# Pi

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### Pi

Type: double No

The constraint dual value in the current solution (also known as the shadow price).

Given a linear programming problem

and a corresponding dual problem

the Pi attribute returns .

Of course, not all models fit this canonical form. In general, dual values have the following properties:

• Dual values for constraints are .
• Dual values for constraints are .
• Dual values for constraints are unconstrained.
For models with a maximization sense, the senses of the dual values are reversed: the dual is for a constraint and for a constraint.

Only available for continuous models.

For examples of how to query or modify attributes, refer to our Attribute Examples.