drot(3P) Sun Performance Library drot(3P)NAMEdrot - Apply a Given's rotation constructed by SROTG.
SYNOPSIS
SUBROUTINE DROT(N, X, INCX, Y, INCY, C, S)
INTEGER N, INCX, INCY
DOUBLE PRECISION C, S
DOUBLE PRECISION X(*), Y(*)
SUBROUTINE DROT_64(N, X, INCX, Y, INCY, C, S)
INTEGER*8 N, INCX, INCY
DOUBLE PRECISION C, S
DOUBLE PRECISION X(*), Y(*)
F95 INTERFACE
SUBROUTINE ROT([N], X, [INCX], Y, [INCY], C, S)
INTEGER :: N, INCX, INCY
REAL(8) :: C, S
REAL(8), DIMENSION(:) :: X, Y
SUBROUTINE ROT_64([N], X, [INCX], Y, [INCY], C, S)
INTEGER(8) :: N, INCX, INCY
REAL(8) :: C, S
REAL(8), DIMENSION(:) :: X, Y
C INTERFACE
#include <sunperf.h>
void drot(int n, double *x, int incx, double *y, int incy, double c,
double s);
void drot_64(long n, double *x, long incx, double *y, long incy, double
c, double s);
PURPOSEdrot Apply a Given's rotation constructed by SROTG.
ARGUMENTS
N (input)
On entry, N specifies the number of elements in the vector.
N must be at least one for the subroutine to have any visible
effect. Unchanged on exit.
X (input/output)
( 1 + ( N - 1 )*abs( INCX ) ). On entry, the incremented
array X must contain the vector x. On exit, X is overwritten
by the updated vector x.
INCX (input)
On entry, INCX specifies the increment for the elements of X.
Unchanged on exit.
Y (input/output)
( 1 + ( N - 1 )*abs( INCY ) ). On entry, the incremented
array Y must contain the vector y. On exit, Y is overwritten
by the updated vector y.
INCY (input)
On entry, INCY specifies the increment for the elements of Y.
Unchanged on exit.
C (input) On entry, the C rotation value constructed by SROTG.
Unchanged on exit.
S (input) On entry, the S rotation value constructed by SROTG.
Unchanged on exit.
6 Mar 2009 drot(3P)
