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.SH NAME
ZDROT - applies a plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex.
.SH SYNOPSIS
.TP 18
SUBROUTINE ZDROT(
N, CX, INCX, CY, INCY, C, S )
.TP 18
.ti +4
INTEGER
INCX, INCY, N
.TP 18
.ti +4
DOUBLE
PRECISION C, S
.TP 18
.ti +4
COMPLEX*16
CX( * ), CY( * )
.TP 18
.ti +4
INTEGER
I, IX, IY
.TP 18
.ti +4
COMPLEX*16
CTEMP
.TP 18
.ti +4
IF(
N.LE.0 )
RETURN
.TP 18
.ti +4
IF(
INCX.EQ.1 .AND. INCY.EQ.1 )
GO TO 20
.TP 18
.ti +4
IX
= 1
.TP 18
.ti +4
IY
= 1
.TP 18
.ti +4
IF(
INCX.LT.0 )
IX = ( -N+1 )*INCX + 1
.TP 18
.ti +4
IF(
INCY.LT.0 )
IY = ( -N+1 )*INCY + 1
.TP 18
.ti +4
DO
10 I = 1, N
.TP 18
.ti +4
CTEMP
= C*CX( IX ) + S*CY( IY )
.TP 18
.ti +4
CY(
IY ) = C*CY( IY ) - S*CX( IX )
.TP 18
.ti +4
CX(
IX ) = CTEMP
.TP 18
.ti +4
IX
= IX + INCX
.TP 18
.ti +4
IY
= IY + INCY
.TP 18
.ti +4
10
CONTINUE
.TP 18
.ti +4
RETURN
.TP 18
.ti +4
20
CONTINUE
.TP 18
.ti +4
DO
30 I = 1, N
.TP 18
.ti +4
CTEMP
= C*CX( I ) + S*CY( I )
.TP 18
.ti +4
CY(
I ) = C*CY( I ) - S*CX( I )
.TP 18
.ti +4
CX(
I ) = CTEMP
.TP 18
.ti +4
30
CONTINUE
.TP 18
.ti +4
RETURN
.TP 18
.ti +4
END
.SH PURPOSE
|
