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      integer function idminf(n,dx,incx)
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c
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c     finds the index of element having min. value.
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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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      double precision dx(*),dmin
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      integer i,incx,ix,n
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c
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      idminf = 0
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      if( n.lt.1 .or. incx.le.0 ) return
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      idminf = 1
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      if(n.eq.1)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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      ix = 1
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      dmin = dx(1)
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      ix = ix + incx
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      do 10 i = 2,n
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         if(dx(ix).ge.dmin) go to 5
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         idminf = i
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         dmin = dx(ix)
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    5    ix = ix + incx
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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 dmin = dx(1)
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      do 30 i = 2,n
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         if(dx(i).ge.dmin) go to 30
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         idminf = i
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         dmin = dx(i)
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   30 continue
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      return
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      end