Sparse BLAS implements some operations for this type of matrix (look for zbdimm), although its interface is in C (no generic programming). Maybe someone could port those routines to uBlas. On 9/15/05, Edward Grace wrote:

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?

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