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      subroutine  cscalf(n,ca,cx,incx)
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c
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c     scales a vector by a constant.
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c     jack dongarra, linpack,  3/11/78.
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c     modified 3/93 to return if incx .le. 0.
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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 ca,cx(*)
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      integer i,incx,n,nincx
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c
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      if( n.le.0 .or. incx.le.0 )return
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      if(incx.eq.1)go to 20
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c
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c        code for increment not equal to 1
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c
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      nincx = n*incx
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      do 10 i = 1,nincx,incx
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        cx(i) = ca*cx(i)
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   10 continue
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      return
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c
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c        code for increment equal to 1
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c
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   20 do 30 i = 1,n
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        cx(i) = ca*cx(i)
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   30 continue
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      return
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      end