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--- gams:error_set_used_in_ord_or_lag_is_not_ordered [2008/10/15 14:17]
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-====== Error: Set used in 'ord' or lag is not ordered. ======
-The ordering properties of a set can depend on the data in the set, and not on use.  I am attaching an example, with comments, that should make this clear. Note: The functions ''sameas'', ''.pos'', and ''.val'' will also work, if the set is not ordered.
-<code>
-* $ontext
-* Here, the set 'big' is not ordered; this is because the
-* elements in it have already appeared (in the sets even and odd),
-* but appeared in the order 0, 2, 4, 1, 3, 5,
-* not 0, 1, 2, 3, 4, 5
-* Thus you will get an error message with the code below:
-* 198   Set used in 'ord' or lag is not ordered.
-*         Hint: Some of the elements of the set were used before this
-*         was initialized and the order was different from the order used
-*         in this set. Try to initialize the set earlier.
-SETS
-  even  / 0, 2, 4 /,
-  odd   / 1, 3, 5 /,
-  big   / 0 * 5 /;
-* $offtext
-$ontext
-* Here, the set 'big' is ordered
-* and the elements in even and odd occur in this same order,
-* so they are ordered as well.
-SETS
-  big   / 0 * 5 /,
-  even  / 0, 2, 4 /,
-  odd   / 1, 3, 5 /;
-$offtext
-parameter oo(big);
-oo(big) = ord(big);
-display oo;
-</code>

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