f11xsf computes the matrix-vector product
where
is an
complex Hermitian sparse matrix, of arbitrary sparsity pattern, stored in symmetric coordinate storage (SCS) format (see
Section 2.1.2 in the
F11 Chapter Introduction). The array
a stores all the nonzero elements in the lower triangular part of
, while arrays
irow and
icol store the corresponding row and column indices respectively.
None.
If on entry
or
, explanatory error messages are output on the current error message unit (as defined by
x04aaf).
The computed vector
satisfies the error bound
where
is a modest linear function of
, and
is the
machine precision.
Background information to multithreading can be found in the
Multithreading documentation.
Please consult the
X06 Chapter Introduction for information on how to control and interrogate the OpenMP environment used within this routine. Please also consult the
Users' Note for your implementation for any additional implementation-specific information.
The time taken for a call to
f11xsf is proportional to
nnz.