zcsgreconstructs the parameters (real) and (complex) of a complex plane rotation from the tangent of that rotation.
For full information please refer to the NAG Library document for f06cc
The value , the tangent of the rotation.
The value , the cosine of the rotation.
The value , the sine of the rotation.
No equivalent traditional C interface for this routine exists in the NAG Library.
zcsgreconstructs the parameters (real) and (complex) of a complex plane rotation, from the value of the tangent , as returned by
so that is always real and non-negative.
If , where is the machine precision, the function sets and .