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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),
10 // Department of Aeronautics, Imperial College London (UK), and Scientific
11 // Computing and Imaging Institute, University of Utah (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  m_crsData = 0;
58  }
59 
61  {
63  }
64 
65  /// Solve the linear system for given input and output vectors.
67  const int pNumRows,
68  const Array<OneD,const NekDouble> &pInput,
69  Array<OneD, NekDouble> &pOutput,
70  const AssemblyMapSharedPtr &pLocToGloMap,
71  const int pNumDir)
72  {
73  int nLocal = m_map.num_elements();
74  Array<OneD, NekDouble> vLocalIn(nLocal, 0.0);
75  Array<OneD, NekDouble> vLocalOut(nLocal, 0.0);
76  GlobalToLocalNoSign(pInput, vLocalIn);
77  Xxt::Solve(vLocalOut, m_crsData, vLocalIn);
78  LocalToGlobalNoSign(vLocalOut, pOutput);
79  }
80 
83  {
84  Vmath::Gathr(m_map.num_elements(), m_locToGloSignMult.get(), global.get(), m_map.get(), local.get());
85  }
86 
88  Array<OneD, NekDouble> &global)
89  {
90  Vmath::Scatr(m_map.num_elements(), local.get(), m_map.get(), global.get());
91  }
92 
93  }
94 }
95 
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:186
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:74
static void Finalise(crs_data *pCrs)
Deallocates the crs mapping data.
Definition: Xxt.hpp:202
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