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ZDROT(1) ZDROT(1)

NAME

ZDROT - plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex

SYNOPSIS

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

On entry, N specifies the order of the vectors cx and cy. N must be at least zero. Unchanged on exit.
( 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.
On entry, INCX specifies the increment for the elements of CX. INCX must not be zero. Unchanged on exit.
( 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.
On entry, INCY specifies the increment for the elements of CY. INCY must not be zero. Unchanged on exit.
On entry, C specifies the cosine, cos. Unchanged on exit.
On entry, S specifies the sine, sin. Unchanged on exit.
October 2006