Reference documentation for deal.II version Git 35565f205e 20190924 08:33:37 +0200

#include <deal.II/lac/sparse_decomposition.h>
Public Member Functions  
AdditionalData (const double strengthen_diagonal=0, const unsigned int extra_off_diagonals=0, const bool use_previous_sparsity=false, const SparsityPattern *use_this_sparsity=nullptr)  
Public Attributes  
double  strengthen_diagonal 
unsigned int  extra_off_diagonals 
bool  use_previous_sparsity 
const SparsityPattern *  use_this_sparsity 
Parameters for SparseDecomposition.
Definition at line 144 of file sparse_decomposition.h.
SparseLUDecomposition< number >::AdditionalData::AdditionalData  (  const double  strengthen_diagonal = 0 , 
const unsigned int  extra_off_diagonals = 0 , 

const bool  use_previous_sparsity = false , 

const SparsityPattern *  use_this_sparsity = nullptr 

) 
Constructor. For the parameters' description, see below.
double SparseLUDecomposition< number >::AdditionalData::strengthen_diagonal 
strengthen_diag
times the sum of absolute row entries is added to the diagonal entries.
Per default, this value is zero, i.e. the diagonal is not strengthened.
Definition at line 161 of file sparse_decomposition.h.
unsigned int SparseLUDecomposition< number >::AdditionalData::extra_off_diagonals 
By default, the initialize(matrix, data)
function creates its own sparsity. This sparsity has the same SparsityPattern as matrix
with some extra off diagonals the number of which is specified by extra_off_diagonals
.
The user can give a SparsityPattern to use_this_sparsity
. Then this sparsity is used and the extra_off_diagonals
argument is ignored.
Definition at line 173 of file sparse_decomposition.h.
bool SparseLUDecomposition< number >::AdditionalData::use_previous_sparsity 
If this flag is true the initialize() function uses the same sparsity that was used during the previous initialize() call.
This might be useful when several linear problems on the same sparsity need to solved, as for example several Newton iteration steps on the same triangulation.
Definition at line 183 of file sparse_decomposition.h.
const SparsityPattern* SparseLUDecomposition< number >::AdditionalData::use_this_sparsity 
When a SparsityPattern is given to this argument, the initialize() function calls reinit(*use_this_sparsity)
causing this sparsity to be used.
Note that the sparsity structures of *use_this_sparsity
and the matrix passed to the initialize function need not be equal. Fillin is allowed, as well as filtering out some elements in the matrix.
Definition at line 195 of file sparse_decomposition.h.