rot(3F)

NAME
     drotg, srotg, drot, srot - BLAS level ONE rotation subroutines

SYNOPSIS
     subroutine drotg( da, db, c, s )
     double precision  c, da, db, s

     subroutine srotg( sa, sb, c, s )
     real              c, s, sa, sb

     subroutine drot( n, dx, incx, dy, incy, c, s )
     integer          incx, incy, n
     double precision c, s
     double precision dx( 1 ), dy( 1 )

     subroutine srot( n, sx, incx, sy, incy, c, s )
     integer          incx, incy, n
     real             c, s
     real             sx( 1 ), sy( 1 )

DESCRIPTION
     DROTG and SROTG compute C and S, the Cosine and Sine of the rotation,
     given the coordinates of a transformed vector (da, db) or (sa, sb).

     DROT and SROT apply a plane rotation (Cosine = C, Sine = S) to N points
     whose coordinates are defined by the DX (SX) and DY (SY) vectors.

AUTHORS
          Jack Dongarra, linpack, 3/11/78.