1      subroutine zaxpy(n,za,zx,incx,zy,incy)
2c
3c     constant times a vector plus a vector.
4c     jack dongarra, 3/11/78.
5c     modified 12/3/93, array(1) declarations changed to array(*)
6c
7      double complex zx(*),zy(*),za
8      integer i,incx,incy,ix,iy,n
9      double precision dcabs1
10      if(n.le.0)return
11      if (dcabs1(za) .eq. 0.0d0) return
12      if (incx.eq.1.and.incy.eq.1)go to 20
13c
14c        code for unequal increments or equal increments
15c          not equal to 1
16c
17      ix = 1
18      iy = 1
19      if(incx.lt.0)ix = (-n+1)*incx + 1
20      if(incy.lt.0)iy = (-n+1)*incy + 1
21      do 10 i = 1,n
22        zy(iy) = zy(iy) + za*zx(ix)
23        ix = ix + incx
24        iy = iy + incy
25   10 continue
26      return
27c
28c        code for both increments equal to 1
29c
30   20 do 30 i = 1,n
31        zy(i) = zy(i) + za*zx(i)
32   30 continue
33      return
34      end
35