F06BAF generates a real Givens plane rotation and the tangent of that rotation.
F06BAF generates a real Givens plane rotation with parameters
c (
≥0) and
s, such that, given real
a and
b:
On exit,
b is overwritten by
t, the tangent of the rotation;
c and
s can be reconstructed from the single stored value
t, by a subsequent call to
F06BCF.
To apply the plane rotation to a pair of real vectors, call
F06EPF (DROT); to apply it to a pair of complex vectors, call
F06KPF.
None.
None.
Not applicable.
None.
None.