A method (and structure) of linear algebra processing, includes processing a (real or complex) matrix data having elements originally stored in one of a triangular format and a symmetric matrix format in a subroutine designed to process matrix data in a full format. The processing uses a hybrid full packed data structure, which provides a rectangular space characteristic of the full format. The rectangular space is defined by a leading dimension (LD). Inside of the rectangular space are stored a plurality of entities that include all elements of the matrix data originally stored in the triangular or symmetric format.
U.S. GOVERNMENT RIGHTS IN THE INVENTION
 This invention was made with Government support under Contract No. Blue Gene/L B517552 awarded by the Department of Energy. The Government has certain rights in this invention.