1 2 static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **argv) 7 { 8 Mat mat; 9 PetscInt m = 7,n,i,j,rstart,rend; 10 PetscErrorCode ierr; 11 PetscMPIInt size; 12 PetscScalar v; 13 PetscBool struct_only=PETSC_TRUE; 14 15 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 16 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 17 if (size != 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 18 19 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);CHKERRQ(ierr); 20 ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 21 ierr = PetscOptionsGetBool(NULL,NULL,"-struct_only",&struct_only,NULL);CHKERRQ(ierr); 22 n = m; 23 24 /* ------- Assemble matrix, test MatValid() --------- */ 25 ierr = MatCreate(PETSC_COMM_WORLD,&mat);CHKERRQ(ierr); 26 ierr = MatSetSizes(mat,PETSC_DECIDE,PETSC_DECIDE,m,n);CHKERRQ(ierr); 27 ierr = MatSetFromOptions(mat);CHKERRQ(ierr); 28 if (struct_only) { 29 ierr = MatSetOption(mat,MAT_STRUCTURE_ONLY,PETSC_TRUE);CHKERRQ(ierr); 30 } 31 ierr = MatSetUp(mat);CHKERRQ(ierr); 32 ierr = MatGetOwnershipRange(mat,&rstart,&rend);CHKERRQ(ierr); 33 for (i=rstart; i<rend; i++) { 34 for (j=0; j<n; j++) { 35 v = 10.0*i+j; 36 ierr = MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 37 } 38 } 39 ierr = MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 40 ierr = MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 41 ierr = MatView(mat,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 42 43 /* Free data structures */ 44 ierr = MatDestroy(&mat);CHKERRQ(ierr); 45 ierr = PetscFinalize(); 46 return ierr; 47 } 48 49 /*TEST 50 51 test: 52 output_file: output/ex107.out 53 54 test: 55 suffix: 2 56 args: -mat_type baij -mat_block_size 2 -m 10 57 58 TEST*/ 59