Actual source code: transm.c
petsc-3.7.1 2016-05-15
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      2: #include <petsc/private/matimpl.h>          /*I "petscmat.h" I*/

      4: typedef struct {
      5:   Mat A;
      6: } Mat_Transpose;

     10: PetscErrorCode MatMult_Transpose(Mat N,Vec x,Vec y)
     11: {
     12:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     16:   MatMultTranspose(Na->A,x,y);
     17:   return(0);
     18: }

     22: PetscErrorCode MatMultAdd_Transpose(Mat N,Vec v1,Vec v2,Vec v3)
     23: {
     24:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     28:   MatMultTransposeAdd(Na->A,v1,v2,v3);
     29:   return(0);
     30: }

     34: PetscErrorCode MatMultTranspose_Transpose(Mat N,Vec x,Vec y)
     35: {
     36:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     40:   MatMult(Na->A,x,y);
     41:   return(0);
     42: }

     46: PetscErrorCode MatMultTransposeAdd_Transpose(Mat N,Vec v1,Vec v2,Vec v3)
     47: {
     48:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     52:   MatMultAdd(Na->A,v1,v2,v3);
     53:   return(0);
     54: }

     58: PetscErrorCode MatDestroy_Transpose(Mat N)
     59: {
     60:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     64:   MatDestroy(&Na->A);
     65:   PetscFree(N->data);
     66:   return(0);
     67: }

     71: PetscErrorCode MatDuplicate_Transpose(Mat N, MatDuplicateOption op, Mat* m)
     72: {
     73:   Mat_Transpose  *Na = (Mat_Transpose*)N->data;

     77:   if (op == MAT_COPY_VALUES) {
     78:     MatTranspose(Na->A,MAT_INITIAL_MATRIX,m);
     79:   } else if (op == MAT_DO_NOT_COPY_VALUES) {
     80:     MatDuplicate(Na->A,MAT_DO_NOT_COPY_VALUES,m);
     81:     MatTranspose(*m,MAT_REUSE_MATRIX,m);
     82:   } else SETERRQ(PetscObjectComm((PetscObject)N),PETSC_ERR_SUP,"MAT_SHARE_NONZERO_PATTERN not supported for this matrix type");
     83:   return(0);
     84: }

     89: /*@
     90:       MatCreateTranspose - Creates a new matrix object that behaves like A'

     92:    Collective on Mat

     94:    Input Parameter:
     95: .   A  - the (possibly rectangular) matrix

     97:    Output Parameter:
     98: .   N - the matrix that represents A'

    100:    Level: intermediate

    102:    Notes: The transpose A' is NOT actually formed! Rather the new matrix
    103:           object performs the matrix-vector product by using the MatMultTranspose() on
    104:           the original matrix

    106: .seealso: MatCreateNormal(), MatMult(), MatMultTranspose(), MatCreate()

    108: @*/
    109: PetscErrorCode  MatCreateTranspose(Mat A,Mat *N)
    110: {
    112:   PetscInt       m,n;
    113:   Mat_Transpose  *Na;

    116:   MatGetLocalSize(A,&m,&n);
    117:   MatCreate(PetscObjectComm((PetscObject)A),N);
    118:   MatSetSizes(*N,n,m,PETSC_DECIDE,PETSC_DECIDE);
    119:   PetscLayoutSetUp((*N)->rmap);
    120:   PetscLayoutSetUp((*N)->cmap);
    121:   PetscObjectChangeTypeName((PetscObject)*N,MATTRANSPOSEMAT);

    123:   PetscNewLog(*N,&Na);
    124:   (*N)->data = (void*) Na;
    125:   PetscObjectReference((PetscObject)A);
    126:   Na->A      = A;

    128:   (*N)->ops->destroy          = MatDestroy_Transpose;
    129:   (*N)->ops->mult             = MatMult_Transpose;
    130:   (*N)->ops->multadd          = MatMultAdd_Transpose;
    131:   (*N)->ops->multtranspose    = MatMultTranspose_Transpose;
    132:   (*N)->ops->multtransposeadd = MatMultTransposeAdd_Transpose;
    133:   (*N)->ops->duplicate        = MatDuplicate_Transpose;
    134:   (*N)->assembled             = PETSC_TRUE;

    136:   MatSetBlockSizes(*N,PetscAbs(A->cmap->bs),PetscAbs(A->rmap->bs));
    137:   MatSetUp(*N);
    138:   return(0);
    139: }