sort index ordering

[Paul Kienzle]

Hi! Does anyone know if sort is guaranteed to preserve relative index
order for identical sort values? 

E.g.,

        octave> [s,idx]=sort([1,2,3,1])
        s =

          1  1  2  3

        idx =

          1  4  2  3

        ^^^^^^^

The values in idx are increasing when the values in s are the same.  It
is true for the cases I've checked, but I want to be sure that it is
true in all cases, and that this characteristic will be preserved even
if the sort algorithm is changed.

Paul Kienzle
address@hidden



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