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struct btd

The structure variable btd of type block_tri_diag holds the block-tri-diagonal matrix B in (1.91). The structure type block_tri_diag is defined in the module mathlib1.c and if we assume N blocks of size (I_block x I_block) it has the following form

e

Description

l

Block-diagonal (main diagonal) matrix of order (N x (I_block x I_block)) arranged as a N dimensional vector of (I_block x I_block) order matrices.

l

Upper block-diagonal of order ((N-1) x (I_block x I_block)). Since the block-matrices are diagonal matrices we only store the diagonal entries. Hence the upper block-diagonal is stored as a (N-1) order vector of diagonal matrices (= vectors) of order I_block.

Note that we in our case do not need to store the lower block-diagonal matrix (see (1.75)).

 
 

 
 

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