NAME¶

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

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.