F06CBF generates a complex Givens plane rotation having real sine.
F06CBF generates a complex Givens plane rotation with parameters
c (complex) and
s (real), such that, given complex
a and
b:
If
b is real, then
d is also real. 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
F06CDF.
Note that
t is always set to
b/a, unless overflow would occur, in which case the routine returns the value of the expression
flmax is the real value given by
1/X02AMF.
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Not applicable.
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