NAME¶

ZDROT - ZDROT

總覽 SYNOPSIS¶

SUBROUTINE ZDROT(

N, CX, INCX, CY, INCY, C, S )

INTEGER

INCX, INCY, N

DOUBLE

PRECISION C, S

COMPLEX*16

CX( * ), CY( * )

INTEGER

I, IX, IY

COMPLEX*16

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

CONTINUE

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

PURPOSE¶

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