1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests relaxation for dense matrices.\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 Vec u,x,b,e; 10c4762a1bSJed Brown PetscInt i,n = 10,midx[3]; 11c4762a1bSJed Brown PetscErrorCode ierr; 12c4762a1bSJed Brown PetscScalar v[3]; 13c4762a1bSJed Brown PetscReal omega = 1.0,norm; 14c4762a1bSJed Brown 15c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 16*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetReal(NULL,NULL,"-omega",&omega,NULL)); 17*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 18c4762a1bSJed Brown 19*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(PETSC_COMM_SELF,&C)); 20*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(C,n,n,n,n)); 21*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetType(C,MATSEQDENSE)); 22*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetUp(C)); 23*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&b)); 24*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&x)); 25*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&u)); 26*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&e)); 27*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(u,1.0)); 28*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(x,0.0)); 29c4762a1bSJed Brown 30c4762a1bSJed Brown v[0] = -1.; v[1] = 2.; v[2] = -1.; 31c4762a1bSJed Brown for (i=1; i<n-1; i++) { 32c4762a1bSJed Brown midx[0] = i-1; midx[1] = i; midx[2] = i+1; 33*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,3,midx,v,INSERT_VALUES)); 34c4762a1bSJed Brown } 35c4762a1bSJed Brown i = 0; midx[0] = 0; midx[1] = 1; 36c4762a1bSJed Brown v[0] = 2.0; v[1] = -1.; 37*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES)); 38c4762a1bSJed Brown i = n-1; midx[0] = n-2; midx[1] = n-1; 39c4762a1bSJed Brown v[0] = -1.0; v[1] = 2.; 40*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES)); 41c4762a1bSJed Brown 42*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 43*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 44c4762a1bSJed Brown 45*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(C,u,b)); 46c4762a1bSJed Brown 47c4762a1bSJed Brown for (i=0; i<n; i++) { 48*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatSOR(C,b,omega,SOR_FORWARD_SWEEP,0.0,1,1,x)); 49*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecWAXPY(e,-1.0,x,u)); 50*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(e,NORM_2,&norm)); 51*5f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"2-norm of error %g\n",(double)norm)); 52c4762a1bSJed Brown } 53*5f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 54*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 55*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&b)); 56*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&u)); 57*5f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&e)); 58c4762a1bSJed Brown ierr = PetscFinalize(); 59c4762a1bSJed Brown return ierr; 60c4762a1bSJed Brown } 61c4762a1bSJed Brown 62c4762a1bSJed Brown /*TEST 63c4762a1bSJed Brown 64c4762a1bSJed Brown test: 65c4762a1bSJed Brown 66c4762a1bSJed Brown TEST*/ 67