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 PetscScalar v[3]; 12c4762a1bSJed Brown PetscReal omega = 1.0,norm; 13c4762a1bSJed Brown 14*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 155f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetReal(NULL,NULL,"-omega",&omega,NULL)); 165f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); 17c4762a1bSJed Brown 185f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(PETSC_COMM_SELF,&C)); 195f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(C,n,n,n,n)); 205f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetType(C,MATSEQDENSE)); 215f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetUp(C)); 225f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&b)); 235f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&x)); 245f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&u)); 255f80ce2aSJacob Faibussowitsch CHKERRQ(VecCreateSeq(PETSC_COMM_SELF,n,&e)); 265f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(u,1.0)); 275f80ce2aSJacob Faibussowitsch CHKERRQ(VecSet(x,0.0)); 28c4762a1bSJed Brown 29c4762a1bSJed Brown v[0] = -1.; v[1] = 2.; v[2] = -1.; 30c4762a1bSJed Brown for (i=1; i<n-1; i++) { 31c4762a1bSJed Brown midx[0] = i-1; midx[1] = i; midx[2] = i+1; 325f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,3,midx,v,INSERT_VALUES)); 33c4762a1bSJed Brown } 34c4762a1bSJed Brown i = 0; midx[0] = 0; midx[1] = 1; 35c4762a1bSJed Brown v[0] = 2.0; v[1] = -1.; 365f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES)); 37c4762a1bSJed Brown i = n-1; midx[0] = n-2; midx[1] = n-1; 38c4762a1bSJed Brown v[0] = -1.0; v[1] = 2.; 395f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES)); 40c4762a1bSJed Brown 415f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 425f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 43c4762a1bSJed Brown 445f80ce2aSJacob Faibussowitsch CHKERRQ(MatMult(C,u,b)); 45c4762a1bSJed Brown 46c4762a1bSJed Brown for (i=0; i<n; i++) { 475f80ce2aSJacob Faibussowitsch CHKERRQ(MatSOR(C,b,omega,SOR_FORWARD_SWEEP,0.0,1,1,x)); 485f80ce2aSJacob Faibussowitsch CHKERRQ(VecWAXPY(e,-1.0,x,u)); 495f80ce2aSJacob Faibussowitsch CHKERRQ(VecNorm(e,NORM_2,&norm)); 505f80ce2aSJacob Faibussowitsch CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"2-norm of error %g\n",(double)norm)); 51c4762a1bSJed Brown } 525f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&C)); 535f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&x)); 545f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&b)); 555f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&u)); 565f80ce2aSJacob Faibussowitsch CHKERRQ(VecDestroy(&e)); 57*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 58*b122ec5aSJacob Faibussowitsch return 0; 59c4762a1bSJed Brown } 60c4762a1bSJed Brown 61c4762a1bSJed Brown /*TEST 62c4762a1bSJed Brown 63c4762a1bSJed Brown test: 64c4762a1bSJed Brown 65c4762a1bSJed Brown TEST*/ 66