1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests automatic allocation of matrix storage space.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat C; 9c4762a1bSJed Brown PetscInt i,j,m = 3,n = 3,Ii,J; 10c4762a1bSJed Brown PetscScalar v; 11c4762a1bSJed Brown MatInfo info; 12c4762a1bSJed Brown 13*327415f7SBarry Smith PetscFunctionBeginUser; 149566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 159566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 169566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 17c4762a1bSJed Brown 18c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN */ 199566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_SELF,&C)); 209566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 219566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 229566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 23c4762a1bSJed Brown for (i=0; i<m; i++) { 24c4762a1bSJed Brown for (j=0; j<n; j++) { 25c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 269566063dSJacob Faibussowitsch if (i>0) {J=Ii-n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 279566063dSJacob Faibussowitsch if (i<m-1) {J=Ii+n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 289566063dSJacob Faibussowitsch if (j>0) {J=Ii-1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 299566063dSJacob Faibussowitsch if (j<n-1) {J=Ii+1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 309566063dSJacob Faibussowitsch v = 4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 31c4762a1bSJed Brown } 32c4762a1bSJed Brown } 339566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 349566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 359566063dSJacob Faibussowitsch PetscCall(MatView(C,PETSC_VIEWER_STDOUT_SELF)); 36c4762a1bSJed Brown 379566063dSJacob Faibussowitsch PetscCall(MatGetInfo(C,MAT_LOCAL,&info)); 389566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"matrix nonzeros = %" PetscInt_FMT ", allocated nonzeros = %" PetscInt_FMT "\n",(PetscInt)info.nz_used,(PetscInt)info.nz_allocated)); 39c4762a1bSJed Brown 409566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 419566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 42b122ec5aSJacob Faibussowitsch return 0; 43c4762a1bSJed Brown } 44c4762a1bSJed Brown 45c4762a1bSJed Brown /*TEST 46c4762a1bSJed Brown 47c4762a1bSJed Brown test: 48c4762a1bSJed Brown 49c4762a1bSJed Brown TEST*/ 50