20
Recursive Factorizations
¨Larger matrix-matrix operations performed
¨Automatic Blocking
ãDrive the recursion down to 1
ãNo blocksize needed
¨Applies to Cholesky and QR factorization
ãQR needs some care because of
triangular matrix in block Householder
¨Unclear if ideas applies to 2-sided algorithms (reduction for eigenvalue problem)