Nektar++
GlobalLinSysXxt.cpp
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2 //
3 // File GlobalLinSysXxt.cpp
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9 // Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
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31 //
32 // Description: GlobalLinSysXxt definition
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
38 
39 namespace Nektar
40 {
41  namespace MultiRegions
42  {
43  /**
44  * @class GlobalLinSysXxt
45  *
46  * Solves a linear system using direct methods.
47  */
48 
49  /// Constructor for full direct matrix solve.
51  const GlobalLinSysKey &pKey,
52  const boost::weak_ptr<ExpList> &pExp,
53  const boost::shared_ptr<AssemblyMap>
54  &pLocToGloMap)
55  : GlobalLinSys(pKey, pExp, pLocToGloMap)
56  {
57  }
58 
60  {
62  }
63 
64  /// Solve the linear system for given input and output vectors.
66  const int pNumRows,
67  const Array<OneD,const NekDouble> &pInput,
68  Array<OneD, NekDouble> &pOutput,
69  const AssemblyMapSharedPtr &pLocToGloMap,
70  const int pNumDir)
71  {
72  int nLocal = m_map.num_elements();
73  Array<OneD, NekDouble> vLocalIn(nLocal, 0.0);
74  Array<OneD, NekDouble> vLocalOut(nLocal, 0.0);
75  GlobalToLocalNoSign(pInput, vLocalIn);
76  Xxt::Solve(vLocalOut, m_crsData, vLocalIn);
77  LocalToGlobalNoSign(vLocalOut, pOutput);
78  }
79 
82  {
83  Vmath::Gathr(m_map.num_elements(), m_locToGloSignMult.get(), global.get(), m_map.get(), local.get());
84  }
85 
87  Array<OneD, NekDouble> &global)
88  {
89  Vmath::Scatr(m_map.num_elements(), local.get(), m_map.get(), global.get());
90  }
91 
92  }
93 }
94 
void Gathr(int n, const T *x, const int *y, T *z)
Gather vector z[i] = x[y[i]].
Definition: Vmath.cpp:630
boost::shared_ptr< AssemblyMap > AssemblyMapSharedPtr
Definition: AssemblyMap.h:53
void LocalToGlobalNoSign(const Array< OneD, const NekDouble > &local, Array< OneD, NekDouble > &global)
static void Solve(Nektar::Array< OneD, NekDouble > pX, struct crs_data *pCrs, Nektar::Array< OneD, NekDouble > pB)
Solve the matrix system for a given input vector b.
Definition: Xxt.hpp:182
void Scatr(int n, const T *x, const int *y, T *z)
Scatter vector z[y[i]] = x[i].
Definition: Vmath.cpp:659
Describe a linear system.
void GlobalToLocalNoSign(const Array< OneD, const NekDouble > &global, Array< OneD, NekDouble > &local)
A global linear system.
Definition: GlobalLinSys.h:70
static void Finalise(crs_data *pCrs)
Deallocates the crs mapping data.
Definition: Xxt.hpp:198
virtual void v_SolveLinearSystem(const int pNumRows, const Array< OneD, const NekDouble > &pInput, Array< OneD, NekDouble > &pOutput, const AssemblyMapSharedPtr &locToGloMap, const int pNumDir=0)
Solve the linear system for given input and output vectors.
GlobalLinSysXxt(const GlobalLinSysKey &pKey, const boost::weak_ptr< ExpList > &pExp, const boost::shared_ptr< AssemblyMap > &pLocToGloMap)
Constructor for full direct matrix solve.
Array< OneD, NekDouble > m_locToGloSignMult