subroutine indexx(n,arr,indx) parameter (NMAX=2000) integer indx(n) real arr(n) real brr(NMAX) if(n.gt.NMAX) then print*,'n=',n,' too big in indexx.' stop endif do i=1,n brr(i)=arr(i) indx(i)=i enddo call ssort(brr,indx,n,2) return end