Reference documentation for deal.II version 8.4.1

Auxiliary class aiding in the handling of block structures like in BlockVector or FESystem. More...
#include <deal.II/lac/block_indices.h>
Public Types  
typedef types::global_dof_index  size_type 
Public Member Functions  
BlockIndices ()  
BlockIndices (const std::vector< size_type > &block_sizes)  
BlockIndices (const unsigned int n_blocks, const size_type block_size=0)  
void  reinit (const unsigned int n_blocks, const size_type n_elements_per_block) 
void  reinit (const std::vector< size_type > &block_sizes) 
void  push_back (const size_type size) 
BlockIndices &  operator= (const BlockIndices &b) 
bool  operator== (const BlockIndices &b) const 
void  swap (BlockIndices &b) 
std::size_t  memory_consumption () const 
Size information  
unsigned int  size () const 
size_type  total_size () const 
size_type  block_size (const unsigned int i) const 
std::string  to_string () const 
Index conversion  
Functions in this group assume an object, which was created after sorting by block, such that each block forms a set of consecutive indices in the object. If applied to other objects, the numbers obtained from these functions are meaningless.  
std::pair< unsigned int, size_type >  global_to_local (const size_type i) const 
size_type  local_to_global (const unsigned int block, const size_type index) const 
size_type  block_start (const unsigned int i) const 
Public Member Functions inherited from Subscriptor  
Subscriptor ()  
Subscriptor (const Subscriptor &)  
virtual  ~Subscriptor () 
Subscriptor &  operator= (const Subscriptor &) 
void  subscribe (const char *identifier=0) const 
void  unsubscribe (const char *identifier=0) const 
unsigned int  n_subscriptions () const 
void  list_subscribers () const 
DeclException3 (ExcInUse, int, char *, std::string &,<< "Object of class "<< arg2<< " is still used by "<< arg1<< " other objects."<< "\n\n"<< "(Additional information: "<< arg3<< ")\n\n"<< "See the entry in the Frequently Asked Questions of "<< "deal.II (linked to from http://www.dealii.org/) for "<< "a lot more information on what this error means and "<< "how to fix programs in which it happens.")  
DeclException2 (ExcNoSubscriber, char *, char *,<< "No subscriber with identifier <"<< arg2<< "> subscribes to this object of class "<< arg1<< ". Consequently, it cannot be unsubscribed.")  
template<class Archive >  
void  serialize (Archive &ar, const unsigned int version) 
Private Attributes  
unsigned int  n_blocks 
std::vector< size_type >  start_indices 
Related Functions  
(Note that these are not member functions.)  
void  swap (BlockIndices &u, BlockIndices &v) 
Auxiliary class aiding in the handling of block structures like in BlockVector or FESystem.
The information obtained from this class falls into two groups. First, it is possible to obtain the number of blocks, namely size(), the block_size() for each block and the total_size() of the object described by the block indices, namely the length of the whole index set. These functions do not make any assumption on the ordering of the index set.
If on the other hand the index set is ordered "by blocks", such that each block forms a consecutive set of indices, this class that manages the conversion of global indices into a block vector or matrix to the local indices within this block. This is required, for example, when you address a global element in a block vector and want to know which element within which block this is. It is also useful if a matrix is composed of several blocks, where you have to translate global row and column indices to local ones.
Definition at line 54 of file block_indices.h.
Declare the type for container size.
Definition at line 60 of file block_indices.h.

inline 
Default constructor. Initialize for zero blocks.
Definition at line 254 of file block_indices.h.

inline 
Constructor. Initialize the number of entries in each block i
as block_sizes[i]
. The number of blocks will be the size of block_sizes
.
Definition at line 276 of file block_indices.h.

inlineexplicit 
Specialized constructor for a structure with blocks of equal size.
Definition at line 263 of file block_indices.h.

inline 
Reinitialize the number of blocks and assign each block the same number of elements.
Definition at line 227 of file block_indices.h.

inline 
Reinitialize the number of indices within each block from the given argument. The number of blocks will be adjusted to the size of block_sizes
and the size of block i
is set to block_sizes[i]
.
Definition at line 240 of file block_indices.h.

inline 
Add another block of given size to the end of the block structure.
Definition at line 287 of file block_indices.h.

inline 
Number of blocks in index field.
Definition at line 326 of file block_indices.h.

inline 
Return the total number of indices accumulated over all blocks, that is, the dimension of the vector space of the block vector.
Definition at line 335 of file block_indices.h.

inline 
The size of the ith
block.
Definition at line 345 of file block_indices.h.

inline 
String representation of the block sizes. The output is of the form [nb>b1,b2,b3s]
, where nb
is n_blocks(), s
is total_size() and b1
etc. are the values of block_size().
Definition at line 355 of file block_indices.h.

inline 
Return the block and the index within that block for the global index i
. The first element of the pair is the block, the second the index within it.
Definition at line 297 of file block_indices.h.

inline 
Return the global index of index
in block block
.
Definition at line 313 of file block_indices.h.

inline 
The start index of the ith block.
Definition at line 372 of file block_indices.h.

inline 
Copy operator.
Definition at line 382 of file block_indices.h.

inline 
Compare whether two objects are the same, i.e. whether the number of blocks and the sizes of all blocks are equal.
Definition at line 393 of file block_indices.h.

inline 
Swap the contents of these two objects.
Definition at line 409 of file block_indices.h.

inline 
Determine an estimate for the memory consumption (in bytes) of this object.
Definition at line 419 of file block_indices.h.

related 
Global function swap
which overloads the default implementation of the C++ standard library which uses a temporary object. The function simply exchanges the data of the two objects.
Definition at line 439 of file block_indices.h.

private 
Number of blocks. While this value could be obtained through start_indices.size()1
, we cache this value for faster access.
Definition at line 187 of file block_indices.h.

private 
Global starting index of each vector. The last and redundant value is the total number of entries.
Definition at line 193 of file block_indices.h.