1 static char help[] = "Tests MatShift for SeqAIJ matrices with some missing diagonal entries\n\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc,char **argv) 6 { 7 Mat A; 8 PetscInt coli[4],row; 9 PetscScalar vali[4]; 10 PetscErrorCode ierr; 11 PetscMPIInt size; 12 13 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 14 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 15 if (size != 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 16 17 ierr = MatCreate(PETSC_COMM_SELF,&A);CHKERRQ(ierr); 18 ierr = MatSetSizes(A,4,4,4,4);CHKERRQ(ierr); 19 ierr = MatSetType(A,MATSEQAIJ);CHKERRQ(ierr); 20 ierr = MatSeqAIJSetPreallocation(A,4,NULL);CHKERRQ(ierr); 21 22 row = 0; coli[0] = 1; coli[1] = 3; vali[0] = 1.0; vali[1] = 2.0; 23 ierr = MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES);CHKERRQ(ierr); 24 25 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; 26 ierr = MatSetValues(A,1,&row,4,coli,vali,ADD_VALUES);CHKERRQ(ierr); 27 28 row = 2; coli[0] = 0; coli[1] = 3; vali[0] = 7.0; vali[1] = 8.0; 29 ierr = MatSetValues(A,1,&row,2,coli,vali,ADD_VALUES);CHKERRQ(ierr); 30 31 ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 32 ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 33 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 34 35 ierr = MatShift(A,0.0);CHKERRQ(ierr); 36 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 37 38 ierr = MatDestroy(&A);CHKERRQ(ierr); 39 ierr = PetscFinalize(); 40 return ierr; 41 } 42 43 /*TEST 44 45 test: 46 47 TEST*/ 48