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C++ MatSetUp函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中MatSetUp函数的典型用法代码示例。如果您正苦于以下问题：C++ MatSetUp函数的具体用法？C++ MatSetUp怎么用？C++ MatSetUp使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了MatSetUp函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: main

int main(int argc,char **args)
{
  const PetscInt    inds[]  = {0,1};
  PetscScalar       avals[] = {2,3,5,7};
  Mat               S;
  User              user;
  PetscErrorCode    ierr;
  Vec               base;

  ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
  ierr = PetscNew(&user);CHKERRQ(ierr);
  ierr = MatCreateSeqAIJ(PETSC_COMM_WORLD,2,2,2,NULL,&user->B);CHKERRQ(ierr);
  ierr = MatSetUp(user->B);CHKERRQ(ierr);
  ierr = MatSetValues(user->B,2,inds,2,inds,avals,INSERT_VALUES);CHKERRQ(ierr);
  ierr = MatAssemblyBegin(user->B,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(user->B,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatCreateVecs(user->B,&base,NULL);CHKERRQ(ierr);
  ierr = MatCreateShell(PETSC_COMM_WORLD,2,2,2,2,user,&S);CHKERRQ(ierr);
  ierr = MatSetUp(S);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S,MATOP_MULT,(void (*)(void))MatMult_User);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S,MATOP_MULT_TRANSPOSE,(void (*)(void))MatMultTranspose_User);CHKERRQ(ierr);

  ierr = MatShellTestMult(S,MyFunction,base,user,NULL);CHKERRQ(ierr);
  ierr = MatShellTestMultTranspose(S,MyFunction,base,user,NULL);CHKERRQ(ierr);

  ierr = VecDestroy(&base);CHKERRQ(ierr);
  ierr = MatDestroy(&user->B);CHKERRQ(ierr);
  ierr = MatDestroy(&S);CHKERRQ(ierr);
  ierr = PetscFree(user);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:32，代码来源:ex218.c


示例2: main

int main(int argc,char **args)
{
  const PetscScalar xvals[] = {11,13},yvals[] = {17,19};
  const PetscInt    inds[]  = {0,1};
  PetscScalar       avals[] = {2,3,5,7};
  Mat               S1,S2;
  Vec               X,Y;
  User              user;
  PetscErrorCode    ierr;

  ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;

  ierr = PetscNew(&user);CHKERRQ(ierr);
  ierr = MatCreateSeqAIJ(PETSC_COMM_WORLD,2,2,2,NULL,&user->A);CHKERRQ(ierr);
  ierr = MatSetUp(user->A);CHKERRQ(ierr);
  ierr = MatSetValues(user->A,2,inds,2,inds,avals,INSERT_VALUES);CHKERRQ(ierr);
  ierr = MatAssemblyBegin(user->A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(user->A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_WORLD,2,&X);CHKERRQ(ierr);
  ierr = VecSetValues(X,2,inds,xvals,INSERT_VALUES);CHKERRQ(ierr);
  ierr = VecAssemblyBegin(X);CHKERRQ(ierr);
  ierr = VecAssemblyEnd(X);CHKERRQ(ierr);
  ierr = VecDuplicate(X,&Y);CHKERRQ(ierr);
  ierr = VecSetValues(Y,2,inds,yvals,INSERT_VALUES);CHKERRQ(ierr);
  ierr = VecAssemblyBegin(Y);CHKERRQ(ierr);
  ierr = VecAssemblyEnd(Y);CHKERRQ(ierr);

  ierr = MatCreateShell(PETSC_COMM_WORLD,2,2,2,2,user,&S1);CHKERRQ(ierr);
  ierr = MatSetUp(S1);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S1,MATOP_MULT,(void (*)(void))MatMult_User);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S1,MATOP_COPY,(void (*)(void))MatCopy_User);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S1,MATOP_DESTROY,(void (*)(void))MatDestroy_User);CHKERRQ(ierr);
  ierr = MatCreateShell(PETSC_COMM_WORLD,2,2,2,2,NULL,&S2);CHKERRQ(ierr);
  ierr = MatSetUp(S2);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S2,MATOP_MULT,(void (*)(void))MatMult_User);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S2,MATOP_COPY,(void (*)(void))MatCopy_User);CHKERRQ(ierr);
  ierr = MatShellSetOperation(S2,MATOP_DESTROY,(void (*)(void))MatDestroy_User);CHKERRQ(ierr);

  ierr = MatScale(S1,31);CHKERRQ(ierr);
  ierr = MatShift(S1,37);CHKERRQ(ierr);
  ierr = MatDiagonalScale(S1,X,Y);CHKERRQ(ierr);
  ierr = MatCopy(S1,S2,SAME_NONZERO_PATTERN);CHKERRQ(ierr);
  ierr = MatMult(S1,X,Y);CHKERRQ(ierr);
  ierr = VecView(Y,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
  ierr = MatMult(S2,X,Y);CHKERRQ(ierr);
  ierr = VecView(Y,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);

  ierr = MatDestroy(&S1);CHKERRQ(ierr);
  ierr = MatDestroy(&S2);CHKERRQ(ierr);
  ierr = VecDestroy(&X);CHKERRQ(ierr);
  ierr = VecDestroy(&Y);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:54，代码来源:ex205.c


示例3: main

int main(int argc,char **args)
{
  Mat                 A1,A2,A3,A4,nest;
  Mat                 mata[4];
  Mat                 aij;
  MPI_Comm            comm;
  PetscInt            m,n,istart,iend,ii,i,J,j;
  PetscScalar         v;
  PetscMPIInt         size;
  PetscErrorCode      ierr;

  ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
  comm = PETSC_COMM_WORLD;
  ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr);
  /*
     Assemble the matrix for the five point stencil, YET AGAIN
  */
  ierr = MatCreate(comm,&A1);CHKERRQ(ierr);
  m=2,n=2;
  ierr = MatSetSizes(A1,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr);
  ierr = MatSetFromOptions(A1);CHKERRQ(ierr);
  ierr = MatSetUp(A1);CHKERRQ(ierr);
  ierr = MatGetOwnershipRange(A1,&istart,&iend);CHKERRQ(ierr);
  for (ii=istart; ii<iend; ii++) {
    v = -1.0; i = ii/n; j = ii - i*n;
    if (i>0)   {J = ii - n; ierr = MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);}
    if (i<m-1) {J = ii + n; ierr = MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);}
    if (j>0)   {J = ii - 1; ierr = MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);}
    if (j<n-1) {J = ii + 1; ierr = MatSetValues(A1,1,&ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);}
    v = 4.0; ierr = MatSetValues(A1,1,&ii,1,&ii,&v,INSERT_VALUES);CHKERRQ(ierr);
  }
  ierr = MatAssemblyBegin(A1,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(A1,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatView(A1,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
  ierr = MatDuplicate(A1,MAT_COPY_VALUES,&A2);CHKERRQ(ierr);
  ierr = MatDuplicate(A1,MAT_COPY_VALUES,&A3);CHKERRQ(ierr);
  ierr = MatDuplicate(A1,MAT_COPY_VALUES,&A4);CHKERRQ(ierr);
  /*create a nest matrix */
  ierr = MatCreate(comm,&nest);CHKERRQ(ierr);
  ierr = MatSetType(nest,MATNEST);CHKERRQ(ierr);
  mata[0]=A1,mata[1]=A2,mata[2]=A3,mata[3]=A4;
  ierr = MatNestSetSubMats(nest,2,NULL,2,NULL,mata);CHKERRQ(ierr);
  ierr = MatSetUp(nest);CHKERRQ(ierr);
  ierr = MatConvert(nest,MATAIJ,MAT_INITIAL_MATRIX,&aij);CHKERRQ(ierr);
  ierr = MatView(aij,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
  ierr = MatDestroy(&nest);CHKERRQ(ierr);
  ierr = MatDestroy(&aij);CHKERRQ(ierr);
  ierr = MatDestroy(&A1);CHKERRQ(ierr);
  ierr = MatDestroy(&A2);CHKERRQ(ierr);
  ierr = MatDestroy(&A3);CHKERRQ(ierr);
  ierr = MatDestroy(&A4);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:54，代码来源:ex195.c


示例4: main

int main(int argc,char **args)
{
  PetscErrorCode ierr;
  Mat            A,B,C;
  PetscBool      different=PETSC_FALSE,skip=PETSC_FALSE;
  PetscInt       m0,m1,n=128,i;

  PetscInitialize(&argc,&args,(char*)0,help);
  ierr = PetscOptionsGetBool(NULL,"-different",&different,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsGetBool(NULL,"-skip",&skip,NULL);CHKERRQ(ierr);
  /*
     Create matrices
     A = tridiag(1,-2,1) and B = diag(7);
  */
  ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
  ierr = MatCreate(PETSC_COMM_WORLD,&B);CHKERRQ(ierr);
  ierr = MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);CHKERRQ(ierr);
  ierr = MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,n,n);CHKERRQ(ierr);
  ierr = MatSetFromOptions(A);CHKERRQ(ierr);
  ierr = MatSetFromOptions(B);CHKERRQ(ierr);
  ierr = MatSetUp(A);CHKERRQ(ierr);
  ierr = MatSetUp(B);CHKERRQ(ierr);
  ierr = MatGetOwnershipRange(A,&m0,&m1);CHKERRQ(ierr);
  for (i=m0;i<m1;i++) {
    if (i>0) { ierr = MatSetValue(A,i,i-1,-1.0,INSERT_VALUES);CHKERRQ(ierr); }
    if (i<n-1) { ierr = MatSetValue(A,i,i+1,-1.0,INSERT_VALUES);CHKERRQ(ierr); }
    ierr = MatSetValue(A,i,i,2.0,INSERT_VALUES);CHKERRQ(ierr);
    ierr = MatSetValue(B,i,i,7.0,INSERT_VALUES);CHKERRQ(ierr);
  }
  ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);

  ierr = MatDuplicate(A,MAT_COPY_VALUES,&C);CHKERRQ(ierr);
  /* Add B */
  ierr = MatAXPY(C,1.0,B,(different)?DIFFERENT_NONZERO_PATTERN:SUBSET_NONZERO_PATTERN);CHKERRQ(ierr);
  /* Add A */
  if (!skip) { ierr = MatAXPY(C,1.0,A,SUBSET_NONZERO_PATTERN);CHKERRQ(ierr); }

  /*
     Free memory
  */
  ierr = MatDestroy(&A);CHKERRQ(ierr);
  ierr = MatDestroy(&B);CHKERRQ(ierr);
  ierr = MatDestroy(&C);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return 0;
}
开发者ID:fengyuqi，项目名称:petsc，代码行数:49，代码来源:ex172.c


示例5: MatGetFactor_seqaij_essl

PETSC_EXTERN PetscErrorCode MatGetFactor_seqaij_essl(Mat A,MatFactorType ftype,Mat *F)
{
  Mat            B;
  PetscErrorCode ierr;
  Mat_Essl       *essl;

  PetscFunctionBegin;
  if (A->cmap->N != A->rmap->N) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"matrix must be square");
  ierr = MatCreate(PetscObjectComm((PetscObject)A),&B);CHKERRQ(ierr);
  ierr = MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,A->rmap->n,A->cmap->n);CHKERRQ(ierr);
  ierr = PetscStrallocpy("essl",&((PetscObject)B)->type_name);CHKERRQ(ierr);
  ierr = MatSetUp(B);CHKERRQ(ierr);

  ierr = PetscNewLog(B,&essl);CHKERRQ(ierr);

  B->data                  = essl;
  B->ops->lufactorsymbolic = MatLUFactorSymbolic_Essl;
  B->ops->destroy          = MatDestroy_Essl;
  B->ops->getinfo          = MatGetInfo_External;

  ierr = PetscObjectComposeFunction((PetscObject)B,"MatFactorGetSolverType_C",MatFactorGetSolverType_essl);CHKERRQ(ierr);

  B->factortype = MAT_FACTOR_LU;
  ierr = PetscFree(B->solvertype);CHKERRQ(ierr);
  ierr = PetscStrallocpy(MATSOLVERESSL,&B->solvertype);CHKERRQ(ierr);

  *F            = B;
  PetscFunctionReturn(0);
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:29，代码来源:essl.c


示例6: SparseGp_KGradient

int
SparseGp_KGradient (SparseGp *gp, HyperParam hp, int lengthInd)
{
    PetscErrorCode ierr;
    (void) ierr;

    int N = gp->trainObs->size2;

    /* create sparse K matrix */
    ierr = MatCreate (PETSC_COMM_WORLD, &(gp->_KGradient)); CHKERRQ(ierr);
    ierr = MatSetSizes (gp->_KGradient, gp->nlocal, gp->nlocal, N, N); CHKERRQ(ierr);
    ierr = MatSetFromOptions(gp->_KGradient); CHKERRQ(ierr);
    ierr = MatSetUp (gp->_KGradient); CHKERRQ(ierr);

    /* assemble matrix */
    switch (hp) {
    case GP_HYPERPARAM_SIGMA0: {
        petsc_util_fillSigma0GradMatFromKernel (gp->kern, gp->trainObs, &(gp->_KGradient), 0, N, gp->rstart, gp->rend);
        break;
    }
    case GP_HYPERPARAM_LENGTH_I: {
        petsc_util_fillLenghtGradMatFromKernel (gp->kern, gp->trainObs, &(gp->_KGradient), 0, N, gp->rstart, gp->rend, lengthInd);
        break;
    }
    default:
        printf ("Unknown hyperparameter type\n");
        exit (EXIT_FAILURE);
    }

    ierr = MatAssemblyBegin(gp->_KGradient, MAT_FINAL_ASSEMBLY); CHKERRQ (ierr);
    ierr = MatAssemblyEnd(gp->_KGradient, MAT_FINAL_ASSEMBLY); CHKERRQ (ierr);

    return EXIT_SUCCESS;
}
开发者ID:pjozog，项目名称:sparse-gp-petsc，代码行数:34，代码来源:sparsegp.c


示例7: MatGetFactor_seqaij_matlab

PETSC_EXTERN PetscErrorCode MatGetFactor_seqaij_matlab(Mat A,MatFactorType ftype,Mat *F)
{
    PetscErrorCode ierr;

    PetscFunctionBegin;
    if (A->cmap->N != A->rmap->N) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"matrix must be square");
    ierr                         = MatCreate(PetscObjectComm((PetscObject)A),F);
    CHKERRQ(ierr);
    ierr                         = MatSetSizes(*F,A->rmap->n,A->cmap->n,A->rmap->n,A->cmap->n);
    CHKERRQ(ierr);
    ierr                         = PetscStrallocpy("matlab",&((PetscObject)*F)->type_name);
    CHKERRQ(ierr);
    ierr                         = MatSetUp(*F);
    CHKERRQ(ierr);

    (*F)->ops->destroy           = MatDestroy_matlab;
    (*F)->ops->getinfo           = MatGetInfo_External;
    (*F)->ops->lufactorsymbolic  = MatLUFactorSymbolic_Matlab;
    (*F)->ops->ilufactorsymbolic = MatLUFactorSymbolic_Matlab;

    ierr = PetscObjectComposeFunction((PetscObject)(*F),"MatFactorGetSolverPackage_C",MatFactorGetSolverPackage_seqaij_matlab);
    CHKERRQ(ierr);

    (*F)->factortype = ftype;
    ierr = PetscFree((*F)->solvertype);
    CHKERRQ(ierr);
    ierr = PetscStrallocpy(MATSOLVERMATLAB,&(*F)->solvertype);
    CHKERRQ(ierr);
    PetscFunctionReturn(0);
}
开发者ID:petsc，项目名称:petsc，代码行数:30，代码来源:aijmatlab.c


示例8: PCSetUp_Eisenstat

static PetscErrorCode PCSetUp_Eisenstat(PC pc)
{
  PetscErrorCode ierr;
  PetscInt       M,N,m,n;
  PC_Eisenstat   *eis = (PC_Eisenstat*)pc->data;

  PetscFunctionBegin;
  if (!pc->setupcalled) {
    ierr = MatGetSize(pc->mat,&M,&N);CHKERRQ(ierr);
    ierr = MatGetLocalSize(pc->mat,&m,&n);CHKERRQ(ierr);
    ierr = MatCreate(((PetscObject)pc)->comm,&eis->shell);CHKERRQ(ierr);
    ierr = MatSetSizes(eis->shell,m,n,M,N);CHKERRQ(ierr);
    ierr = MatSetType(eis->shell,MATSHELL);CHKERRQ(ierr);
    ierr = MatSetUp(eis->shell);CHKERRQ(ierr);
    ierr = MatShellSetContext(eis->shell,(void*)pc);CHKERRQ(ierr);
    ierr = PetscLogObjectParent(pc,eis->shell);CHKERRQ(ierr);
    ierr = MatShellSetOperation(eis->shell,MATOP_MULT,(void(*)(void))PCMult_Eisenstat);CHKERRQ(ierr);
  }
  if (!eis->usediag) PetscFunctionReturn(0);
  if (!pc->setupcalled) {
    ierr = MatGetVecs(pc->pmat,&eis->diag,0);CHKERRQ(ierr);
    ierr = PetscLogObjectParent(pc,eis->diag);CHKERRQ(ierr);
  }
  ierr = MatGetDiagonal(pc->pmat,eis->diag);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:26，代码来源:eisen.c


示例9: ComputeRHSMatrix

PetscErrorCode ComputeRHSMatrix(PetscInt m,PetscInt nrhs,Mat* C)
{
  PetscErrorCode ierr;
  PetscRandom    rand;
  Mat            RHS;
  PetscScalar    *array,rval;
  PetscInt       i,k;

  PetscFunctionBegin;
  ierr = MatCreate(PETSC_COMM_WORLD,&RHS);CHKERRQ(ierr);
  ierr = MatSetSizes(RHS,m,PETSC_DECIDE,PETSC_DECIDE,nrhs);CHKERRQ(ierr);
  ierr = MatSetType(RHS,MATSEQDENSE);CHKERRQ(ierr);
  ierr = MatSetUp(RHS);CHKERRQ(ierr);

  ierr = PetscRandomCreate(PETSC_COMM_WORLD,&rand);CHKERRQ(ierr);
  ierr = PetscRandomSetFromOptions(rand);CHKERRQ(ierr);
  ierr = MatDenseGetArray(RHS,&array);CHKERRQ(ierr);
  for (i=0; i<m; i++){
    ierr = PetscRandomGetValue(rand,&rval);CHKERRQ(ierr);
    array[i] = rval;
  }
  if (nrhs > 1){
    for (k=1; k<nrhs; k++){
      for (i=0; i<m; i++){
        array[m*k+i] = array[i];
      }
    }
  }
  ierr = MatDenseRestoreArray(RHS,&array);CHKERRQ(ierr);
  ierr = MatAssemblyBegin(RHS,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(RHS,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  *C = RHS;
  ierr = PetscRandomDestroy(&rand);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:erdc-cm，项目名称:petsc-dev，代码行数:35，代码来源:ex129.c


示例10: main

int main(int argc, char **argv)
{
    Mat            A;
    KSP            ksp;
    DM             shell;
    Vec            *left, *right;
    MPI_Comm       c;
    PetscErrorCode ierr;

    ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr;
    c = PETSC_COMM_WORLD;

    ierr = MatCreate(c, &A); CHKERRQ(ierr);
    ierr = MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE); CHKERRQ(ierr);
    ierr = MatSetFromOptions(A); CHKERRQ(ierr);
    ierr = MatSetUp(A); CHKERRQ(ierr);
    ierr = KSPCreate(c, &ksp); CHKERRQ(ierr);
    ierr = KSPSetOperators(ksp, A, A); CHKERRQ(ierr);
    ierr = KSPSetFromOptions(ksp); CHKERRQ(ierr);
    ierr = DMShellCreate(c, &shell); CHKERRQ(ierr);
    ierr = DMSetFromOptions(shell); CHKERRQ(ierr);
    ierr = DMSetUp(shell); CHKERRQ(ierr);
    ierr = KSPSetDM(ksp, shell); CHKERRQ(ierr);

    ierr = KSPCreateVecs(ksp, 1, &right, 1, &left); CHKERRQ(ierr);
    ierr = VecView(right[0], PETSC_VIEWER_STDOUT_(c));CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&right); CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&left); CHKERRQ(ierr);

    ierr = DMDestroy(&shell); CHKERRQ(ierr);
    ierr = KSPDestroy(&ksp); CHKERRQ(ierr);
    ierr = MatDestroy(&A); CHKERRQ(ierr);
    PetscFinalize();
    return 0;
}
开发者ID:tom-klotz，项目名称:petsc，代码行数:35，代码来源:ex45.c


示例11: KSPSetUp_TSIRM

static PetscErrorCode KSPSetUp_TSIRM(KSP ksp)
{
    PetscErrorCode ierr;
    KSP_TSIRM      *tsirm = (KSP_TSIRM*)ksp->data;

    PetscFunctionBegin;
    /* Initialization */
    tsirm->tol_ls     = 1e-40;
    tsirm->size_ls    = 12;
    tsirm->maxiter_ls = 15;
    tsirm->cgls       = 0;

    /* Matrix of the system */
    ierr = KSPGetOperators(ksp,&tsirm->A,NULL);
    CHKERRQ(ierr);    /* Matrix of the system   */
    ierr = MatGetSize(tsirm->A,&tsirm->size,NULL);
    CHKERRQ(ierr); /* Size of the system     */
    ierr = MatGetOwnershipRange(tsirm->A,&tsirm->Istart,&tsirm->Iend);
    CHKERRQ(ierr);

    /* Matrix S of residuals */
    ierr = MatCreate(PETSC_COMM_WORLD,&tsirm->S);
    CHKERRQ(ierr);
    ierr = MatSetSizes(tsirm->S,tsirm->Iend-tsirm->Istart,PETSC_DECIDE,tsirm->size,tsirm->size_ls);
    CHKERRQ(ierr);
    ierr = MatSetType(tsirm->S,MATDENSE);
    CHKERRQ(ierr);
    ierr = MatSetUp(tsirm->S);
    CHKERRQ(ierr);

    /* Residual and vector Alpha computed in the minimization step */
    ierr = MatCreateVecs(tsirm->S,&tsirm->Alpha,&tsirm->r);
    CHKERRQ(ierr);
    PetscFunctionReturn(0);
}
开发者ID:petsc，项目名称:petsc，代码行数:35，代码来源:tsirm.c


示例12: the

/*@
      MatCreateTranspose - Creates a new matrix object that behaves like A'

   Collective on Mat

   Input Parameter:
.   A  - the (possibly rectangular) matrix

   Output Parameter:
.   N - the matrix that represents A'

   Level: intermediate

   Notes:
    The transpose A' is NOT actually formed! Rather the new matrix
          object performs the matrix-vector product by using the MatMultTranspose() on
          the original matrix

.seealso: MatCreateNormal(), MatMult(), MatMultTranspose(), MatCreate()

@*/
PetscErrorCode  MatCreateTranspose(Mat A,Mat *N)
{
  PetscErrorCode ierr;
  PetscInt       m,n;
  Mat_Transpose  *Na;

  PetscFunctionBegin;
  ierr = MatGetLocalSize(A,&m,&n);CHKERRQ(ierr);
  ierr = MatCreate(PetscObjectComm((PetscObject)A),N);CHKERRQ(ierr);
  ierr = MatSetSizes(*N,n,m,PETSC_DECIDE,PETSC_DECIDE);CHKERRQ(ierr);
  ierr = PetscLayoutSetUp((*N)->rmap);CHKERRQ(ierr);
  ierr = PetscLayoutSetUp((*N)->cmap);CHKERRQ(ierr);
  ierr = PetscObjectChangeTypeName((PetscObject)*N,MATTRANSPOSEMAT);CHKERRQ(ierr);

  ierr       = PetscNewLog(*N,&Na);CHKERRQ(ierr);
  (*N)->data = (void*) Na;
  ierr       = PetscObjectReference((PetscObject)A);CHKERRQ(ierr);
  Na->A      = A;

  (*N)->ops->destroy          = MatDestroy_Transpose;
  (*N)->ops->mult             = MatMult_Transpose;
  (*N)->ops->multadd          = MatMultAdd_Transpose;
  (*N)->ops->multtranspose    = MatMultTranspose_Transpose;
  (*N)->ops->multtransposeadd = MatMultTransposeAdd_Transpose;
  (*N)->ops->duplicate        = MatDuplicate_Transpose;
  (*N)->ops->getvecs          = MatCreateVecs_Transpose;
  (*N)->ops->axpy             = MatAXPY_Transpose;
  (*N)->assembled             = PETSC_TRUE;

  ierr = PetscObjectComposeFunction((PetscObject)(*N),"MatTransposeGetMat_C",MatTransposeGetMat_Transpose);CHKERRQ(ierr);
  ierr = MatSetBlockSizes(*N,PetscAbs(A->cmap->bs),PetscAbs(A->rmap->bs));CHKERRQ(ierr);
  ierr = MatSetUp(*N);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
开发者ID:petsc，项目名称:petsc，代码行数:55，代码来源:transm.c


示例13: main

int main(int argc,char **argv)
{
  PetscErrorCode ierr;
  PetscInt       time_steps = 100,steps;
  PetscMPIInt    size;
  Vec            global;
  PetscReal      dt,ftime;
  TS             ts;
  MatStructure   A_structure;
  Mat            A = 0;

  ierr = PetscInitialize(&argc,&argv,(char*)0,help);CHKERRQ(ierr);
  ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);

  ierr = PetscOptionsGetInt(NULL,"-time",&time_steps,NULL);CHKERRQ(ierr);

  /* set initial conditions */
  ierr = VecCreate(PETSC_COMM_WORLD,&global);CHKERRQ(ierr);
  ierr = VecSetSizes(global,PETSC_DECIDE,3);CHKERRQ(ierr);
  ierr = VecSetFromOptions(global);CHKERRQ(ierr);
  ierr = Initial(global,NULL);CHKERRQ(ierr);

  /* make timestep context */
  ierr = TSCreate(PETSC_COMM_WORLD,&ts);CHKERRQ(ierr);
  ierr = TSSetProblemType(ts,TS_NONLINEAR);CHKERRQ(ierr);
  ierr = TSMonitorSet(ts,Monitor,NULL,NULL);CHKERRQ(ierr);

  dt = 0.1;

  /*
    The user provides the RHS and Jacobian
  */
  ierr = TSSetRHSFunction(ts,NULL,RHSFunction,NULL);CHKERRQ(ierr);
  ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
  ierr = MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,3,3);CHKERRQ(ierr);
  ierr = MatSetFromOptions(A);CHKERRQ(ierr);
  ierr = MatSetUp(A);CHKERRQ(ierr);
  ierr = RHSJacobian(ts,0.0,global,&A,&A,&A_structure,NULL);CHKERRQ(ierr);
  ierr = TSSetRHSJacobian(ts,A,A,RHSJacobian,NULL);CHKERRQ(ierr);

  ierr = TSSetFromOptions(ts);CHKERRQ(ierr);

  ierr = TSSetInitialTimeStep(ts,0.0,dt);CHKERRQ(ierr);
  ierr = TSSetDuration(ts,time_steps,1);CHKERRQ(ierr);
  ierr = TSSetSolution(ts,global);CHKERRQ(ierr);

  ierr = TSSolve(ts,global);CHKERRQ(ierr);
  ierr = TSGetSolveTime(ts,&ftime);CHKERRQ(ierr);
  ierr = TSGetTimeStepNumber(ts,&steps);CHKERRQ(ierr);


  /* free the memories */

  ierr = TSDestroy(&ts);CHKERRQ(ierr);
  ierr = VecDestroy(&global);CHKERRQ(ierr);
  ierr = MatDestroy(&A);CHKERRQ(ierr);

  ierr = PetscFinalize();
  return 0;
}
开发者ID:feelpp，项目名称:debian-petsc，代码行数:60，代码来源:ex2.c


示例14: main

int main(int argc, char **argv)
{
  Mat mat;
  MatNullSpace nsp;
  PetscBool prefix = PETSC_FALSE, flg;
  PetscErrorCode ierr;
  PetscInt zero = 0;
  PetscScalar value = 0;
  ierr = PetscInitialize(&argc, &argv, NULL, help); if (ierr) return ierr;

  ierr = PetscOptionsGetBool(NULL, NULL, "-with_prefix",&prefix,NULL);CHKERRQ(ierr);
  ierr = MatCreateDense(PETSC_COMM_WORLD, 1, 1, 1, 1, NULL, &mat);CHKERRQ(ierr);
  ierr = MatSetOptionsPrefix(mat, prefix ? "prefix_" : NULL);CHKERRQ(ierr);
  ierr = MatSetUp(mat);CHKERRQ(ierr);
  ierr = MatSetValues(mat, 1, &zero, 1, &zero, &value, INSERT_VALUES);CHKERRQ(ierr);
  ierr = MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatNullSpaceCreate(PETSC_COMM_WORLD, PETSC_TRUE, 0, NULL, &nsp);CHKERRQ(ierr);
  ierr = MatNullSpaceTest(nsp, mat, &flg);CHKERRQ(ierr);
  if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Null space test failed!");
  ierr = MatNullSpaceDestroy(&nsp);CHKERRQ(ierr);
  ierr = MatDestroy(&mat);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:25，代码来源:ex227.c


示例15: DMCreateMatrix_Shell

static PetscErrorCode DMCreateMatrix_Shell(DM dm,Mat *J)
{
    PetscErrorCode ierr;
    DM_Shell       *shell = (DM_Shell*)dm->data;
    Mat            A;

    PetscFunctionBegin;
    PetscValidHeaderSpecific(dm,DM_CLASSID,1);
    PetscValidPointer(J,3);
    if (!shell->A) {
        if (shell->Xglobal) {
            PetscInt m,M;
            ierr = PetscInfo(dm,"Naively creating matrix using global vector distribution without preallocation\n");
            CHKERRQ(ierr);
            ierr = VecGetSize(shell->Xglobal,&M);
            CHKERRQ(ierr);
            ierr = VecGetLocalSize(shell->Xglobal,&m);
            CHKERRQ(ierr);
            ierr = MatCreate(PetscObjectComm((PetscObject)dm),&shell->A);
            CHKERRQ(ierr);
            ierr = MatSetSizes(shell->A,m,m,M,M);
            CHKERRQ(ierr);
            ierr = MatSetType(shell->A,dm->mattype);
            CHKERRQ(ierr);
            ierr = MatSetUp(shell->A);
            CHKERRQ(ierr);
        } else SETERRQ(PetscObjectComm((PetscObject)dm),PETSC_ERR_USER,"Must call DMShellSetMatrix(), DMShellSetCreateMatrix(), or provide a vector");
    }
    A = shell->A;
    /* the check below is tacky and incomplete */
    if (dm->mattype) {
        PetscBool flg,aij,seqaij,mpiaij;
        ierr = PetscObjectTypeCompare((PetscObject)A,dm->mattype,&flg);
        CHKERRQ(ierr);
        ierr = PetscObjectTypeCompare((PetscObject)A,MATSEQAIJ,&seqaij);
        CHKERRQ(ierr);
        ierr = PetscObjectTypeCompare((PetscObject)A,MATMPIAIJ,&mpiaij);
        CHKERRQ(ierr);
        ierr = PetscStrcmp(dm->mattype,MATAIJ,&aij);
        CHKERRQ(ierr);
        if (!flg) {
            if (!(aij && (seqaij || mpiaij))) SETERRQ2(PetscObjectComm((PetscObject)dm),PETSC_ERR_ARG_NOTSAMETYPE,"Requested matrix of type %s, but only %s available",dm->mattype,((PetscObject)A)->type_name);
        }
    }
    if (((PetscObject)A)->refct < 2) { /* We have an exclusive reference so we can give it out */
        ierr = PetscObjectReference((PetscObject)A);
        CHKERRQ(ierr);
        ierr = MatZeroEntries(A);
        CHKERRQ(ierr);
        *J   = A;
    } else {                      /* Need to create a copy, could use MAT_SHARE_NONZERO_PATTERN in most cases */
        ierr = MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,J);
        CHKERRQ(ierr);
        ierr = MatZeroEntries(*J);
        CHKERRQ(ierr);
    }
    PetscFunctionReturn(0);
}
开发者ID:petsc，项目名称:petsc，代码行数:58，代码来源:dmshell.c


示例16: time

/*
   RHSMatrixLaplacian - User-provided routine to compute the right-hand-side
   matrix for the Laplacian operator

   Input Parameters:
   ts - the TS context
   t - current time  (ignored)
   X - current solution (ignored)
   dummy - optional user-defined context, as set by TSetRHSJacobian()

   Output Parameters:
   AA - Jacobian matrix
   BB - optionally different matrix from which the preconditioner is built
   str - flag indicating matrix structure

*/
PetscErrorCode RHSMatrixLaplaciangllDM(TS ts,PetscReal t,Vec X,Mat A,Mat BB,void *ctx)
{
  PetscReal      **temp;
  PetscReal      vv;
  AppCtx         *appctx = (AppCtx*)ctx;     /* user-defined application context */
  PetscErrorCode ierr;
  PetscInt       i,xs,xn,l,j;
  PetscInt       *rowsDM;
  PetscBool      flg = PETSC_FALSE;

  ierr = PetscOptionsGetBool(NULL,NULL,"-gll_mf",&flg,NULL);CHKERRQ(ierr);

  if (!flg) {
    /*
     Creates the element stiffness matrix for the given gll
     */
    ierr = PetscGLLElementLaplacianCreate(&appctx->SEMop.gll,&temp);CHKERRQ(ierr);
    /* workarround for clang analyzer warning: Division by zero */
    if (appctx->param.N <= 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_ARG_WRONG,"Spectral element order should be > 1");

    /* scale by the size of the element */
    for (i=0; i<appctx->param.N; i++) {
      vv=-appctx->param.mu*2.0/appctx->param.Le;
      for (j=0; j<appctx->param.N; j++) temp[i][j]=temp[i][j]*vv;
    }

    ierr = MatSetOption(A,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_FALSE);CHKERRQ(ierr);
    ierr = DMDAGetCorners(appctx->da,&xs,NULL,NULL,&xn,NULL,NULL);CHKERRQ(ierr);

    xs   = xs/(appctx->param.N-1);
    xn   = xn/(appctx->param.N-1);

    ierr = PetscMalloc1(appctx->param.N,&rowsDM);CHKERRQ(ierr);
    /*
     loop over local elements
     */
    for (j=xs; j<xs+xn; j++) {
      for (l=0; l<appctx->param.N; l++) {
        rowsDM[l] = 1+(j-xs)*(appctx->param.N-1)+l;
      }
      ierr = MatSetValuesLocal(A,appctx->param.N,rowsDM,appctx->param.N,rowsDM,&temp[0][0],ADD_VALUES);CHKERRQ(ierr);
    }
    ierr = PetscFree(rowsDM);CHKERRQ(ierr);
    ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
    ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
    ierr = VecReciprocal(appctx->SEMop.mass);CHKERRQ(ierr);
    ierr = MatDiagonalScale(A,appctx->SEMop.mass,0);CHKERRQ(ierr);
    ierr = VecReciprocal(appctx->SEMop.mass);CHKERRQ(ierr);

    ierr = PetscGLLElementLaplacianDestroy(&appctx->SEMop.gll,&temp);CHKERRQ(ierr);
  } else {
    ierr = MatSetType(A,MATSHELL);CHKERRQ(ierr);
    ierr = MatSetUp(A);CHKERRQ(ierr);
    ierr = MatShellSetContext(A,appctx);CHKERRQ(ierr);
    ierr = MatShellSetOperation(A,MATOP_MULT,(void (*)(void))MatMult_Laplacian);CHKERRQ(ierr);
  }
  return 0;
}
开发者ID:firedrakeproject，项目名称:petsc，代码行数:74，代码来源:ex50.c


示例17: MatCreateSeqAIJ

void Field_solver::alloc_petsc_matrix_seqaij( Mat *A, PetscInt nrow,
					      PetscInt ncol, PetscInt nonzero_per_row )
{
    PetscErrorCode ierr;
    ierr = MatCreateSeqAIJ( PETSC_COMM_SELF, nrow, ncol,
    			    nonzero_per_row, NULL,  A ); CHKERRXX( ierr );
    ierr = MatSetUp( *A ); CHKERRXX( ierr );
    return;
}
开发者ID:epicf，项目名称:ef，代码行数:9，代码来源:field_solver.cpp


示例18: RunTest

PetscErrorCode RunTest(void)
{
  PetscInt       N    = 100;
  PetscBool      draw = PETSC_FALSE;
  PetscReal      rnorm;
  Mat            A;
  Vec            b,x,r;
  KSP            ksp;
  PC             pc;
  PetscErrorCode ierr;

  PetscFunctionBegin;

  ierr = PetscOptionsGetInt(0,"-N",&N,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsGetBool(0,"-draw",&draw,NULL);CHKERRQ(ierr);

  ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr);
  ierr = MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);CHKERRQ(ierr);
  ierr = MatSetType(A,MATPYTHON);CHKERRQ(ierr);
  ierr = MatPythonSetType(A,"example1.py:Laplace1D");CHKERRQ(ierr);
  ierr = MatSetUp(A);CHKERRQ(ierr);

  ierr = MatGetVecs(A,&x,&b);CHKERRQ(ierr);
  ierr = VecSet(b,1);CHKERRQ(ierr);

  ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
  ierr = KSPSetType(ksp,KSPPYTHON);CHKERRQ(ierr);
  ierr = KSPPythonSetType(ksp,"example1.py:ConjGrad");CHKERRQ(ierr);

  ierr = KSPGetPC(ksp,&pc);CHKERRQ(ierr);
  ierr = PCSetType(pc,PCPYTHON);CHKERRQ(ierr);
  ierr = PCPythonSetType(pc,"example1.py:Jacobi");CHKERRQ(ierr);

  ierr = KSPSetOperators(ksp,A,A);CHKERRQ(ierr);
  ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
  ierr = KSPSolve(ksp,b,x);CHKERRQ(ierr);

  ierr = VecDuplicate(b,&r);CHKERRQ(ierr);
  ierr = MatMult(A,x,r);CHKERRQ(ierr);
  ierr = VecAYPX(r,-1,b);CHKERRQ(ierr);
  ierr = VecNorm(r,NORM_2,&rnorm);CHKERRQ(ierr);
  ierr = PetscPrintf(PETSC_COMM_WORLD,"error norm = %g\n",rnorm);CHKERRQ(ierr);

  if (draw) {
    ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
    ierr = PetscSleep(2);CHKERRQ(ierr);
  }

  ierr = VecDestroy(&x);CHKERRQ(ierr);
  ierr = VecDestroy(&b);CHKERRQ(ierr);
  ierr = VecDestroy(&r);CHKERRQ(ierr);
  ierr = MatDestroy(&A);CHKERRQ(ierr);
  ierr = KSPDestroy(&ksp);CHKERRQ(ierr);

  PetscFunctionReturn(0);
}
开发者ID:00liujj，项目名称:petsc，代码行数:56，代码来源:ex1.c


示例19: BSSPsi

PetscErrorCode BSSPsi(BSS self, Vec c, Vec xs, Vec ys) {
  
  // yj = sum(i) ci ui(xj)

  //  PetscErrorCode ierr;
  //  ierr = BSSChcek(self); CHKERRQ(ierr);
  PetscErrorCode ierr;  
  int nc; VecGetSize(c, &nc);
  int nb; BSSGetSize(self, &nb);
  int nx; VecGetSize(xs, &nx);
  int ny; VecGetSize(ys, &ny);
  if(nc != nb) {
    SETERRQ(self->comm, 1, "size of c must be same as basis size");
  }
  if(nx != ny) {
    SETERRQ(self->comm, 1, "xs and ys must be same size");
  }

  Mat f_jx_ib;
  ierr = MatCreate(self->comm, &f_jx_ib); CHKERRQ(ierr);
  ierr = MatSetSizes(f_jx_ib, PETSC_DECIDE, PETSC_DECIDE, nx, nb); CHKERRQ(ierr);
  ierr = MatSetUp(f_jx_ib);               CHKERRQ(ierr);

  PetscScalar *x_ptr;
  VecGetArray(xs, &x_ptr);

  PetscReal *x_r_ptr; PetscMalloc1(nx, &x_r_ptr);
  for(int ix = 0; ix < nx; ix++)
    x_r_ptr[ix] = creal(x_ptr[ix]);

  PetscScalar *x_c_ptr; PetscMalloc1(nx, &x_c_ptr);
  ierr = CScalingCalc(self->c_scaling, x_r_ptr, nx, NULL, x_c_ptr); CHKERRQ(ierr);

  for(int jx = 0; jx < nx; jx++) {
    for(int ib = 0; ib < nb; ib++) {
      PetscScalar y;
      PetscBool zeroq;
      ierr = CalcBSpline(self->order, self->ts_r, self->ts_s, self->b_idx_list[ib],
			 x_r_ptr[jx], x_c_ptr[jx], &y, &zeroq); CHKERRQ(ierr);
      if(!zeroq) {
	ierr = MatSetValue(f_jx_ib, jx, ib, y, INSERT_VALUES); CHKERRQ(ierr);
      }
    }
  }  
  MatAssemblyBegin(f_jx_ib, MAT_FINAL_ASSEMBLY);
  MatAssemblyEnd(f_jx_ib, MAT_FINAL_ASSEMBLY);

  ierr = MatMult(f_jx_ib, c, ys); CHKERRQ(ierr);

  MatDestroy(&f_jx_ib);
  VecRestoreArray(xs, &x_ptr);
  PetscFree(x_r_ptr);
  PetscFree(x_c_ptr);
  return 0;
}
开发者ID:ReiMatsuzaki，项目名称:rescol，代码行数:55，代码来源:bspline.c


示例20: main

int main(int argc,char **args)
{
  Mat            C;
  Vec            u,x,b,e;
  PetscInt       i,n = 10,midx[3];
  PetscErrorCode ierr;
  PetscScalar    v[3];
  PetscReal      omega = 1.0,norm;

  PetscInitialize(&argc,&args,(char*)0,help);
  ierr = PetscOptionsGetReal(NULL,"-omega",&omega,NULL);CHKERRQ(ierr);
  ierr = PetscOptionsGetInt(NULL,"-n",&n,NULL);CHKERRQ(ierr);

  ierr = MatCreate(PETSC_COMM_SELF,&C);CHKERRQ(ierr);
  ierr = MatSetSizes(C,n,n,n,n);CHKERRQ(ierr);
  ierr = MatSetType(C,MATSEQDENSE);CHKERRQ(ierr);
  ierr = MatSetUp(C);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_SELF,n,&b);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_SELF,n,&x);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_SELF,n,&u);CHKERRQ(ierr);
  ierr = VecCreateSeq(PETSC_COMM_SELF,n,&e);CHKERRQ(ierr);
  ierr = VecSet(u,1.0);CHKERRQ(ierr);
  ierr = VecSet(x,0.0);CHKERRQ(ierr);

  v[0] = -1.; v[1] = 2.; v[2] = -1.;
  for (i=1; i<n-1; i++) {
    midx[0] = i-1; midx[1] = i; midx[2] = i+1;
    ierr    = MatSetValues(C,1,&i,3,midx,v,INSERT_VALUES);CHKERRQ(ierr);
  }
  i    = 0; midx[0] = 0; midx[1] = 1;
  v[0] = 2.0; v[1] = -1.;
  ierr = MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES);CHKERRQ(ierr);
  i    = n-1; midx[0] = n-2; midx[1] = n-1;
  v[0] = -1.0; v[1] = 2.;
  ierr = MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES);CHKERRQ(ierr);

  ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);

  ierr = MatMult(C,u,b);CHKERRQ(ierr);

  for (i=0; i<n; i++) {
    ierr = MatSOR(C,b,omega,SOR_FORWARD_SWEEP,0.0,1,1,x);CHKERRQ(ierr);
    ierr = VecWAXPY(e,-1.0,x,u);CHKERRQ(ierr);
    ierr = VecNorm(e,NORM_2,&norm);CHKERRQ(ierr);
    ierr = PetscPrintf(PETSC_COMM_SELF,"2-norm of error %g\n",(double)norm);CHKERRQ(ierr);
  }
  ierr = MatDestroy(&C);CHKERRQ(ierr);
  ierr = VecDestroy(&x);CHKERRQ(ierr);
  ierr = VecDestroy(&b);CHKERRQ(ierr);
  ierr = VecDestroy(&u);CHKERRQ(ierr);
  ierr = VecDestroy(&e);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return 0;
}
开发者ID:00liujj，项目名称:petsc，代码行数:55，代码来源:ex3.c



注：本文中的MatSetUp函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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