Actual source code: dspai.c


  2: #include <petscmat.h>
  3: #include <petsc/private/petscimpl.h>

  5: /*
  6:      MatDumpSPAI - Dumps a PETSc matrix to a file in an ASCII format
  7:   suitable for the SPAI code of Stephen Barnard to solve. This routine
  8:   is simply here to allow testing of matrices directly with the SPAI
  9:   code, rather then through the PETSc interface.

 11: */
 12: PetscErrorCode  MatDumpSPAI(Mat A,FILE *file)
 13: {
 14:   const PetscScalar *vals;
 15:   int               i,j,n,size,nz;
 16:   const int         *cols;
 17:   MPI_Comm          comm;

 19:   PetscObjectGetComm((PetscObject)A,&comm);
 20:   MPI_Comm_size(comm,&size);
 22:   MatGetSize(A,&n,&n);
 23:   /* print the matrix */
 24:   fprintf(file,"%d\n",n);
 25:   for (i=0; i<n; i++) {
 26:     MatGetRow(A,i,&nz,&cols,&vals);
 27:     for (j=0; j<nz; j++) fprintf(file,"%d %d %16.14e\n",i+1,cols[j]+1,vals[j]);
 28:     MatRestoreRow(A,i,&nz,&cols,&vals);
 29:   }
 30:   return 0;
 31: }

 33: PetscErrorCode  VecDumpSPAI(Vec b,FILE *file)
 34: {
 35:   int          n,i;
 36:   PetscScalar *array;

 38:   VecGetSize(b,&n);
 39:   VecGetArray(b,&array);
 40:   fprintf(file,"%d\n",n);
 41:   for (i=0; i<n; i++) fprintf(file,"%d %16.14e\n",i+1,array[i]);
 42:   return 0;
 43: }