1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Demonstrates the use of fast Richardson for SOR. And tests\n\ 3*c4762a1bSJed Brown the MatSOR() routines.\n\n"; 4*c4762a1bSJed Brown 5*c4762a1bSJed Brown #include <petscpc.h> 6*c4762a1bSJed Brown 7*c4762a1bSJed Brown int main(int argc,char **args) 8*c4762a1bSJed Brown { 9*c4762a1bSJed Brown Mat mat; 10*c4762a1bSJed Brown Vec b,u; 11*c4762a1bSJed Brown PC pc; 12*c4762a1bSJed Brown PetscErrorCode ierr; 13*c4762a1bSJed Brown PetscInt n = 5,i,col[3]; 14*c4762a1bSJed Brown PetscScalar value[3]; 15*c4762a1bSJed Brown 16*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 17*c4762a1bSJed Brown /* Create vectors */ 18*c4762a1bSJed Brown ierr = VecCreateSeq(PETSC_COMM_SELF,n,&b);CHKERRQ(ierr); 19*c4762a1bSJed Brown ierr = VecCreateSeq(PETSC_COMM_SELF,n,&u);CHKERRQ(ierr); 20*c4762a1bSJed Brown 21*c4762a1bSJed Brown /* Create and assemble matrix */ 22*c4762a1bSJed Brown ierr = MatCreateSeqDense(PETSC_COMM_SELF,n,n,NULL,&mat);CHKERRQ(ierr); 23*c4762a1bSJed Brown value[0] = -1.0; value[1] = 2.0; value[2] = -1.0; 24*c4762a1bSJed Brown for (i=1; i<n-1; i++) { 25*c4762a1bSJed Brown col[0] = i-1; col[1] = i; col[2] = i+1; 26*c4762a1bSJed Brown ierr = MatSetValues(mat,1,&i,3,col,value,INSERT_VALUES);CHKERRQ(ierr); 27*c4762a1bSJed Brown } 28*c4762a1bSJed Brown i = n - 1; col[0] = n - 2; col[1] = n - 1; 29*c4762a1bSJed Brown ierr = MatSetValues(mat,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr); 30*c4762a1bSJed Brown i = 0; col[0] = 0; col[1] = 1; value[0] = 2.0; value[1] = -1.0; 31*c4762a1bSJed Brown ierr = MatSetValues(mat,1,&i,2,col,value,INSERT_VALUES);CHKERRQ(ierr); 32*c4762a1bSJed Brown ierr = MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 33*c4762a1bSJed Brown ierr = MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 34*c4762a1bSJed Brown 35*c4762a1bSJed Brown /* Create PC context and set up data structures */ 36*c4762a1bSJed Brown ierr = PCCreate(PETSC_COMM_WORLD,&pc);CHKERRQ(ierr); 37*c4762a1bSJed Brown ierr = PCSetType(pc,PCSOR);CHKERRQ(ierr); 38*c4762a1bSJed Brown ierr = PCSetFromOptions(pc);CHKERRQ(ierr); 39*c4762a1bSJed Brown ierr = PCSetOperators(pc,mat,mat);CHKERRQ(ierr); 40*c4762a1bSJed Brown ierr = PCSetUp(pc);CHKERRQ(ierr); 41*c4762a1bSJed Brown 42*c4762a1bSJed Brown value[0] = 1.0; 43*c4762a1bSJed Brown for (i=0; i<n; i++) { 44*c4762a1bSJed Brown ierr = VecSet(u,0.0);CHKERRQ(ierr); 45*c4762a1bSJed Brown ierr = VecSetValues(u,1,&i,value,INSERT_VALUES);CHKERRQ(ierr); 46*c4762a1bSJed Brown ierr = VecAssemblyBegin(u);CHKERRQ(ierr); 47*c4762a1bSJed Brown ierr = VecAssemblyEnd(u);CHKERRQ(ierr); 48*c4762a1bSJed Brown ierr = PCApply(pc,u,b);CHKERRQ(ierr); 49*c4762a1bSJed Brown ierr = VecView(b,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr); 50*c4762a1bSJed Brown } 51*c4762a1bSJed Brown 52*c4762a1bSJed Brown /* Free data structures */ 53*c4762a1bSJed Brown ierr = MatDestroy(&mat);CHKERRQ(ierr); 54*c4762a1bSJed Brown ierr = PCDestroy(&pc);CHKERRQ(ierr); 55*c4762a1bSJed Brown ierr = VecDestroy(&u);CHKERRQ(ierr); 56*c4762a1bSJed Brown ierr = VecDestroy(&b);CHKERRQ(ierr); 57*c4762a1bSJed Brown ierr = PetscFinalize(); 58*c4762a1bSJed Brown return ierr; 59*c4762a1bSJed Brown } 60*c4762a1bSJed Brown 61*c4762a1bSJed Brown /*TEST 62*c4762a1bSJed Brown 63*c4762a1bSJed Brown test: 64*c4762a1bSJed Brown 65*c4762a1bSJed Brown TEST*/ 66*c4762a1bSJed Brown 67*c4762a1bSJed Brown 68