generates details of a real elementary reflection (Householder matrix),
, such that
are real scalars, and
-element real vector.
is such that
is the machine precision
is a user-supplied tolerance, then
is set to
can be taken to be the unit matrix. Otherwise
Background information to multithreading can be found in the Multithreading
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.