NAME

crot - apply 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 CROT(
N, CX, INCX, CY, INCY, C, S )

INTEGER INCX, INCY, N

REAL C

COMPLEX S

COMPLEX CX( ∗ ), CY( ∗ )

PURPOSE

CROT   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 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 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) REAL

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

SunSoft, Inc.  —  Last change: 27 Jun 1995