gams:error_set_used_in_ord_or_lag_is_not_ordered

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gams:error_set_used_in_ord_or_lag_is_not_ordered [2008/10/15 14:17] support |
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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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