On Jun 12, 3:14 pm, Hans Mittelmann <
mittelm...@...> wrote:
> I have a single-index parameter of real numbers of length n and want
> to generate another parameter of integers recording the reverse order
> of the elements in the first parameter,
> so smallest number gets a 1 in the new parameter and largest an n.
Can't swear this is the fastest, but it works assuming that there are
no ties.
param x {1..n}; # original data
param r {1..n} integer ; # ranks
set X ordered by interval (-Infinity, Infinity);
let X := setof {i in 1..n} x[i];
let {i in 1..n} r[i] := ord(x[i], X);
/Paul
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