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# zdrot

## man page of zdrot

### zdrot: plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex

```NAME
ZDROT  -  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.

October 2006                         ZDROT(3)
```