[Octave-bug-tracker] [bug #41428] Add an &~ binary operator

[David Bateman]

Follow-up Comment #6, bug #41428 (project octave):

I'm not proposing to add the operators as that are already there. I believe
Micheal added them a couple of years ago. Look in ov.h(enum
compound_binary_ops). The operators

    op_trans_mul,
    op_mul_trans,
    op_herm_mul,
    op_mul_herm,
    op_trans_ldiv,
    op_herm_ldiv,
    op_el_not_and,
    op_el_not_or,
    op_el_and_not,
    op_el_or_not,
    num_compound_binary_ops,

are already defined and used for full matrices. I have a first try of the
operators op_el_not_and, op_el_not_or, op_el_and_not and op_el_or_not written
for scalar-sparse, sparse-scalar, full-sparse, sparse-full and sparse-sparse
with the exception of op_el_not_or and op_el_or_not for sparse-sparse binary
operators as I can't see a way of efficently implementing that.I just need to
debug it as it doesn't quite work yet ;-)

D.

PS: I was probably optomistic for the effort needed to implement the other
compound operators though UMFPACK and CHOLMOD seem to natively support the
transpose and hermitian version of the solvers



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