NAME¶

ZROT - applies a plane rotation, where the cos (C) is real and the sin (S) is complex, and the vectors CX and CY are complex

SYNOPSIS¶

SUBROUTINE ZROT(

N, CX, INCX, CY, INCY, C, S )

INTEGER INCX, INCY, N DOUBLE PRECISION C COMPLEX*16 S COMPLEX*16 CX( * ), CY( * )

PURPOSE¶

ZROT applies a plane rotation, where the cos (C) is real and the sin (S) is complex, and the vectors CX and CY are complex.

ARGUMENTS¶

N (input) INTEGER

The number of elements in the vectors CX and CY.

CX (input/output) COMPLEX*16 array, dimension (N)

On input, the vector X. On output, CX is overwritten with C*X + S*Y.

INCX (input) INTEGER

The increment between successive values of CY. INCX <> 0.

CY (input/output) COMPLEX*16 array, dimension (N)

On input, the vector Y. On output, CY is overwritten with -CONJG(S)*X + C*Y.

INCY (input) INTEGER

The increment between successive values of CY. INCX <> 0.

C (input) DOUBLE PRECISION

S (input) COMPLEX*16 C and S define a rotation [ C S ] [ -conjg(S) C ] where C*C + S*CONJG(S) = 1.0.