564:   VecTaggerGetBox_Simple(tagger,box);
    565:   return 0;
    566: }

    568: PETSC_INTERN PetscErrorCode VecTaggerCreate_CDF(VecTagger tagger)
    569: {
    570:   VecTagger_CDF  *cuml;

    572:   VecTaggerCreate_Simple(tagger);
    573:   PetscNewLog(tagger,&cuml);
    574:   PetscMemcpy(&cuml->smpl,tagger->data,sizeof(VecTagger_Simple));
    575:   PetscFree(tagger->data);
    576:   tagger->data = cuml;
    577:   tagger->ops->view           = VecTaggerView_CDF;
    578:   tagger->ops->setfromoptions = VecTaggerSetFromOptions_CDF;
    579:   tagger->ops->computeboxes   = VecTaggerComputeBoxes_CDF;
    580:   return 0;
    581: }