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