drot - Apply a Given's rotation constructed by SROTG.
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(*)
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
#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);
drot Apply a Given's rotation constructed by SROTG.
- 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)
( 1 + ( n - 1 )*abs( INCX ) ).
Before entry, the incremented array X must contain the
vector x.
Unchanged on exit.
- INCX (input)
On entry, INCX specifies the increment for the elements of
X. INCX must not be zero.
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. INCY must not be zero.
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.