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*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 145f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL)); 155f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 16c4762a1bSJed Brown 17c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN */ 185f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(PETSC_COMM_SELF,&C)); 195f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 205f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetFromOptions(C)); 215f80ce2aSJacob Faibussowitsch CHKERRQ(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; 255f80ce2aSJacob Faibussowitsch if (i>0) {J=Ii-n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 265f80ce2aSJacob Faibussowitsch if (i<m-1) {J=Ii+n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 275f80ce2aSJacob Faibussowitsch if (j>0) {J=Ii-1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 285f80ce2aSJacob Faibussowitsch if (j<n-1) {J=Ii+1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 295f80ce2aSJacob Faibussowitsch v = 4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 30c4762a1bSJed Brown } 31c4762a1bSJed Brown } 325f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 335f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 345f80ce2aSJacob Faibussowitsch CHKERRQ(MatView(C,PETSC_VIEWER_STDOUT_SELF)); 35c4762a1bSJed Brown 365f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetInfo(C,MAT_LOCAL,&info)); 375f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"matrix nonzeros = %" PetscInt_FMT ", allocated nonzeros = %" PetscInt_FMT "\n",(PetscInt)info.nz_used,(PetscInt)info.nz_allocated)); 38c4762a1bSJed Brown 395f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 40*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 41*b122ec5aSJacob Faibussowitsch return 0; 42c4762a1bSJed Brown } 43c4762a1bSJed Brown 44c4762a1bSJed Brown /*TEST 45c4762a1bSJed Brown 46c4762a1bSJed Brown test: 47c4762a1bSJed Brown 48c4762a1bSJed Brown TEST*/ 49