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 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 17 PetscCheckFalse(size != 1,PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 18 19 CHKERRQ(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON)); 20 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 21 CHKERRQ(PetscOptionsGetBool(NULL,NULL,"-struct_only",&struct_only,NULL)); 22 n = m; 23 24 /* ------- Assemble matrix, test MatValid() --------- */ 25 CHKERRQ(MatCreate(PETSC_COMM_WORLD,&mat)); 26 CHKERRQ(MatSetSizes(mat,PETSC_DECIDE,PETSC_DECIDE,m,n)); 27 CHKERRQ(MatSetFromOptions(mat)); 28 if (struct_only) { 29 CHKERRQ(MatSetOption(mat,MAT_STRUCTURE_ONLY,PETSC_TRUE)); 30 } 31 CHKERRQ(MatSetUp(mat)); 32 CHKERRQ(MatGetOwnershipRange(mat,&rstart,&rend)); 33 for (i=rstart; i<rend; i++) { 34 for (j=0; j<n; j++) { 35 v = 10.0*i+j; 36 CHKERRQ(MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES)); 37 } 38 } 39 CHKERRQ(MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY)); 40 CHKERRQ(MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY)); 41 CHKERRQ(MatView(mat,PETSC_VIEWER_STDOUT_WORLD)); 42 43 /* Free data structures */ 44 CHKERRQ(MatDestroy(&mat)); 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