SLARTG - generate a plane rotation so that  [ CS SN ]
SYNOPSIS
       SUBROUTINE SLARTG( F, G, CS, SN, R )
           REAL           CS, F, G, R, SN
PURPOSE
       SLARTG generate a plane rotation so that [ CS SN ] . [ F ]
       = [ R ] where CS**2 + SN**2 = 1.    [ -SN  CS  ]     [ G ]
       [ 0 ]
       This  is a slower, more accurate version of the BLAS1 rou
       tine SROTG, with the following other differences:
          F and G are unchanged on return.
          If G=0, then CS=1 and SN=0.
          If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing
       any
             floating point operations (saves work in SBDSQR when
             there are zeros on the diagonal).
       If F exceeds G in magnitude, CS will be positive.
ARGUMENTS
       F       (input) REAL
               The first component of vector to be rotated.
       G       (input) REAL
               The second component of vector to be rotated.
       CS      (output) REAL
               The cosine of the rotation.
       SN      (output) REAL
               The sine of the rotation.
       R       (output) REAL
               The nonzero component of the rotated vector.
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