Actual source code: ex162.c

  1: static char help[] = "Tests MatShift for SeqAIJ matrices with some missing diagonal entries\n\n";

  3: #include <petscmat.h>

  5: int main(int argc,char **argv)
  6: {
  7:   Mat                  A;
  8:   PetscInt             coli[4],row;
  9:   PetscScalar          vali[4];
 10:   PetscMPIInt          size;

 12:   PetscInitialize(&argc,&argv,(char*)0,help);
 13:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 16:   MatCreate(PETSC_COMM_SELF,&A);
 17:   MatSetSizes(A,4,4,4,4);
 18:   MatSetType(A,MATSEQAIJ);
 19:   MatSeqAIJSetPreallocation(A,4,NULL);

 21:   row = 0; coli[0] = 1; coli[1] = 3; vali[0] = 1.0; vali[1] = 2.0;
 22:   MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES);

 24:   row = 1; coli[0] = 0; coli[1] = 1; coli[2] = 2; coli[3] = 3; vali[0] = 3.0; vali[1] = 4.0; vali[2] = 5.0; vali[3] = 6.0;
 25:   MatSetValues(A,1,&row,4,coli,vali,ADD_VALUES);

 27:   row = 2; coli[0] = 0; coli[1] = 3; vali[0] = 7.0; vali[1] = 8.0;
 28:   MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES);

 30:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 31:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 32:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 34:   MatShift(A,0.0);
 35:   MatView(A,PETSC_VIEWER_STDOUT_WORLD);

 37:   MatDestroy(&A);
 38:   PetscFinalize();
 39:   return 0;
 40: }

 42: /*TEST

 44:    test:

 46: TEST*/