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dlartg examples
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Man Page Details
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NAME
       DLARTG - a plane rotation so that   [ CS SN ]

SYNOPSIS
       SUBROUTINE DLARTG( F, G, CS, SN, R )

           DOUBLE         PRECISION CS, F, G, R, SN

PURPOSE
       DLARTG generate a plane rotation so that
          [ -SN  CS  ]     [ G ]     [ 0 ]

       This  is  a  slower,  more accurate version of the BLAS1 routine DROTG,
       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 DBDSQR when
             there are zeros on the diagonal).

       If F exceeds G in magnitude, CS will be positive.


ARGUMENTS
       F       (input) DOUBLE PRECISION
               The first component of vector to be rotated.

       G       (input) DOUBLE PRECISION
               The second component of vector to be rotated.

       CS      (output) DOUBLE PRECISION
               The cosine of the rotation.

       SN      (output) DOUBLE PRECISION
               The sine of the rotation.

       R       (output) DOUBLE PRECISION
               The nonzero component of the rotated vector.

