Actual source code: ex64.c


  2: static char help[] = "Saves 4by4 block matrix.\n\n";

  4: #include <petscmat.h>

  6: int main(int argc,char **args)
  7: {
  8:   Mat            A;
  9:   PetscInt       i,j;
 10:   PetscMPIInt    size;
 11:   PetscViewer    fd;
 12:   PetscScalar    values[16],one = 1.0;
 13:   Vec            x;

 15:   PetscInitialize(&argc,&args,(char*)0,help);
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 19:   /*
 20:      Open binary file.  Note that we use FILE_MODE_WRITE to indicate
 21:      writing to this file.
 22:   */
 23:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,"4by4",FILE_MODE_WRITE,&fd);

 25:   MatCreateSeqBAIJ(PETSC_COMM_WORLD,4,12,12,0,0,&A);

 27:   for (i=0; i<16; i++) values[i] = i;
 28:   for (i=0; i<4; i++) values[4*i+i] += 5;
 29:   i    = 0; j = 0;
 30:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 32:   for (i=0; i<16; i++) values[i] = i;
 33:   i    = 0; j = 2;
 34:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 36:   for (i=0; i<16; i++) values[i] = i;
 37:   i    = 1; j = 0;
 38:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 40:   for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 6;
 41:   i    = 1; j = 1;
 42:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 44:   for (i=0; i<16; i++) values[i] = i;
 45:   i    = 2; j = 0;
 46:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 48:   for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 7;
 49:   i    = 2; j = 2;
 50:   MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);

 52:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 53:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 54:   MatView(A,fd);
 55:   MatDestroy(&A);

 57:   VecCreateSeq(PETSC_COMM_WORLD,12,&x);
 58:   VecSet(x,one);
 59:   VecView(x,fd);
 60:   VecDestroy(&x);

 62:   PetscViewerDestroy(&fd);
 63:   PetscFinalize();
 64:   return 0;
 65: }