[Boost-users] Matrix of submatricies...

From: Edward Grace (ej.grace_at_[hidden])
Date: 2005-09-15 07:06:58

Dear all,

[you may need a fixed with font]

Consider the following 4x4 matrix which is a 2x2 matrix of submatricies.

A B | 0 0 
C D | 0 0
----+----
0 0 | a b
0 0 | c d

Clearly matrix operations such as products do not need to involve the off 
diagonal (zero) sub matricies.  Is there a matrix type that "knows" about 
this type of matrix so that when prod() is carried out it does not do 
unnecessary operations with the zero elements?

-ed