_ROT_(3F)_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.
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