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*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 145f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(PETSC_COMM_SELF,&C)); 155f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 165f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetFromOptions(C)); 175f80ce2aSJacob Faibussowitsch CHKERRQ(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; 235f80ce2aSJacob Faibussowitsch if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 245f80ce2aSJacob Faibussowitsch if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 255f80ce2aSJacob Faibussowitsch if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 265f80ce2aSJacob Faibussowitsch if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 275f80ce2aSJacob Faibussowitsch v = 4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 28c4762a1bSJed Brown } 29c4762a1bSJed Brown } 305f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 315f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 32c4762a1bSJed Brown 335f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOrdering(C,MATORDERINGND,&perm,&iperm)); 345f80ce2aSJacob Faibussowitsch CHKERRQ(ISView(perm,PETSC_VIEWER_STDOUT_SELF)); 355f80ce2aSJacob Faibussowitsch CHKERRQ(ISView(iperm,PETSC_VIEWER_STDOUT_SELF)); 365f80ce2aSJacob Faibussowitsch CHKERRQ(MatView(C,PETSC_VIEWER_STDOUT_SELF)); 37c4762a1bSJed Brown 385f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&perm)); 395f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&iperm)); 405f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 41*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 42*b122ec5aSJacob Faibussowitsch return 0; 43c4762a1bSJed Brown } 44c4762a1bSJed Brown 45c4762a1bSJed Brown /*TEST 46c4762a1bSJed Brown 47c4762a1bSJed Brown test: 48c4762a1bSJed Brown 49c4762a1bSJed Brown TEST*/ 50