Actual source code: stag.c
petsc-3.12.0 2019-09-29
1: /*
2: Implementation of DMStag, defining dimension-independent functions in the
3: DM API. stag1d.c, stag2d.c, and stag3d.c may include dimension-specific
4: implementations of DM API functions, and other files here contain additional
5: DMStag-specific API functions (and internal functions).
6: */
7: #include <petsc/private/dmstagimpl.h>
8: #include <petscsf.h>
10: /*MC
11: DMSTAG = "stag"
13: Level: intermediate
15: .seealso: DMType, DMCreate(), DMSetType()
16: M*/
18: static PetscErrorCode DMDestroy_Stag(DM dm)
19: {
21: DM_Stag *stag;
22: PetscInt i;
25: stag = (DM_Stag*)dm->data;
26: for (i=0; i<DMSTAG_MAX_DIM; ++i) {
27: PetscFree(stag->l[i]);
28: }
29: VecScatterDestroy(&stag->gtol);
30: VecScatterDestroy(&stag->ltog_injective);
31: PetscFree(stag->neighbors);
32: PetscFree(stag->locationOffsets);
33: PetscFree(stag);
34: return(0);
35: }
37: static PetscErrorCode DMCreateGlobalVector_Stag(DM dm,Vec *vec)
38: {
39: PetscErrorCode ierr;
40: DM_Stag * const stag = (DM_Stag*)dm->data;
43: VecCreateMPI(PetscObjectComm((PetscObject)dm),stag->entries,PETSC_DECIDE,vec);
44: VecSetDM(*vec,dm);
45: /* Could set some ops, as DMDA does */
46: VecSetLocalToGlobalMapping(*vec,dm->ltogmap);
47: return(0);
48: }
50: static PetscErrorCode DMCreateLocalVector_Stag(DM dm,Vec *vec)
51: {
52: PetscErrorCode ierr;
53: DM_Stag * const stag = (DM_Stag*)dm->data;
56: VecCreateSeq(PETSC_COMM_SELF,stag->entriesGhost,vec);
57: VecSetBlockSize(*vec,stag->entriesPerElement);
58: VecSetDM(*vec,dm);
59: return(0);
60: }
62: static PetscErrorCode DMCreateMatrix_Stag(DM dm,Mat *mat)
63: {
64: PetscErrorCode ierr;
65: const DM_Stag * const stag = (DM_Stag*)dm->data;
66: MatType matType;
67: PetscBool isaij,isshell;
68: PetscInt width,nNeighbors,dim;
69: ISLocalToGlobalMapping ltogmap;
72: DMGetDimension(dm,&dim);
73: DMGetMatType(dm,&matType);
74: PetscStrcmp(matType,MATAIJ,&isaij);
75: PetscStrcmp(matType,MATSHELL,&isshell);
77: if (isaij) {
78: /* This implementation gives a very dense stencil, which is likely unsuitable for
79: real applications. */
80: switch (stag->stencilType) {
81: case DMSTAG_STENCIL_NONE:
82: nNeighbors = 1;
83: break;
84: case DMSTAG_STENCIL_STAR:
85: switch (dim) {
86: case 1 :
87: nNeighbors = 2*stag->stencilWidth + 1;
88: break;
89: case 2 :
90: nNeighbors = 4*stag->stencilWidth + 3;
91: break;
92: case 3 :
93: nNeighbors = 6*stag->stencilWidth + 5;
94: break;
95: default : SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_OUTOFRANGE,"Unsupported dimension %d",dim);
96: }
97: break;
98: case DMSTAG_STENCIL_BOX:
99: switch (dim) {
100: case 1 :
101: nNeighbors = (2*stag->stencilWidth + 1);
102: break;
103: case 2 :
104: nNeighbors = (2*stag->stencilWidth + 1) * (2*stag->stencilWidth + 1);
105: break;
106: case 3 :
107: nNeighbors = (2*stag->stencilWidth + 1) * (2*stag->stencilWidth + 1) * (2*stag->stencilWidth + 1);
108: break;
109: default : SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_OUTOFRANGE,"Unsupported dimension %d",dim);
110: }
111: break;
112: default : SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_OUTOFRANGE,"Unsupported stencil");
113: }
114: width = (stag->dof[0] + stag->dof[1] + stag->dof[2] + stag->dof[3]) * nNeighbors;
115: MatCreateAIJ(PETSC_COMM_WORLD,stag->entries,stag->entries,PETSC_DETERMINE,PETSC_DETERMINE,width,NULL,width,NULL,mat);
116: } else if (isshell) {
117: MatCreate(PetscObjectComm((PetscObject)dm),mat);
118: MatSetSizes(*mat,stag->entries,stag->entries,PETSC_DETERMINE,PETSC_DETERMINE);
119: MatSetType(*mat,MATSHELL);
120: MatSetUp(*mat);
121: } else SETERRQ1(PETSC_COMM_WORLD,PETSC_ERR_SUP,"Not implemented for Mattype %s",matType);
123: DMGetLocalToGlobalMapping(dm,<ogmap);
124: MatSetLocalToGlobalMapping(*mat,ltogmap,ltogmap);
125: MatSetDM(*mat,dm);
126: return(0);
127: }
129: static PetscErrorCode DMGetCompatibility_Stag(DM dm,DM dm2,PetscBool *compatible,PetscBool *set)
130: {
131: PetscErrorCode ierr;
132: const DM_Stag * const stag = (DM_Stag*)dm->data;
133: const DM_Stag * const stag2 = (DM_Stag*)dm2->data;
134: PetscInt dim,dim2,i;
135: MPI_Comm comm;
136: PetscMPIInt sameComm;
137: DMType type2;
138: PetscBool sameType;
141: DMGetType(dm2,&type2);
142: PetscStrcmp(DMSTAG,type2,&sameType);
143: if (!sameType) {
144: PetscInfo1((PetscObject)dm,"DMStag compatibility check not implemented with DM of type %s\n",type2);
145: *set = PETSC_FALSE;
146: return(0);
147: }
149: PetscObjectGetComm((PetscObject)dm,&comm);
150: MPI_Comm_compare(comm,PetscObjectComm((PetscObject)dm2),&sameComm);
151: if (sameComm != MPI_IDENT) {
152: PetscInfo2((PetscObject)dm,"DMStag objects have different communicators: %d != %d\n",comm,PetscObjectComm((PetscObject)dm2));
153: *set = PETSC_FALSE;
154: return(0);
155: }
156: DMGetDimension(dm ,&dim );
157: DMGetDimension(dm2,&dim2);
158: if (dim != dim2) {
159: PetscInfo((PetscObject)dm,"DMStag objects have different dimensions");
160: *set = PETSC_TRUE;
161: *compatible = PETSC_FALSE;
162: return(0);
163: }
164: for (i=0; i<dim; ++i) {
165: if (stag->N[i] != stag2->N[i]) {
166: PetscInfo3((PetscObject)dm,"DMStag objects have different global numbers of elements in dimension %D: %D != %D\n",i,stag->n[i],stag2->n[i]);
167: *set = PETSC_TRUE;
168: *compatible = PETSC_FALSE;
169: return(0);
170: }
171: if (stag->n[i] != stag2->n[i]) {
172: PetscInfo3((PetscObject)dm,"DMStag objects have different local numbers of elements in dimension %D: %D != %D\n",i,stag->n[i],stag2->n[i]);
173: *set = PETSC_TRUE;
174: *compatible = PETSC_FALSE;
175: return(0);
176: }
177: if (stag->boundaryType[i] != stag2->boundaryType[i]) {
178: PetscInfo3((PetscObject)dm,"DMStag objects have different boundary types in dimension %d: %s != %s\n",i,stag->boundaryType[i],stag2->boundaryType[i]);
179: *set = PETSC_TRUE;
180: *compatible = PETSC_FALSE;
181: return(0);
182: }
183: }
184: /* Note: we include stencil type and width in the notion of compatibility, as this affects
185: the "atlas" (local subdomains). This might be irritating in legitimate cases
186: of wanting to transfer between two other-wise compatible DMs with different
187: stencil characteristics. */
188: if (stag->stencilType != stag2->stencilType) {
189: PetscInfo2((PetscObject)dm,"DMStag objects have different ghost stencil types: %s != %s\n",DMStagStencilTypes[stag->stencilType],DMStagStencilTypes[stag2->stencilType]);
190: *set = PETSC_TRUE;
191: *compatible = PETSC_FALSE;
192: return(0);
193: }
194: if (stag->stencilWidth != stag2->stencilWidth) {
195: PetscInfo2((PetscObject)dm,"DMStag objects have different ghost stencil widths: %D != %D\n",stag->stencilWidth,stag->stencilWidth);
196: *set = PETSC_TRUE;
197: *compatible = PETSC_FALSE;
198: return(0);
199: }
200: *set = PETSC_TRUE;
201: *compatible = PETSC_TRUE;
202: return(0);
203: }
206: /*
207: Note there are several orderings in play here.
208: In all cases, non-element dof are associated with the element that they are below/left/behind, and the order in 2D proceeds vertex/bottom edge/left edge/element (with all dof on each together).
209: Also in all cases, only subdomains which are the last in their dimension have partial elements.
211: 1) "Natural" Ordering (not used). Number adding each full or partial (on the right or top) element, starting at the bottom left (i=0,j=0) and proceeding across the entire domain, row by row to get a global numbering.
212: 2) Global ("PETSc") ordering. The same as natural, but restricted to each domain. So, traverse all elements (again starting at the bottom left and going row-by-row) on rank 0, then continue numbering with rank 1, and so on.
213: 3) Local ordering. Including ghost elements (both interior and on the right/top/front to complete partial elements), use the same convention to create a local numbering.
214: */
216: static PetscErrorCode DMLocalToGlobalBegin_Stag(DM dm,Vec l,InsertMode mode,Vec g)
217: {
218: PetscErrorCode ierr;
219: DM_Stag * const stag = (DM_Stag*)dm->data;
222: if (mode == ADD_VALUES) {
223: VecScatterBegin(stag->gtol,l,g,mode,SCATTER_REVERSE);
224: } else if (mode == INSERT_VALUES) {
225: if (stag->ltog_injective) {
226: VecScatterBegin(stag->ltog_injective,l,g,mode,SCATTER_FORWARD);
227: } else {
228: VecScatterBegin(stag->gtol,l,g,mode,SCATTER_REVERSE_LOCAL);
229: }
230: } else SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Unsupported InsertMode");
231: return(0);
232: }
234: static PetscErrorCode DMLocalToGlobalEnd_Stag(DM dm,Vec l,InsertMode mode,Vec g)
235: {
236: PetscErrorCode ierr;
237: DM_Stag * const stag = (DM_Stag*)dm->data;
240: if (mode == ADD_VALUES) {
241: VecScatterEnd(stag->gtol,l,g,mode,SCATTER_REVERSE);
242: } else if (mode == INSERT_VALUES) {
243: if (stag->ltog_injective) {
244: VecScatterEnd(stag->ltog_injective,l,g,mode,SCATTER_FORWARD);
245: } else {
246: VecScatterEnd(stag->gtol,l,g,mode,SCATTER_REVERSE_LOCAL);
247: }
248: } else SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Unsupported InsertMode");
249: return(0);
250: }
252: static PetscErrorCode DMGlobalToLocalBegin_Stag(DM dm,Vec g,InsertMode mode,Vec l)
253: {
254: PetscErrorCode ierr;
255: DM_Stag * const stag = (DM_Stag*)dm->data;
258: VecScatterBegin(stag->gtol,g,l,mode,SCATTER_FORWARD);
259: return(0);
260: }
262: static PetscErrorCode DMGlobalToLocalEnd_Stag(DM dm,Vec g,InsertMode mode,Vec l)
263: {
264: PetscErrorCode ierr;
265: DM_Stag * const stag = (DM_Stag*)dm->data;
268: VecScatterEnd(stag->gtol,g,l,mode,SCATTER_FORWARD);
269: return(0);
270: }
272: /*
273: If a stratum is active (non-zero dof), make it active in the coordinate DM.
274: */
275: static PetscErrorCode DMCreateCoordinateDM_Stag(DM dm,DM *dmc)
276: {
277: PetscErrorCode ierr;
278: DM_Stag * const stag = (DM_Stag*)dm->data;
279: PetscInt dim;
280: PetscBool isstag,isproduct;
284: if (!stag->coordinateDMType) SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_OUTOFRANGE,"Before creating a coordinate DM, a type must be specified with DMStagSetCoordinateDMType()");
286: DMGetDimension(dm,&dim);
287: PetscStrcmp(stag->coordinateDMType,DMSTAG,&isstag);
288: PetscStrcmp(stag->coordinateDMType,DMPRODUCT,&isproduct);
289: if (isstag) {
290: DMStagCreateCompatibleDMStag(dm,
291: stag->dof[0] > 0 ? dim : 0,
292: stag->dof[1] > 0 ? dim : 0,
293: stag->dof[2] > 0 ? dim : 0,
294: stag->dof[3] > 0 ? dim : 0,
295: dmc);
296: } else if (isproduct) {
297: DMCreate(PETSC_COMM_WORLD,dmc);
298: DMSetType(*dmc,DMPRODUCT);
299: DMSetDimension(*dmc,dim);
300: } else SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Unsupported coordinate DM type %s",stag->coordinateDMType);
301: return(0);
302: }
304: static PetscErrorCode DMGetNeighbors_Stag(DM dm,PetscInt *nRanks,const PetscMPIInt *ranks[])
305: {
306: PetscErrorCode ierr;
307: DM_Stag * const stag = (DM_Stag*)dm->data;
308: PetscInt dim;
311: DMGetDimension(dm,&dim);
312: switch (dim) {
313: case 1: *nRanks = 3; break;
314: case 2: *nRanks = 9; break;
315: case 3: *nRanks = 27; break;
316: default : SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"Get neighbors not implemented for dim = %D",dim);
317: }
318: *ranks = stag->neighbors;
319: return(0);
320: }
322: static PetscErrorCode DMView_Stag(DM dm,PetscViewer viewer)
323: {
324: PetscErrorCode ierr;
325: DM_Stag * const stag = (DM_Stag*)dm->data;
326: PetscBool isascii,viewAllRanks;
327: PetscMPIInt rank,size;
328: PetscInt dim,maxRanksToView,i;
331: MPI_Comm_rank(PetscObjectComm((PetscObject)dm),&rank);
332: MPI_Comm_size(PetscObjectComm((PetscObject)dm),&size);
333: DMGetDimension(dm,&dim);
334: PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii);
335: if (isascii) {
336: PetscViewerASCIIPrintf(viewer,"Dimension: %D\n",dim);
337: switch (dim) {
338: case 1:
339: PetscViewerASCIIPrintf(viewer,"Global size: %D\n",stag->N[0]);
340: break;
341: case 2:
342: PetscViewerASCIIPrintf(viewer,"Global sizes: %D x %D\n",stag->N[0],stag->N[1]);
343: PetscViewerASCIIPrintf(viewer,"Parallel decomposition: %D x %D ranks\n",stag->nRanks[0],stag->nRanks[1]);
344: break;
345: case 3:
346: PetscViewerASCIIPrintf(viewer,"Global sizes: %D x %D x %D\n",stag->N[0],stag->N[1],stag->N[2]);
347: PetscViewerASCIIPrintf(viewer,"Parallel decomposition: %D x %D x %D ranks\n",stag->nRanks[0],stag->nRanks[1],stag->nRanks[2]);
348: break;
349: default: SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"not implemented for dim==%D",dim);
350: }
351: PetscViewerASCIIPrintf(viewer,"Boundary ghosting:");
352: for (i=0; i<dim; ++i) {
353: PetscViewerASCIIPrintf(viewer," %s",DMBoundaryTypes[stag->boundaryType[i]]);
354: }
355: PetscViewerASCIIPrintf(viewer,"\n");
356: PetscViewerASCIIPrintf(viewer,"Elementwise ghost stencil: %s, width %D\n",DMStagStencilTypes[stag->stencilType],stag->stencilWidth);
357: PetscViewerASCIIPrintf(viewer,"Stratum dof:");
358: for (i=0; i<dim+1; ++i) {
359: PetscViewerASCIIPrintf(viewer," %D:%D",i,stag->dof[i]);
360: }
361: PetscViewerASCIIPrintf(viewer,"\n");
362: if(dm->coordinateDM) {
363: PetscViewerASCIIPrintf(viewer,"Has coordinate DM\n");
364: }
365: maxRanksToView = 16;
366: viewAllRanks = (PetscBool)(size <= maxRanksToView);
367: if (viewAllRanks) {
368: PetscViewerASCIIPushSynchronized(viewer);
369: switch (dim) {
370: case 1:
371: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Local elements : %D (%D with ghosts)\n",rank,stag->n[0],stag->nGhost[0]);
372: break;
373: case 2:
374: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Rank coordinates (%d,%d)\n",rank,stag->rank[0],stag->rank[1]);
375: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Local elements : %D x %D (%D x %D with ghosts)\n",rank,stag->n[0],stag->n[1],stag->nGhost[0],stag->nGhost[1]);
376: break;
377: case 3:
378: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Rank coordinates (%d,%d,%d)\n",rank,stag->rank[0],stag->rank[1],stag->rank[2]);
379: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Local elements : %D x %D x %D (%D x %D x %D with ghosts)\n",rank,stag->n[0],stag->n[1],stag->n[2],stag->nGhost[0],stag->nGhost[1],stag->nGhost[2]);
380: break;
381: default: SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_SUP,"not implemented for dim==%D",dim);
382: }
383: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Local native entries: %d\n",rank,stag->entries );
384: PetscViewerASCIISynchronizedPrintf(viewer,"[%d] Local entries total : %d\n",rank,stag->entriesGhost);
385: PetscViewerFlush(viewer);
386: PetscViewerASCIIPopSynchronized(viewer);
387: } else {
388: PetscViewerASCIIPrintf(viewer,"(Per-rank information omitted since >%D ranks used)\n",maxRanksToView);
389: }
390: }
391: return(0);
392: }
394: static PetscErrorCode DMSetFromOptions_Stag(PetscOptionItems *PetscOptionsObject,DM dm)
395: {
396: PetscErrorCode ierr;
397: DM_Stag * const stag = (DM_Stag*)dm->data;
398: PetscInt dim;
401: DMGetDimension(dm,&dim);
402: PetscOptionsHead(PetscOptionsObject,"DMStag Options");
403: PetscOptionsInt("-stag_grid_x","Number of grid points in x direction","DMStagSetGlobalSizes",stag->N[0],&stag->N[0],NULL);
404: if (dim > 1) { PetscOptionsInt("-stag_grid_y","Number of grid points in y direction","DMStagSetGlobalSizes",stag->N[1],&stag->N[1],NULL); }
405: if (dim > 2) { PetscOptionsInt("-stag_grid_z","Number of grid points in z direction","DMStagSetGlobalSizes",stag->N[2],&stag->N[2],NULL); }
406: PetscOptionsInt("-stag_ranks_x","Number of ranks in x direction","DMStagSetNumRanks",stag->nRanks[0],&stag->nRanks[0],NULL);
407: if (dim > 1) { PetscOptionsInt("-stag_ranks_y","Number of ranks in y direction","DMStagSetNumRanks",stag->nRanks[1],&stag->nRanks[1],NULL); }
408: if (dim > 2) { PetscOptionsInt("-stag_ranks_z","Number of ranks in z direction","DMStagSetNumRanks",stag->nRanks[2],&stag->nRanks[2],NULL); }
409: PetscOptionsInt("-stag_stencil_width","Elementwise stencil width","DMStagSetStencilWidth",stag->stencilWidth,&stag->stencilWidth,NULL);
410: PetscOptionsEnum("-stag_stencil_type","Elementwise stencil stype","DMStagSetStencilType",DMStagStencilTypes,(PetscEnum)stag->stencilType,(PetscEnum*)&stag->stencilType,NULL);
411: PetscOptionsEnum("-stag_boundary_type_x","Treatment of (physical) boundaries in x direction","DMStagSetBoundaryTypes",DMBoundaryTypes,(PetscEnum)stag->boundaryType[0],(PetscEnum*)&stag->boundaryType[0],NULL);
412: PetscOptionsEnum("-stag_boundary_type_y","Treatment of (physical) boundaries in y direction","DMStagSetBoundaryTypes",DMBoundaryTypes,(PetscEnum)stag->boundaryType[1],(PetscEnum*)&stag->boundaryType[1],NULL);
413: PetscOptionsEnum("-stag_boundary_type_z","Treatment of (physical) boundaries in z direction","DMStagSetBoundaryTypes",DMBoundaryTypes,(PetscEnum)stag->boundaryType[2],(PetscEnum*)&stag->boundaryType[2],NULL);
414: PetscOptionsInt("-stag_dof_0","Number of dof per 0-cell (vertex/corner)","DMStagSetDOF",stag->dof[0],&stag->dof[0],NULL);
415: PetscOptionsInt("-stag_dof_1","Number of dof per 1-cell (edge)", "DMStagSetDOF",stag->dof[1],&stag->dof[1],NULL);
416: PetscOptionsInt("-stag_dof_2","Number of dof per 2-cell (face)", "DMStagSetDOF",stag->dof[2],&stag->dof[2],NULL);
417: PetscOptionsInt("-stag_dof_3","Number of dof per 3-cell (hexahedron)", "DMStagSetDOF",stag->dof[3],&stag->dof[3],NULL);
418: PetscOptionsTail();
419: return(0);
420: }
422: /*MC
423: DMSTAG = "stag" - A DM object, similar to DMDA, representing a "staggered grid" or a structured cell complex.
425: Level: beginner
427: .seealso: DM, DMPRODUCT, DMDA, DMPLEX, DMStagCreate1d(), DMStagCreate2d(), DMStagCreate3d()
428: M*/
430: PETSC_EXTERN PetscErrorCode DMCreate_Stag(DM dm)
431: {
433: DM_Stag *stag;
434: PetscInt i,dim;
438: PetscNewLog(dm,&stag);
439: dm->data = stag;
441: stag->gtol = NULL;
442: stag->ltog_injective = NULL;
443: for (i=0; i<DMSTAG_MAX_STRATA; ++i) stag->dof[i] = 0;
444: for (i=0; i<DMSTAG_MAX_DIM; ++i) stag->l[i] = NULL;
445: stag->stencilType = DMSTAG_STENCIL_NONE;
446: stag->stencilWidth = 0;
447: for (i=0; i<DMSTAG_MAX_DIM; ++i) stag->nRanks[i] = -1;
448: stag->coordinateDMType = NULL;
450: DMGetDimension(dm,&dim);
452: PetscMemzero(dm->ops,sizeof(*(dm->ops)));
453: dm->ops->createcoordinatedm = DMCreateCoordinateDM_Stag;
454: dm->ops->createglobalvector = DMCreateGlobalVector_Stag;
455: dm->ops->createinterpolation = NULL;
456: dm->ops->createlocalvector = DMCreateLocalVector_Stag;
457: dm->ops->creatematrix = DMCreateMatrix_Stag;
458: dm->ops->destroy = DMDestroy_Stag;
459: dm->ops->getneighbors = DMGetNeighbors_Stag;
460: dm->ops->globaltolocalbegin = DMGlobalToLocalBegin_Stag;
461: dm->ops->globaltolocalend = DMGlobalToLocalEnd_Stag;
462: dm->ops->localtoglobalbegin = DMLocalToGlobalBegin_Stag;
463: dm->ops->localtoglobalend = DMLocalToGlobalEnd_Stag;
464: dm->ops->setfromoptions = DMSetFromOptions_Stag;
465: switch (dim) {
466: case 1: dm->ops->setup = DMSetUp_Stag_1d; break;
467: case 2: dm->ops->setup = DMSetUp_Stag_2d; break;
468: case 3: dm->ops->setup = DMSetUp_Stag_3d; break;
469: default : SETERRQ1(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_OUTOFRANGE,"Unsupported dimension %d",dim);
470: }
471: dm->ops->view = DMView_Stag;
472: dm->ops->getcompatibility = DMGetCompatibility_Stag;
473: return(0);
474: }