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*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 14*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 15*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 16c4762a1bSJed Brown 17c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN */ 18*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_SELF,&C)); 19*9566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 20*9566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 21*9566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 22c4762a1bSJed Brown for (i=0; i<m; i++) { 23c4762a1bSJed Brown for (j=0; j<n; j++) { 24c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 25*9566063dSJacob Faibussowitsch if (i>0) {J=Ii-n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 26*9566063dSJacob Faibussowitsch if (i<m-1) {J=Ii+n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 27*9566063dSJacob Faibussowitsch if (j>0) {J=Ii-1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 28*9566063dSJacob Faibussowitsch if (j<n-1) {J=Ii+1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 29*9566063dSJacob Faibussowitsch v = 4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 30c4762a1bSJed Brown } 31c4762a1bSJed Brown } 32*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 33*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 34*9566063dSJacob Faibussowitsch PetscCall(MatView(C,PETSC_VIEWER_STDOUT_SELF)); 35c4762a1bSJed Brown 36*9566063dSJacob Faibussowitsch PetscCall(MatGetInfo(C,MAT_LOCAL,&info)); 37*9566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF,"matrix nonzeros = %" PetscInt_FMT ", allocated nonzeros = %" PetscInt_FMT "\n",(PetscInt)info.nz_used,(PetscInt)info.nz_allocated)); 38c4762a1bSJed Brown 39*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 40*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 41b122ec5aSJacob Faibussowitsch return 0; 42c4762a1bSJed Brown } 43c4762a1bSJed Brown 44c4762a1bSJed Brown /*TEST 45c4762a1bSJed Brown 46c4762a1bSJed Brown test: 47c4762a1bSJed Brown 48c4762a1bSJed Brown TEST*/ 49