1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Tests reordering a matrix.\n\n"; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown #include <petscmat.h> 5*c4762a1bSJed Brown 6*c4762a1bSJed Brown int main(int argc,char **args) 7*c4762a1bSJed Brown { 8*c4762a1bSJed Brown Mat C; 9*c4762a1bSJed Brown PetscInt i,j,m = 5,n = 5,Ii,J; 10*c4762a1bSJed Brown PetscErrorCode ierr; 11*c4762a1bSJed Brown PetscScalar v; 12*c4762a1bSJed Brown IS perm,iperm; 13*c4762a1bSJed Brown 14*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 15*c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_SELF,&C);CHKERRQ(ierr); 16*c4762a1bSJed Brown ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 17*c4762a1bSJed Brown ierr = MatSetFromOptions(C);CHKERRQ(ierr); 18*c4762a1bSJed Brown ierr = MatSetUp(C);CHKERRQ(ierr); 19*c4762a1bSJed Brown 20*c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN*/ 21*c4762a1bSJed Brown for (i=0; i<m; i++) { 22*c4762a1bSJed Brown for (j=0; j<n; j++) { 23*c4762a1bSJed Brown v = -1.0; Ii = j + n*i; 24*c4762a1bSJed Brown if (i>0) {J = Ii - n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 25*c4762a1bSJed Brown if (i<m-1) {J = Ii + n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 26*c4762a1bSJed Brown if (j>0) {J = Ii - 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 27*c4762a1bSJed Brown if (j<n-1) {J = Ii + 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 28*c4762a1bSJed Brown v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 29*c4762a1bSJed Brown } 30*c4762a1bSJed Brown } 31*c4762a1bSJed Brown ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 32*c4762a1bSJed Brown ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 33*c4762a1bSJed Brown 34*c4762a1bSJed Brown ierr = MatGetOrdering(C,MATORDERINGND,&perm,&iperm);CHKERRQ(ierr); 35*c4762a1bSJed Brown ierr = ISView(perm,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 36*c4762a1bSJed Brown ierr = ISView(iperm,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 37*c4762a1bSJed Brown ierr = MatView(C,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 38*c4762a1bSJed Brown 39*c4762a1bSJed Brown ierr = ISDestroy(&perm);CHKERRQ(ierr); 40*c4762a1bSJed Brown ierr = ISDestroy(&iperm);CHKERRQ(ierr); 41*c4762a1bSJed Brown ierr = MatDestroy(&C);CHKERRQ(ierr); 42*c4762a1bSJed Brown ierr = PetscFinalize(); 43*c4762a1bSJed Brown return ierr; 44*c4762a1bSJed Brown } 45*c4762a1bSJed Brown 46*c4762a1bSJed Brown 47*c4762a1bSJed Brown /*TEST 48*c4762a1bSJed Brown 49*c4762a1bSJed Brown test: 50*c4762a1bSJed Brown 51*c4762a1bSJed Brown TEST*/ 52