Previous: clacpy Up: ../lapack-c.html Next: cladiv

# clacrt

```
NAME
CLACRT - apply a plane rotation, where the cos and sin (C
and S) are complex and the vectors CX and CY are complex

SYNOPSIS
SUBROUTINE CLACRT( N, CX, INCX, CY, INCY, C, S )

INTEGER        INCX, INCY, N

COMPLEX        C, S

COMPLEX        CX( * ), CY( * )

PURPOSE
CLACRT applies a plane rotation, where the cos and sin (C
and S) are 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 array, dimension (N)
On input, the vector X.  On output, CX is overwrit-
ten with C*X + S*Y.

INCX    (input) INTEGER
The increment between successive values of CY.  INCX
<> 0.

CY      (input/output) COMPLEX array, dimension (N)
On input, the vector Y.  On output, CY is overwrit-
ten with -S*X + C*Y.

INCY    (input) INTEGER
The increment between successive values of CY.  INCX
<> 0.

C       (input) COMPLEX
S       (input) COMPLEX C and S define a complex
rotation [  C   S  ] [ -S   C  ] where C*C + S*S =
1.0.
```