1: static char help[] = "Basic test of various routines with SBAIJ matrices\n\n";

  3:  #include <petscmat.h>

  5: int main(int argc,char **argv)
  6: {
  8:   PetscInt       ia[3]={0,2,4};
  9:   PetscInt       ja[4]={0,1,0,1};
 10:   PetscScalar    c[16]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
 11:   PetscMPIInt    size;
 12:   Mat            ssbaij,msbaij;
 13:   Vec            x,y;

 15:   PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr;
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 17:   if (size != 2) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is an example with two processors only!");
 18:   MatCreate(PETSC_COMM_SELF,&ssbaij);
 19:   MatSetType(ssbaij,MATSEQSBAIJ);
 20:   MatSetBlockSize(ssbaij,2);
 21:   MatSetSizes(ssbaij,4,8,4,8);
 22:   MatSeqSBAIJSetPreallocationCSR(ssbaij,2,ia,ja,c);
 23:   MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,ssbaij,PETSC_DECIDE,MAT_INITIAL_MATRIX,&msbaij);
 24:   MatView(msbaij,PETSC_VIEWER_STDOUT_WORLD);
 25:   MatDestroy(&msbaij);
 26:   MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,ssbaij,4,MAT_INITIAL_MATRIX,&msbaij);
 27:   MatView(msbaij,PETSC_VIEWER_STDOUT_WORLD);
 28:   MatCreateVecs(msbaij,&x,&y);
 29:   VecSet(x,1);
 30:   MatMult(msbaij,x,y);
 31:   VecView(y,PETSC_VIEWER_STDOUT_WORLD);
 32:   MatMultAdd(msbaij,x,x,y);
 33:   VecView(y,PETSC_VIEWER_STDOUT_WORLD);
 34:   MatGetDiagonal(msbaij,y);
 35:   VecView(y,PETSC_VIEWER_STDOUT_WORLD);
 36:   VecDestroy(&x);
 37:   VecDestroy(&y);
 38:   MatDestroy(&msbaij);
 39:   MatDestroy(&ssbaij);
 40:   PetscFinalize();
 41:   return ierr;
 42: }

 44: /*TEST

 46:    test:
 47:      nsize: 2
 48:      filter: sed "s?\.??g"

 50: TEST*/