Actual source code: ex61.c

  1: /*$Id: ex61.c,v 1.13 2001/08/07 03:03:07 balay Exp $*/

  3: static char help[] = "Tests MatSeq(B)AIJSetColumnIndices().nn";

 5:  #include petscmat.h

  7: /*
  8:       Generate the following matrix:

 10:          1 0 3 
 11:          1 2 3
 12:          0 0 3
 13: */
 14: int main(int argc,char **args)
 15: {
 16:   Mat         A;
 17:   PetscScalar v;
 18:   int         ierr,i,j,rowlens[] = {2,3,1},cols[] = {0,2,0,1,2,2};
 19:   PetscTruth  flg;

 21:   PetscInitialize(&argc,&args,(char *)0,help);

 23:   PetscOptionsHasName(PETSC_NULL,"-baij",&flg);
 24:   if (flg) {
 25:     MatCreateSeqBAIJ(PETSC_COMM_WORLD,1,3,3,PETSC_NULL,rowlens,&A);
 26:     MatSeqBAIJSetColumnIndices(A,cols);
 27:   } else {
 28:     MatCreateSeqAIJ(PETSC_COMM_WORLD,3,3,PETSC_NULL,rowlens,&A);
 29:     MatSeqAIJSetColumnIndices(A,cols);
 30:   }

 32:   i = 0; j = 0; v = 1.0;
 33:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);
 34:   i = 0; j = 2; v = 3.0;
 35:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);

 37:   i = 1; j = 0; v = 1.0;
 38:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);
 39:   i = 1; j = 1; v = 2.0;
 40:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);
 41:   i = 1; j = 2; v = 3.0;
 42:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);

 44:   i = 2; j = 2; v = 3.0;
 45:   MatSetValues(A,1,&i,1,&j,&v,INSERT_VALUES);

 47:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 48:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 49:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 51:   MatDestroy(A);
 52:   PetscFinalize();
 53:   return 0;
 54: }