There are two questions that I am interested in:

1) Suppose you have a sparse matrix

Code: Select all

A=[E F
   G H]


And you want to have access to the submatrices E,F,G,H without actually copying their content. Is there any way to do this as of now? This is especially important in memory intensive applications where we have a model matrix, A, and we for instance need to compute E^{-1}F, stored into a new matrix.

2) Is there a way to do it efficiently by copying?

EDIT: It is about sparse matrices.

no, that's currently not easily doable, but that will in the future.