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sort ordering



I'm confused by the following behavior:


> IDL> print,stations[0:9]
> S301 S301 S301 S301 S301 S301 S301 S301 S301 S301
> IDL> print,sort(stations[0:9])
>       5   1   2   3   4   0   6   7   8   9
>

If the elements of certain part of an array are identical, why does IDL
not generate sort indices in ascending order?  This has ugly
implications for some programs I am writing.  Thanks,

Med Bennett