CLARGV 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 CLARTG,


 but differ from the BLAS1 routine CROTG):


    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.

N

          N is INTEGER


          The number of plane rotations to be generated.

X

          X is COMPLEX 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

          INCX is INTEGER


          The increment between elements of X. INCX > 0.

Y

          Y is COMPLEX array, dimension (1+(N-1)*INCY)


          On entry, the vector y.


          On exit, the sines of the plane rotations.

INCY

          INCY is INTEGER


          The increment between elements of Y. INCY > 0.

C

          C is REAL array, dimension (1+(N-1)*INCC)


          The cosines of the plane rotations.

INCC

          INCC is INTEGER


          The increment between elements of C. INCC > 0.

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

December 2016

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


  This version has a few statements commented out for thread safety


  (machine parameters are computed on each entry). 10 feb 03, SJH.