ZROT(3)
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.
