man csrot (Fonctions bibliothèques) - applies a plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex.
NAME
CSROT - applies a plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex.
SYNOPSIS
- SUBROUTINE CSROT(
- N, CX, INCX, CY, INCY, C, S )
- INTEGER INCX, INCY, N
- REAL C, S
- COMPLEX CX( * ), CY( * )
- INTEGER I, IX, IY
- COMPLEX CTEMP
- IF( N.LE.0 ) RETURN
- IF( INCX.EQ.1 .AND. INCY.EQ.1 ) GO TO 20
- IX = 1
- IY = 1
- IF( INCX.LT.0 ) IX = ( -N+1 )*INCX + 1
- IF( INCY.LT.0 ) IY = ( -N+1 )*INCY + 1
- DO 10 I = 1, N
- CTEMP = C*CX( IX ) + S*CY( IY )
- CY( IY ) = C*CY( IY ) - S*CX( IX )
- CX( IX ) = CTEMP
- IX = IX + INCX
- IY = IY + INCY
- 10 CONTINUE
- RETURN
- 20 DO 30 I = 1, N
- CTEMP = C*CX( I ) + S*CY( I )
- CY( I ) = C*CY( I ) - S*CX( I )
- CX( I ) = CTEMP
- 30 CONTINUE
- RETURN
- END