Actual source code: vsection.c

petsc-3.6.1 2015-07-22
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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:   PetscViewerASCIISynchronizedAllow(viewer, PETSC_TRUE);
 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:   VecRestoreArray(v, &array);
 66:   return(0);
 67: }

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

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

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

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

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

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

120:   Not collective

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

129:   Level: developer

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

294:   Level: intermediate

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

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

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