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 PetscFunctionBeginUser; 14 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 15 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 16 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 17 n = 2*size; 18 19 /* create the matrix for the five point stencil, YET AGAIN*/ 20 PetscCall(MatCreate(PETSC_COMM_WORLD,&C)); 21 PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 22 PetscCall(MatSetFromOptions(C)); 23 PetscCall(MatSetUp(C)); 24 for (i=0; i<m; i++) { 25 for (j=2*rank; j<2*rank+2; j++) { 26 v = -1.0; Ii = j + n*i; 27 if (i>0) {J = Ii - n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 28 if (i<m-1) {J = Ii + n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 29 if (j>0) {J = Ii - 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 30 if (j<n-1) {J = Ii + 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 31 v = 4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 32 } 33 } 34 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 35 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 36 for (i=0; i<m; i++) { 37 for (j=2*rank; j<2*rank+2; j++) { 38 v = 1.0; Ii = j + n*i; 39 if (i>0) {J = Ii - n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 40 if (i<m-1) {J = Ii + n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 41 if (j>0) {J = Ii - 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 42 if (j<n-1) {J = Ii + 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 43 v = -4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 44 } 45 } 46 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 47 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 48 49 PetscCall(MatView(C,PETSC_VIEWER_STDOUT_WORLD)); 50 51 PetscCall(MatDestroy(&C)); 52 PetscCall(PetscFinalize()); 53 return 0; 54 } 55 56 /*TEST 57 58 test: 59 60 TEST*/ 61