Dzasum Dznrm2 Zaxpy Zcopy Zdotc Zdotu Zdrot Zdscal Zrot Zrotg Zscal Zswap

Zrotg() Sub Zrotg ( ZA As  Complex, ZB As  Complex, C As  Double, ZS As  Complex  ) Constructs Givens plane rotation (complex vector) (BLAS 1) Purpose This routine constructs Givens plane rotation for the point (a, b) as below. ( c s ) * ( a ) = ( r ) (-conjg(s) c ) ( b ) ( 0 ) where r = (a/sqrt(conjg(a)*a))*sqrt(conjg(a)*a + conjg(b)*b), if |a| != 0, r = b, if |a| = 0. The constructed plane rotation can be used by Zrot to convert the points to the new coordinate system. Parameters [in,out] ZA [in] a value [out] r value [in] ZB b value. [out] C c (cosine) value. [out] ZS s (sine) value. Reference BLAS