ZDROT(3)
plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex
SYNOPSIS
- SUBROUTINE ZDROT(
-
N, CX, INCX, CY, INCY, C, S )
-
INTEGER
INCX, INCY, N
-
DOUBLE
PRECISION C, S
-
COMPLEX*16
CX( * ), CY( * )
PURPOSE
Applies a plane rotation, where the cos and sin (c and s) are real
and the vectors cx and cy are complex.
jack dongarra, linpack, 3/11/78.
ARGUMENTS
- N (input) INTEGER
-
On entry, N specifies the order of the vectors cx and cy.
N must be at least zero.
Unchanged on exit.
- CX (input) COMPLEX*16 array, dimension at least
-
( 1 + ( N - 1 )*abs( INCX ) ).
Before entry, the incremented array CX must contain the n
element vector cx. On exit, CX is overwritten by the updated
vector cx.
- INCX (input) INTEGER
-
On entry, INCX specifies the increment for the elements of
CX. INCX must not be zero.
Unchanged on exit.
- CY (input) COMPLEX*16 array, dimension at least
-
( 1 + ( N - 1 )*abs( INCY ) ).
Before entry, the incremented array CY must contain the n
element vector cy. On exit, CY is overwritten by the updated
vector cy.
- INCY (input) INTEGER
-
On entry, INCY specifies the increment for the elements of
CY. INCY must not be zero.
Unchanged on exit.
- C (input) DOUBLE PRECISION
-
On entry, C specifies the cosine, cos.
Unchanged on exit.
- S (input) DOUBLE PRECISION
-
On entry, S specifies the sine, sin.
Unchanged on exit.
