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.