1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests reordering a matrix.\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 = 5,n = 5,Ii,J; 10c4762a1bSJed Brown PetscScalar v; 11c4762a1bSJed Brown IS perm,iperm; 12c4762a1bSJed Brown 13*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 14*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_SELF,&C)); 15*9566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 16*9566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 17*9566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 18c4762a1bSJed Brown 19c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN*/ 20c4762a1bSJed Brown for (i=0; i<m; i++) { 21c4762a1bSJed Brown for (j=0; j<n; j++) { 22c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 23*9566063dSJacob Faibussowitsch if (i>0) {J = Ii - n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 24*9566063dSJacob Faibussowitsch if (i<m-1) {J = Ii + n; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 25*9566063dSJacob Faibussowitsch if (j>0) {J = Ii - 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 26*9566063dSJacob Faibussowitsch if (j<n-1) {J = Ii + 1; PetscCall(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 27*9566063dSJacob Faibussowitsch v = 4.0; PetscCall(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 28c4762a1bSJed Brown } 29c4762a1bSJed Brown } 30*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 31*9566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 32c4762a1bSJed Brown 33*9566063dSJacob Faibussowitsch PetscCall(MatGetOrdering(C,MATORDERINGND,&perm,&iperm)); 34*9566063dSJacob Faibussowitsch PetscCall(ISView(perm,PETSC_VIEWER_STDOUT_SELF)); 35*9566063dSJacob Faibussowitsch PetscCall(ISView(iperm,PETSC_VIEWER_STDOUT_SELF)); 36*9566063dSJacob Faibussowitsch PetscCall(MatView(C,PETSC_VIEWER_STDOUT_SELF)); 37c4762a1bSJed Brown 38*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&perm)); 39*9566063dSJacob Faibussowitsch PetscCall(ISDestroy(&iperm)); 40*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 41*9566063dSJacob 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