Returns the slack, or surplus, values for the constraints at the optimal solution. «opt» is a problem specified by DefineOptimization.
As an example, consider the following example constraint:
5 x1 + 3 x2 - x3 <= 14
Suppose the optimal solution is found at
(1, 2, 3). Then the left-hand side of this constraint at the optimum is 8. The slack, therefore, is 14 - 8 = 6. In other words, the right-hand side coefficient could be decreased by 6 units before the optimal solution would be impacted.
A slack of zero indicates that the constraint is one that is actively constraining the optimal solution.
This function was introduced in Analytica 4.3. Prior to Analytica 4.3, it was named LpSlack.
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