1 2 static char help[] = "Tests repeated use of assembly for matrices.\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C; 9 PetscInt i,j,m = 5,n = 2,Ii,J; 10 PetscMPIInt rank,size; 11 PetscScalar v; 12 13 CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 14 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 15 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 16 n = 2*size; 17 18 /* create the matrix for the five point stencil, YET AGAIN*/ 19 CHKERRQ(MatCreate(PETSC_COMM_WORLD,&C)); 20 CHKERRQ(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 21 CHKERRQ(MatSetFromOptions(C)); 22 CHKERRQ(MatSetUp(C)); 23 for (i=0; i<m; i++) { 24 for (j=2*rank; j<2*rank+2; j++) { 25 v = -1.0; Ii = j + n*i; 26 if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 27 if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 28 if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 29 if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 30 v = 4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 31 } 32 } 33 CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 34 CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 35 for (i=0; i<m; i++) { 36 for (j=2*rank; j<2*rank+2; j++) { 37 v = 1.0; Ii = j + n*i; 38 if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 39 if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 40 if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 41 if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 42 v = -4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 43 } 44 } 45 CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 46 CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 47 48 CHKERRQ(MatView(C,PETSC_VIEWER_STDOUT_WORLD)); 49 50 CHKERRQ(MatDestroy(&C)); 51 CHKERRQ(PetscFinalize()); 52 return 0; 53 } 54 55 /*TEST 56 57 test: 58 59 TEST*/ 60