Actual source code: vsection.c
petsc-3.7.1 2016-05-15
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      1: /*
      2:    This file contains routines for section object operations on Vecs
      3: */
      4: #include <petsc/private/isimpl.h>   /*I  "petscvec.h"   I*/
      5: #include <petsc/private/vecimpl.h>   /*I  "petscvec.h"   I*/

      9: PetscErrorCode PetscSectionVecView_ASCII(PetscSection s, Vec v, PetscViewer viewer)
     10: {
     11:   PetscScalar    *array;
     12:   PetscInt       p, i;
     13:   PetscMPIInt    rank;

     17:   MPI_Comm_rank(PetscObjectComm((PetscObject)viewer), &rank);
     18:   VecGetArray(v, &array);
     19:   PetscViewerASCIIPushSynchronized(viewer);
     20:   PetscViewerASCIISynchronizedPrintf(viewer, "Process %d:\n", rank);
     21:   for (p = 0; p < s->pEnd - s->pStart; ++p) {
     22:     if ((s->bc) && (s->bc->atlasDof[p] > 0)) {
     23:       PetscInt b;

     25:       PetscViewerASCIISynchronizedPrintf(viewer, "  (%4D) dim %2D offset %3D", p+s->pStart, s->atlasDof[p], s->atlasOff[p]);
     26:       for (i = s->atlasOff[p]; i < s->atlasOff[p]+s->atlasDof[p]; ++i) {
     27:         PetscScalar v = array[i];
     28: #if defined(PETSC_USE_COMPLEX)
     29:         if (PetscImaginaryPart(v) > 0.0) {
     30:           PetscViewerASCIISynchronizedPrintf(viewer," %g + %g i", (double)PetscRealPart(v), (double)PetscImaginaryPart(v));
     31:         } else if (PetscImaginaryPart(v) < 0.0) {
     32:           PetscViewerASCIISynchronizedPrintf(viewer," %g - %g i", (double)PetscRealPart(v),(double)(-PetscImaginaryPart(v)));
     33:         } else {
     34:           PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)PetscRealPart(v));
     35:         }
     36: #else
     37:         PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)v);
     38: #endif
     39:       }
     40:       PetscViewerASCIISynchronizedPrintf(viewer, " constrained");
     41:       for (b = 0; b < s->bc->atlasDof[p]; ++b) {
     42:         PetscViewerASCIISynchronizedPrintf(viewer, " %D", s->bcIndices[s->bc->atlasOff[p]+b]);
     43:       }
     44:       PetscViewerASCIISynchronizedPrintf(viewer, "\n");
     45:     } else {
     46:       PetscViewerASCIISynchronizedPrintf(viewer, "  (%4D) dim %2D offset %3D", p+s->pStart, s->atlasDof[p], s->atlasOff[p]);
     47:       for (i = s->atlasOff[p]; i < s->atlasOff[p]+s->atlasDof[p]; ++i) {
     48:         PetscScalar v = array[i];
     49: #if defined(PETSC_USE_COMPLEX)
     50:         if (PetscImaginaryPart(v) > 0.0) {
     51:           PetscViewerASCIISynchronizedPrintf(viewer," %g + %g i", (double)PetscRealPart(v), (double)PetscImaginaryPart(v));
     52:         } else if (PetscImaginaryPart(v) < 0.0) {
     53:           PetscViewerASCIISynchronizedPrintf(viewer," %g - %g i", (double)PetscRealPart(v),(double)(-PetscImaginaryPart(v)));
     54:         } else {
     55:           PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)PetscRealPart(v));
     56:         }
     57: #else
     58:         PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)v);
     59: #endif
     60:       }
     61:       PetscViewerASCIISynchronizedPrintf(viewer, "\n");
     62:     }
     63:   }
     64:   PetscViewerFlush(viewer);
     65:   PetscViewerASCIIPopSynchronized(viewer);
     66:   VecRestoreArray(v, &array);
     67:   return(0);
     68: }

     72: PetscErrorCode PetscSectionVecView(PetscSection s, Vec v, PetscViewer viewer)
     73: {
     74:   PetscBool      isascii;
     75:   PetscInt       f;

     79:   if (!viewer) {PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)v), &viewer);}
     82:   PetscObjectTypeCompare((PetscObject) viewer, PETSCVIEWERASCII, &isascii);
     83:   if (isascii) {
     84:     const char *name;

     86:     PetscObjectGetName((PetscObject) v, &name);
     87:     if (s->numFields) {
     88:       PetscViewerASCIIPrintf(viewer, "%s with %D fields\n", name, s->numFields);
     89:       for (f = 0; f < s->numFields; ++f) {
     90:         PetscViewerASCIIPrintf(viewer, "  field %D with %D components\n", f, s->numFieldComponents[f]);
     91:         PetscSectionVecView_ASCII(s->field[f], v, viewer);
     92:       }
     93:     } else {
     94:       PetscViewerASCIIPrintf(viewer, "%s\n", name);
     95:       PetscSectionVecView_ASCII(s, v, viewer);
     96:     }
     97:   }
     98:   return(0);
     99: }

    103: PetscErrorCode VecGetValuesSection(Vec v, PetscSection s, PetscInt point, PetscScalar **values)
    104: {
    105:   PetscScalar    *baseArray;
    106:   const PetscInt p = point - s->pStart;

    110:   VecGetArray(v, &baseArray);
    111:   *values = &baseArray[s->atlasOff[p]];
    112:   VecRestoreArray(v, &baseArray);
    113:   return(0);
    114: }

    118: /*@C
    119:   VecSetValuesSection - Sets all the values associated with a given point, according to the section, in the given Vec

    121:   Not collective

    123:   Input Parameters:
    124: + v - the Vec
    125: . s - the organizing PetscSection
    126: . point - the point
    127: . values - the array of input values
    128: - mode - the insertion mode, either ADD_VALUES or INSERT_VALUES

    130:   Level: developer

    132:   Note: This is similar to MatSetValuesStencil(). The Fortran binding is
    133: $
    134: $   VecSetValuesSectionF90(vec, section, point, values, mode, ierr)
    135: $

    137: .seealso: PetscSection, PetscSectionCreate()
    138: @*/
    139: PetscErrorCode VecSetValuesSection(Vec v, PetscSection s, PetscInt point, PetscScalar values[], InsertMode mode)
    140: {
    141:   PetscScalar     *baseArray, *array;
    142:   const PetscBool doInsert    = mode == INSERT_VALUES     || mode == INSERT_ALL_VALUES || mode == INSERT_BC_VALUES                          ? PETSC_TRUE : PETSC_FALSE;
    143:   const PetscBool doInterior  = mode == INSERT_ALL_VALUES || mode == ADD_ALL_VALUES    || mode == INSERT_VALUES    || mode == ADD_VALUES    ? PETSC_TRUE : PETSC_FALSE;
    144:   const PetscBool doBC        = mode == INSERT_ALL_VALUES || mode == ADD_ALL_VALUES    || mode == INSERT_BC_VALUES || mode == ADD_BC_VALUES ? PETSC_TRUE : PETSC_FALSE;
    145:   const PetscInt  p           = point - s->pStart;
    146:   const PetscInt  orientation = 0; /* Needs to be included for use in closure operations */
    147:   PetscInt        cDim        = 0;
    148:   PetscErrorCode  ierr;

    151:   PetscSectionGetConstraintDof(s, point, &cDim);
    152:   VecGetArray(v, &baseArray);
    153:   array = &baseArray[s->atlasOff[p]];
    154:   if (!cDim && doInterior) {
    155:     if (orientation >= 0) {
    156:       const PetscInt dim = s->atlasDof[p];
    157:       PetscInt       i;

    159:       if (doInsert) {
    160:         for (i = 0; i < dim; ++i) array[i] = values[i];
    161:       } else {
    162:         for (i = 0; i < dim; ++i) array[i] += values[i];
    163:       }
    164:     } else {
    165:       PetscInt offset = 0;
    166:       PetscInt j      = -1, field, i;

    168:       for (field = 0; field < s->numFields; ++field) {
    169:         const PetscInt dim = s->field[field]->atlasDof[p]; /* PetscSectionGetFieldDof() */

    171:         for (i = dim-1; i >= 0; --i) array[++j] = values[i+offset];
    172:         offset += dim;
    173:       }
    174:     }
    175:   } else if (cDim) {
    176:     if (orientation >= 0) {
    177:       const PetscInt dim  = s->atlasDof[p];
    178:       PetscInt       cInd = 0, i;
    179:       const PetscInt *cDof;

    181:       PetscSectionGetConstraintIndices(s, point, &cDof);
    182:       if (doInsert) {
    183:         for (i = 0; i < dim; ++i) {
    184:           if ((cInd < cDim) && (i == cDof[cInd])) {
    185:             if (doBC) array[i] = values[i]; /* Constrained update */
    186:             ++cInd;
    187:             continue;
    188:           }
    189:           if (doInterior) array[i] = values[i]; /* Unconstrained update */
    190:         }
    191:       } else {
    192:         for (i = 0; i < dim; ++i) {
    193:           if ((cInd < cDim) && (i == cDof[cInd])) {
    194:             if (doBC) array[i] += values[i]; /* Constrained update */
    195:             ++cInd;
    196:             continue;
    197:           }
    198:           if (doInterior) array[i] += values[i]; /* Unconstrained update */
    199:         }
    200:       }
    201:     } else {
    202:       /* TODO This is broken for add and constrained update */
    203:       const PetscInt *cDof;
    204:       PetscInt       offset  = 0;
    205:       PetscInt       cOffset = 0;
    206:       PetscInt       j       = 0, field;

    208:       PetscSectionGetConstraintIndices(s, point, &cDof);
    209:       for (field = 0; field < s->numFields; ++field) {
    210:         const PetscInt dim  = s->field[field]->atlasDof[p];     /* PetscSectionGetFieldDof() */
    211:         const PetscInt tDim = s->field[field]->bc->atlasDof[p]; /* PetscSectionGetFieldConstraintDof() */
    212:         const PetscInt sDim = dim - tDim;
    213:         PetscInt       cInd = 0, i ,k;

    215:         for (i = 0, k = dim+offset-1; i < dim; ++i, ++j, --k) {
    216:           if ((cInd < sDim) && (j == cDof[cInd+cOffset])) {++cInd; continue;}
    217:           if (doInterior) array[j] = values[k];   /* Unconstrained update */
    218:         }
    219:         offset  += dim;
    220:         cOffset += dim - tDim;
    221:       }
    222:     }
    223:   }
    224:   VecRestoreArray(v, &baseArray);
    225:   return(0);
    226: }

    230: PetscErrorCode PetscSectionGetField_Internal(PetscSection section, PetscSection sectionGlobal, Vec v, PetscInt field, PetscInt pStart, PetscInt pEnd, IS *is, Vec *subv)
    231: {
    232:   PetscInt      *subIndices;
    233:   PetscInt       Nc, subSize = 0, subOff = 0, p;

    237:   PetscSectionGetFieldComponents(section, field, &Nc);
    238:   for (p = pStart; p < pEnd; ++p) {
    239:     PetscInt gdof, fdof = 0;

    241:     PetscSectionGetDof(sectionGlobal, p, &gdof);
    242:     if (gdof > 0) {PetscSectionGetFieldDof(section, p, field, &fdof);}
    243:     subSize += fdof;
    244:   }
    245:   PetscMalloc1(subSize, &subIndices);
    246:   for (p = pStart; p < pEnd; ++p) {
    247:     PetscInt gdof, goff;

    249:     PetscSectionGetDof(sectionGlobal, p, &gdof);
    250:     if (gdof > 0) {
    251:       PetscInt fdof, fc, f2, poff = 0;

    253:       PetscSectionGetOffset(sectionGlobal, p, &goff);
    254:       /* Can get rid of this loop by storing field information in the global section */
    255:       for (f2 = 0; f2 < field; ++f2) {
    256:         PetscSectionGetFieldDof(section, p, f2, &fdof);
    257:         poff += fdof;
    258:       }
    259:       PetscSectionGetFieldDof(section, p, field, &fdof);
    260:       for (fc = 0; fc < fdof; ++fc, ++subOff) subIndices[subOff] = goff+poff+fc;
    261:     }
    262:   }
    263:   ISCreateGeneral(PetscObjectComm((PetscObject) v), subSize, subIndices, PETSC_OWN_POINTER, is);
    264:   VecGetSubVector(v, *is, subv);
    265:   VecSetBlockSize(*subv, Nc);
    266:   return(0);
    267: }

    271: PetscErrorCode PetscSectionRestoreField_Internal(PetscSection section, PetscSection sectionGlobal, Vec v, PetscInt field, PetscInt pStart, PetscInt pEnd, IS *is, Vec *subv)
    272: {

    276:   VecRestoreSubVector(v, *is, subv);
    277:   ISDestroy(is);
    278:   return(0);
    279: }

    283: /*@C
    284:   PetscSectionVecNorm - Computes the vector norm, separated into field components.

    286:   Input Parameters:
    287: + s    - the local Section
    288: . gs   - the global section
    289: . x    - the vector
    290: - type - one of NORM_1, NORM_2, NORM_INFINITY.

    292:   Output Parameter:
    293: . val  - the array of norms

    295:   Level: intermediate

    297: .seealso: VecNorm(), PetscSectionCreate()
    298: @*/
    299: PetscErrorCode PetscSectionVecNorm(PetscSection s, PetscSection gs, Vec x, NormType type, PetscReal val[])
    300: {
    301:   PetscInt       Nf, f, pStart, pEnd;

    309:   PetscSectionGetNumFields(s, &Nf);
    310:   if (Nf < 2) {VecNorm(x, type, val);}
    311:   else {
    312:     PetscSectionGetChart(s, &pStart, &pEnd);
    313:     for (f = 0; f < Nf; ++f) {
    314:       Vec subv;
    315:       IS  is;

    317:       PetscSectionGetField_Internal(s, gs, x, f, pStart, pEnd, &is, &subv);
    318:       VecNorm(subv, type, &val[f]);
    319:       PetscSectionRestoreField_Internal(s, gs, x, f, pStart, pEnd, &is, &subv);
    320:     }
    321:   }
    322:   return(0);
    323: }