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      subroutine caxpyf(n,ca,cx,incx,cy,incy)
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c
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c     constant times a vector plus a vector.
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c     jack dongarra, linpack, 3/11/78.
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c     modified 12/3/93, array(1) declarations changed to array(*)
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c
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      complex cx(*),cy(*),ca
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      integer i,incx,incy,ix,iy,n
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c
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      if(n.le.0)return
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      if (abs(real(ca)) + abs(aimag(ca)) .eq. 0.0 ) return
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      if(incx.eq.1.and.incy.eq.1)go to 20
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c
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c        code for unequal increments or equal increments
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c          not equal to 1
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c
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      ix = 1
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      iy = 1
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      if(incx.lt.0)ix = (-n+1)*incx + 1
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      if(incy.lt.0)iy = (-n+1)*incy + 1
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      do 10 i = 1,n
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        cy(iy) = cy(iy) + ca*cx(ix)
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        ix = ix + incx
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        iy = iy + incy
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   10 continue
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      return
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c
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c        code for both increments equal to 1
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c
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   20 do 30 i = 1,n
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        cy(i) = cy(i) + ca*cx(i)
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   30 continue
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      return
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      end