redhat man page for zlargv

ZLARGV(l)								 )								 ZLARGV(l)

NAME
       ZLARGV - generate a vector of complex plane rotations with real cosines, determined by elements of the complex vectors x and y

SYNOPSIS
       SUBROUTINE ZLARGV( N, X, INCX, Y, INCY, C, INCC )

	   INTEGER	  INCC, INCX, INCY, N

	   DOUBLE	  PRECISION C( * )

	   COMPLEX*16	  X( * ), Y( * )

PURPOSE
       ZLARGV  generates  a  vector  of  complex plane rotations with real cosines, determined by elements of the complex vectors x and y. For i =
       1,2,...,n

	  (	   c(i)   s(i) ) ( x(i) ) = ( r(i) )
	  ( -conjg(s(i))  c(i) ) ( y(i) ) = (	0  )

	  where c(i)**2 + ABS(s(i))**2 = 1

       The following conventions are used (these are the same as in ZLARTG, but differ from the BLAS1 routine ZROTG):
	  If y(i)=0, then c(i)=1 and s(i)=0.
	  If x(i)=0, then c(i)=0 and s(i) is chosen so that r(i) is real.

ARGUMENTS
       N       (input) INTEGER
	       The number of plane rotations to be generated.

       X       (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCX)
	       On entry, the vector x.	On exit, x(i) is overwritten by r(i), for i = 1,...,n.

       INCX    (input) INTEGER
	       The increment between elements of X. INCX > 0.

       Y       (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCY)
	       On entry, the vector y.	On exit, the sines of the plane rotations.

       INCY    (input) INTEGER
	       The increment between elements of Y. INCY > 0.

       C       (output) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
	       The cosines of the plane rotations.

       INCC    (input) INTEGER
	       The increment between elements of C. INCC > 0.

FURTHER DETAILS
       6-6-96 - Modified with a new algorithm by W. Kahan and J. Demmel

LAPACK version 3.0						   15 June 2000 							 ZLARGV(l)