Actual source code: gcreate.c

  1: #define PETSCMAT_DLL

 3:  #include include/private/matimpl.h
 4:  #include petscsys.h

  8: static PetscErrorCode MatPublish_Base(PetscObject obj)
  9: {
 11:   return(0);
 12: }


 17: /*@
 18:    MatCreate - Creates a matrix where the type is determined
 19:    from either a call to MatSetType() or from the options database
 20:    with a call to MatSetFromOptions(). The default matrix type is
 21:    AIJ, using the routines MatCreateSeqAIJ() or MatCreateMPIAIJ()
 22:    if you do not set a type in the options database. If you never
 23:    call MatSetType() or MatSetFromOptions() it will generate an 
 24:    error when you try to use the matrix.

 26:    Collective on MPI_Comm

 28:    Input Parameter:
 29: .  comm - MPI communicator
 30:  
 31:    Output Parameter:
 32: .  A - the matrix

 34:    Options Database Keys:
 35: +    -mat_type seqaij   - AIJ type, uses MatCreateSeqAIJ()
 36: .    -mat_type mpiaij   - AIJ type, uses MatCreateMPIAIJ()
 37: .    -mat_type seqbdiag - block diagonal type, uses MatCreateSeqBDiag()
 38: .    -mat_type mpibdiag - block diagonal type, uses MatCreateMPIBDiag()
 39: .    -mat_type mpirowbs - rowbs type, uses MatCreateMPIRowbs()
 40: .    -mat_type seqdense - dense type, uses MatCreateSeqDense()
 41: .    -mat_type mpidense - dense type, uses MatCreateMPIDense()
 42: .    -mat_type seqbaij  - block AIJ type, uses MatCreateSeqBAIJ()
 43: -    -mat_type mpibaij  - block AIJ type, uses MatCreateMPIBAIJ()

 45:    Even More Options Database Keys:
 46:    See the manpages for particular formats (e.g., MatCreateSeqAIJ())
 47:    for additional format-specific options.

 49:    Notes:

 51:    Level: beginner

 53:    User manual sections:
 54: +   Section 3.1 Creating and Assembling Matrices
 55: -   Chapter 3 Matrices

 57: .keywords: matrix, create

 59: .seealso: MatCreateSeqAIJ(), MatCreateMPIAIJ(), 
 60:           MatCreateSeqBDiag(),MatCreateMPIBDiag(),
 61:           MatCreateSeqDense(), MatCreateMPIDense(), 
 62:           MatCreateMPIRowbs(), MatCreateSeqBAIJ(), MatCreateMPIBAIJ(),
 63:           MatCreateSeqSBAIJ(), MatCreateMPISBAIJ(),
 64:           MatConvert()
 65: @*/
 66: PetscErrorCode  MatCreate(MPI_Comm comm,Mat *A)
 67: {
 68:   Mat            B;


 74:   *A = PETSC_NULL;
 75: #ifndef PETSC_USE_DYNAMIC_LIBRARIES
 76:   MatInitializePackage(PETSC_NULL);
 77: #endif

 79:   PetscHeaderCreate(B,_p_Mat,struct _MatOps,MAT_COOKIE,0,"Mat",comm,MatDestroy,MatView);
 80:   PetscMapInitialize(comm,&B->rmap);
 81:   PetscMapInitialize(comm,&B->cmap);
 82:   B->preallocated  = PETSC_FALSE;
 83:   B->bops->publish = MatPublish_Base;
 84:   *A               = B;
 85:   return(0);
 86: }

 90: /*@
 91:   MatSetSizes - Sets the local and global sizes, and checks to determine compatibility

 93:   Collective on Mat

 95:   Input Parameters:
 96: +  A - the matrix
 97: .  m - number of local rows (or PETSC_DECIDE)
 98: .  n - number of local columns (or PETSC_DECIDE)
 99: .  M - number of global rows (or PETSC_DETERMINE)
100: -  N - number of global columns (or PETSC_DETERMINE)

102:    Notes:
103:    m (n) and M (N) cannot be both PETSC_DECIDE
104:    If one processor calls this with M (N) of PETSC_DECIDE then all processors must, otherwise the program will hang.

106:    If PETSC_DECIDE is not used for the arguments 'm' and 'n', then the
107:    user must ensure that they are chosen to be compatible with the
108:    vectors. To do this, one first considers the matrix-vector product 
109:    'y = A x'. The 'm' that is used in the above routine must match the 
110:    local size used in the vector creation routine VecCreateMPI() for 'y'.
111:    Likewise, the 'n' used must match that used as the local size in
112:    VecCreateMPI() for 'x'.

114:   Level: beginner

116: .seealso: MatGetSize(), PetscSplitOwnership()
117: @*/
118: PetscErrorCode  MatSetSizes(Mat A, PetscInt m, PetscInt n, PetscInt M, PetscInt N)
119: {

124:   if (M > 0 && m > M) SETERRQ2(PETSC_ERR_ARG_INCOMP,"Local column size %D cannot be larger than global column size %D",m,M);
125:   if (N > 0 && n > N) SETERRQ2(PETSC_ERR_ARG_INCOMP,"Local row size %D cannot be larger than global row size %D",n,N);
126:   if (A->ops->setsizes) {
127:     /* Since this will not be set until the type has been set, this will NOT be called on the initial
128:        call of MatSetSizes() (which must be called BEFORE MatSetType() */
129:     (*A->ops->setsizes)(A,m,n,M,N);
130:   } else {
131:     if ((A->rmap.n >= 0 || A->rmap.N >= 0) && (A->rmap.n != m || A->rmap.N != M)) SETERRQ4(PETSC_ERR_SUP,"Cannot change/reset row sizes to %D local %D global after previously setting them to %D local %D global",m,M,A->rmap.n,A->rmap.N);
132:     if ((A->cmap.n >= 0 || A->cmap.N >= 0) && (A->cmap.n != n || A->cmap.N != N)) SETERRQ4(PETSC_ERR_SUP,"Cannot change/reset column sizes to %D local %D global after previously setting them to %D local %D global",n,N,A->cmap.n,A->cmap.N);
133:   }
134:   A->rmap.n = m;
135:   A->cmap.n = n;
136:   A->rmap.N = M;
137:   A->cmap.N = N;
138:   return(0);
139: }

143: /*@
144:    MatSetFromOptions - Creates a matrix where the type is determined
145:    from the options database. Generates a parallel MPI matrix if the
146:    communicator has more than one processor.  The default matrix type is
147:    AIJ, using the routines MatCreateSeqAIJ() and MatCreateMPIAIJ() if
148:    you do not select a type in the options database.

150:    Collective on Mat

152:    Input Parameter:
153: .  A - the matrix

155:    Options Database Keys:
156: +    -mat_type seqaij   - AIJ type, uses MatCreateSeqAIJ()
157: .    -mat_type mpiaij   - AIJ type, uses MatCreateMPIAIJ()
158: .    -mat_type seqbdiag - block diagonal type, uses MatCreateSeqBDiag()
159: .    -mat_type mpibdiag - block diagonal type, uses MatCreateMPIBDiag()
160: .    -mat_type mpirowbs - rowbs type, uses MatCreateMPIRowbs()
161: .    -mat_type seqdense - dense type, uses MatCreateSeqDense()
162: .    -mat_type mpidense - dense type, uses MatCreateMPIDense()
163: .    -mat_type seqbaij  - block AIJ type, uses MatCreateSeqBAIJ()
164: -    -mat_type mpibaij  - block AIJ type, uses MatCreateMPIBAIJ()

166:    Even More Options Database Keys:
167:    See the manpages for particular formats (e.g., MatCreateSeqAIJ())
168:    for additional format-specific options.

170:    Level: beginner

172: .keywords: matrix, create

174: .seealso: MatCreateSeqAIJ((), MatCreateMPIAIJ(), 
175:           MatCreateSeqBDiag(),MatCreateMPIBDiag(),
176:           MatCreateSeqDense(), MatCreateMPIDense(), 
177:           MatCreateMPIRowbs(), MatCreateSeqBAIJ(), MatCreateMPIBAIJ(),
178:           MatCreateSeqSBAIJ(), MatCreateMPISBAIJ(),
179:           MatConvert()
180: @*/
181: PetscErrorCode  MatSetFromOptions(Mat B)
182: {
184:   char           mtype[256];
185:   PetscTruth     flg;

188:   PetscOptionsGetString(B->prefix,"-mat_type",mtype,256,&flg);
189:   if (flg) {
190:     MatSetType(B,mtype);
191:   }
192:   if (!B->type_name) {
193:     MatSetType(B,MATAIJ);
194:   }
195:   return(0);
196: }

200: /*@C
201:    MatSetUpPreallocation

203:    Collective on Mat

205:    Input Parameter:
206: .  A - the matrix

208:    Level: beginner

210: .keywords: matrix, create

212: .seealso: MatCreateSeqAIJ((), MatCreateMPIAIJ(), 
213:           MatCreateSeqBDiag(),MatCreateMPIBDiag(),
214:           MatCreateSeqDense(), MatCreateMPIDense(), 
215:           MatCreateMPIRowbs(), MatCreateSeqBAIJ(), MatCreateMPIBAIJ(),
216:           MatCreateSeqSBAIJ(), MatCreateMPISBAIJ(),
217:           MatConvert()
218: @*/
219: PetscErrorCode  MatSetUpPreallocation(Mat B)
220: {

224:   if (!B->preallocated && B->ops->setuppreallocation) {
225:     PetscInfo(B,"Warning not preallocating matrix storage\n");
226:     (*B->ops->setuppreallocation)(B);
227:   }
228:   B->preallocated = PETSC_TRUE;
229:   return(0);
230: }

232: /*
233:         Copies from Cs header to A
234: */
237: PetscErrorCode MatHeaderCopy(Mat A,Mat C)
238: {
240:   PetscInt       refct;
241:   PetscOps       *Abops;
242:   MatOps         Aops;
243:   char           *mtype,*mname;
244:   void           *spptr;

247:   /* save the parts of A we need */
248:   Abops = A->bops;
249:   Aops  = A->ops;
250:   refct = A->refct;
251:   mtype = A->type_name; A->type_name = 0;
252:   mname = A->name; A->name = 0;
253:   spptr = A->spptr;

255:   /* free all the interior data structures from mat */
256:   (*A->ops->destroy)(A);

258:   PetscFree(C->spptr);

260:   PetscFree(A->rmap.range);
261:   PetscFree(A->cmap.range);

263:   /* copy C over to A */
264:   PetscMemcpy(A,C,sizeof(struct _p_Mat));

266:   /* return the parts of A we saved */
267:   A->bops      = Abops;
268:   A->ops       = Aops;
269:   A->qlist     = 0;
270:   A->refct     = refct;
271:   A->type_name = mtype;
272:   A->name      = mname;
273:   A->spptr     = spptr;

275:   PetscHeaderDestroy(C);
276:   return(0);
277: }
278: /*
279:         Replace A's header with that of C
280:         This is essentially code moved from MatDestroy
281: */
284: PetscErrorCode MatHeaderReplace(Mat A,Mat C)
285: {

289:   /* free all the interior data structures from mat */
290:   (*A->ops->destroy)(A);
291:   PetscHeaderDestroy_Private((PetscObject)A);
292:   PetscFree(A->rmap.range);
293:   PetscFree(A->cmap.range);
294:   PetscFree(A->spptr);
295: 
296:   /* copy C over to A */
297:   if (C) {
298:     PetscMemcpy(A,C,sizeof(struct _p_Mat));
299:     PetscLogObjectDestroy((PetscObject)C);
300:     PetscFree(C);
301:   }
302:   return(0);
303: }