dcsgreconstructs the parameters and of a real plane rotation from the tangent of that rotation.
For full information please refer to the NAG Library document for f06bc
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.
dcsgreconstructs the parameters and of a real plane rotation from the value of the tangent , as returned by
so that and has the same sign as .
If , where is the machine precision, the function sets and ; if , the function sets and .