On entry: arrays
irowh and
icolh store the nonzeros of the upper triangle of the matrix
in coordinate storage (CS) format (see
Section 2.1.1 in the f11 Chapter Introduction).
irowh specifies one-based row indices,
icolh specifies one-based column indices and specifies the values of the nonzero elements in such a way that
where
and
, for
. No particular order is expected, but elements should not repeat.