1 2 static char help[] = "Tests copying and ordering uniprocessor row-based sparse matrices.\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C,A; 9 PetscInt i,j,m = 5,n = 5,Ii,J; 10 PetscErrorCode ierr; 11 PetscScalar v; 12 IS perm,iperm; 13 14 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 15 ierr = MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,NULL,&C);CHKERRQ(ierr); 16 /* create the matrix for the five point stencil, YET AGAIN*/ 17 for (i=0; i<m; i++) { 18 for (j=0; j<n; j++) { 19 v = -1.0; Ii = j + n*i; 20 if (i>0) {J = Ii - n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 21 if (i<m-1) {J = Ii + n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 22 if (j>0) {J = Ii - 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 23 if (j<n-1) {J = Ii + 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 24 v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 25 } 26 } 27 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 28 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 29 30 ierr = MatConvert(C,MATSAME,MAT_INITIAL_MATRIX,&A);CHKERRQ(ierr); 31 32 ierr = MatGetOrdering(A,MATORDERINGND,&perm,&iperm);CHKERRQ(ierr); 33 ierr = ISView(perm,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 34 ierr = ISView(iperm,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 35 ierr = MatView(A,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 36 37 ierr = ISDestroy(&perm);CHKERRQ(ierr); 38 ierr = ISDestroy(&iperm);CHKERRQ(ierr); 39 ierr = MatDestroy(&C);CHKERRQ(ierr); 40 ierr = MatDestroy(&A);CHKERRQ(ierr); 41 ierr = PetscFinalize(); 42 return ierr; 43 } 44 45 46 /*TEST 47 48 test: 49 filter: grep -v "MPI processes" 50 51 TEST*/ 52