1 2 /* 3 Defines matrix-matrix product routines 4 C = A^T * B 5 */ 6 7 #include <../src/mat/impls/aij/seq/aij.h> /*I "petscmat.h" I*/ 8 #include <../src/mat/impls/dense/seq/dense.h> 9 10 PetscErrorCode MatDestroy_SeqDense_MatTransMatMult(Mat A) 11 { 12 PetscErrorCode ierr; 13 Mat_SeqDense *a = (Mat_SeqDense*)A->data; 14 Mat_MatTransMatMult *atb = a->atb; 15 16 PetscFunctionBegin; 17 ierr = MatDestroy(&atb->mA);CHKERRQ(ierr); 18 ierr = VecDestroy(&atb->bt);CHKERRQ(ierr); 19 ierr = VecDestroy(&atb->ct);CHKERRQ(ierr); 20 ierr = (atb->destroy)(A);CHKERRQ(ierr); 21 ierr = PetscFree(atb);CHKERRQ(ierr); 22 PetscFunctionReturn(0); 23 } 24 25 PetscErrorCode MatTransposeMatMultSymbolic_SeqAIJ_SeqDense(Mat A,Mat B,PetscReal fill,Mat C) 26 { 27 PetscErrorCode ierr; 28 PetscInt m=A->rmap->n,n=A->cmap->n,BN=B->cmap->N; 29 Mat_MatTransMatMult *atb; 30 Vec bt,ct; 31 Mat_SeqDense *c; 32 33 PetscFunctionBegin; 34 ierr = PetscNew(&atb);CHKERRQ(ierr); 35 36 /* create output dense matrix C = A^T*B */ 37 ierr = MatSetSizes(C,n,BN,n,BN);CHKERRQ(ierr); 38 ierr = MatSetType(C,MATSEQDENSE);CHKERRQ(ierr); 39 ierr = MatSetUp(C);CHKERRQ(ierr); 40 41 /* create vectors bt and ct to hold locally transposed arrays of B and C */ 42 ierr = VecCreate(PETSC_COMM_SELF,&bt);CHKERRQ(ierr); 43 ierr = VecSetSizes(bt,m*BN,m*BN);CHKERRQ(ierr); 44 ierr = VecSetType(bt,VECSTANDARD);CHKERRQ(ierr); 45 ierr = VecCreate(PETSC_COMM_SELF,&ct);CHKERRQ(ierr); 46 ierr = VecSetSizes(ct,n*BN,n*BN);CHKERRQ(ierr); 47 ierr = VecSetType(ct,VECSTANDARD);CHKERRQ(ierr); 48 atb->bt = bt; 49 atb->ct = ct; 50 51 c = (Mat_SeqDense*)C->data; 52 c->atb = atb; 53 atb->destroy = C->ops->destroy; 54 C->ops->destroy = MatDestroy_SeqDense_MatTransMatMult; 55 C->ops->transposematmultnumeric = MatTransposeMatMultNumeric_SeqAIJ_SeqDense; 56 PetscFunctionReturn(0); 57 } 58 59 PetscErrorCode MatTransposeMatMultNumeric_SeqAIJ_SeqDense(Mat A,Mat B,Mat C) 60 { 61 PetscErrorCode ierr; 62 PetscInt i,j,k,m=A->rmap->n,n=A->cmap->n,BN=B->cmap->N; 63 const PetscScalar *Barray,*ctarray; 64 PetscScalar *Carray,*btarray; 65 Mat_SeqDense *c=(Mat_SeqDense*)C->data; 66 Mat_MatTransMatMult *atb=c->atb; 67 Vec bt=atb->bt,ct=atb->ct; 68 69 PetscFunctionBegin; 70 /* create MAIJ matrix mA from A -- should be done in symbolic phase */ 71 ierr = MatDestroy(&atb->mA);CHKERRQ(ierr); 72 ierr = MatCreateMAIJ(A,BN,&atb->mA);CHKERRQ(ierr); 73 74 /* transpose local arry of B, then copy it to vector bt */ 75 ierr = MatDenseGetArrayRead(B,&Barray);CHKERRQ(ierr); 76 ierr = VecGetArray(bt,&btarray);CHKERRQ(ierr); 77 78 k=0; 79 for (j=0; j<BN; j++) { 80 for (i=0; i<m; i++) btarray[i*BN + j] = Barray[k++]; 81 } 82 ierr = VecRestoreArray(bt,&btarray);CHKERRQ(ierr); 83 ierr = MatDenseRestoreArrayRead(B,&Barray);CHKERRQ(ierr); 84 85 /* compute ct = mA^T * cb */ 86 ierr = MatMultTranspose(atb->mA,bt,ct);CHKERRQ(ierr); 87 88 /* transpose local arry of ct to matrix C */ 89 ierr = MatDenseGetArray(C,&Carray);CHKERRQ(ierr); 90 ierr = VecGetArrayRead(ct,&ctarray);CHKERRQ(ierr); 91 k = 0; 92 for (j=0; j<BN; j++) { 93 for (i=0; i<n; i++) Carray[k++] = ctarray[i*BN + j]; 94 } 95 ierr = VecRestoreArrayRead(ct,&ctarray);CHKERRQ(ierr); 96 ierr = MatDenseRestoreArray(C,&Carray);CHKERRQ(ierr); 97 PetscFunctionReturn(0); 98 } 99