F06FJF updates the Euclidean norm of real vector in scaled form.
-element real vector
, and real scalars
returns updated values
F06FJF is designed for use in the safe computation of the
Euclidean norm of a real vector, without unnecessary overflow or destructive underflow. An initial call to F06FJF
may be followed by further calls to F06FJF and finally a call to F06BMF
to complete the computation. Multiple calls of F06FJF may be needed if the elements of the vector cannot all be accessed in a single array X