HP MLIB User's Guide Vol. 1 7th Ed.

424 HP MLIB User’s Guide
What you need to know to use these subprograms
The next three letters in the naming convention, YYY, indicate the data
structure of the sparse matrix, as presented in Table 4-2.
Table 4-2 Sparse BLAS Naming Convention—Matrix Form
The table below lists the final two characters in the naming convention, ZZ,
indicating the type of operation.
Sparse BLAS Naming Convention—Operation
Sparse matrix storage formats
Each Sparse BLAS subroutine handles a specific sparse matrix storage format.
These formats are classified into two major groups: point entry and block entry
data structures, as presented in Table 4-2. Point entry formats store the
nonzero entries and keep track of their location in the matrix. Block entry
formats represent sparse matrices whose nonzero entries are dense blocks.
YYY Point Entry
COO Coordinate
CSC Compressed sparse column
MSC Modified sparse column
CSR Compressed sparse row
MSR Modified sparse row
DIA Sparse diagonal
ELL Ellpack-Itpack
JAD Jagged diagonal
SKY (Triangular) Skyline
YYY Block Entry
BCO Block coordinate
BSC Block compressed sparse column
BMC Block modified sparse column
BSR Block compressed sparse row
BMR Block modified sparse row
BDI Block sparse diagonal
BEL Block Ellpack-Itpack
VBR Variable block row
ZZ Subroutine Operation
MM Matrix-Matrix product
SM
Solution of a triangular system with mulitple
right-hand-sides