subroutine zaxpy	(	integer	N,
		complex*16	ZA,
		complex*16, dimension(*)	ZX,
		integer	INCX,
		complex*16, dimension(*)	ZY,
		integer	INCY
	)

ZAXPY

Purpose:

    ZAXPY constant times a vector plus a vector.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date

November 2011

Further Details:

     jack dongarra, 3/11/78.
     modified 12/3/93, array(1) declarations changed to array(*)

Definition at line 53 of file zaxpy.f.

*
*  -- Reference BLAS level1 routine (version 3.4.0) --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2011
*
*     .. Scalar Arguments ..
      COMPLEX*16 za
      INTEGER incx,incy,n
*     ..
*     .. Array Arguments ..
      COMPLEX*16 zx(*),zy(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER i,ix,iy
*     ..
*     .. External Functions ..
      DOUBLE PRECISION dcabs1
      EXTERNAL dcabs1
*     ..
      IF (n.LE.0) RETURN
      IF (dcabs1(za).EQ.0.0d0) RETURN
      IF (incx.EQ.1 .AND. incy.EQ.1) THEN
*
*        code for both increments equal to 1
*
         DO i = 1,n
            zy(i) = zy(i) + za*zx(i)
         END DO
      ELSE
*
*        code for unequal increments or equal increments
*          not equal to 1
*
         ix = 1
         iy = 1
         IF (incx.LT.0) ix = (-n+1)*incx + 1
         IF (incy.LT.0) iy = (-n+1)*incy + 1
         DO i = 1,n
            zy(iy) = zy(iy) + za*zx(ix)
            ix = ix + incx
            iy = iy + incy
         END DO
      END IF
*
      RETURN