DragonFly On-Line Manual Pages

zlartg.f(3)                         LAPACK                         zlartg.f(3)

NAME
       zlartg.f -

SYNOPSIS
   Functions/Subroutines
       subroutine zlartg (F, G, CS, SN, R)
           ZLARTG generates a plane rotation with real cosine and complex
           sine.

Function/Subroutine Documentation
   subroutine zlartg (complex*16F, complex*16G, double precisionCS,
       complex*16SN, complex*16R)
       ZLARTG generates a plane rotation with real cosine and complex sine.

       Purpose:

            ZLARTG generates a plane rotation so that

               [  CS  SN  ]     [ F ]     [ R ]
               [  __      ]  .  [   ]  =  [   ]   where CS**2 + |SN|**2 = 1.
               [ -SN  CS  ]     [ G ]     [ 0 ]

            This is a faster version of the BLAS1 routine ZROTG, except for
            the following differences:
               F and G are unchanged on return.
               If G=0, then CS=1 and SN=0.
               If F=0, then CS=0 and SN is chosen so that R is real.

       Parameters:
           F

                     F is COMPLEX*16
                     The first component of vector to be rotated.

           G

                     G is COMPLEX*16
                     The second component of vector to be rotated.

           CS

                     CS is DOUBLE PRECISION
                     The cosine of the rotation.

           SN

                     SN is COMPLEX*16
                     The sine of the rotation.

           R

                     R is COMPLEX*16
                     The nonzero component of the rotated vector.

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           November 2013

       Further Details:

             3-5-96 - 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.

       Definition at line 104 of file zlartg.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2                   Sat Nov 16 2013                    zlartg.f(3)